Electricity Saving Tips For Homes And Offices

Choose the right sized water heater/geyser for electricity saving

By on April 22, 2016
Hindi Translation: बिजली की बचत के लिए सही आकार के वॉटर हीटर/गीजर का चुनाव

Planning to buy a new water heater/geyser and confused with the options available and sizes available? If yes then you are not alone, there are many people who face the same situation while buying a water heater. While buying a water heater one has to make sure that it not just suffices the need of the family but also does not increase electricity bills (or units consumed) significantly. People might look at the wattage of the water heater to determine the amount of electricity the water heater might use, but wattage does not have any impact on the electricity consumption of water heater. We will try to list some facts that can help you decide on the size and type of water heater.

What factors does electricity consumption of water heater/geyser depend on?

Electricity consumption of water heater depends on:

  • Volume of Hot Water used: This is the main driving factor of electricity consumption by water heaters. The more the hot water you use, the more the electricity it will consume.
  • Tap (Input) water temperature: Places with colder climates need lot more heating than places with warmer climates. A water heater in Kashmir will require lot more electricity than a water heater in Tamil Nadu.
  • Temperature of water used for bathing: Please note that this is different from thermostat temperature.
  • Thermostat temperature: This is by default set to about 60oC for most water heaters. Some heaters have external control to change this setting.
  • Standing Losses: Yes, water heaters do lose heat and this is calculated as standing loss. It is the heat lost through the surface of the water heater. BEE defines standing losses as the energy consumption of a filled water heater, after steady state conditions have been reached when connected to electrical supply, when no water is drawn. Much of this depends on the quality of material used for making the water heater. Branded water heaters are of better quality and thus they are preferred. BEE also rates only the branded water heaters.

How much water is required for my family?

A very straightforward guideline for the same is as mentioned below:

  • For bathing using bucket water: 15 lts/person per bath (one bucket). If more buckets of water are used, then add 15 lts/bucket.
  • For bathing using shower: 25 lts/person per bath.
  • For tub bath or extended shower bath: 35 lts/person per bath.
  • For washing cloths: 10 lts/person per day.
  • For washing utensils: 5 lts/person per meal.

(Source: http://www.teriin.org/ResUpdate/reep/ch_9.pdf)

So if there are 4 people in the household and all 4 take shower bath. Then the total hot water requirement per day of the household is 100 lts. Keep adding the water per use as per the guidelines above and you will get the water requirement of your house.

What is the ideal temperature for bathing?

Although most water heaters have a thermostat setting of 60oC, which means that, the water is heated up to 60oC but can human body handle water at 60oC? The answer is NO. Water at 60oC is too dangerous for human body and can cause first-degree burns. Human body temperature is 37oC and any temperature above it feels hot. A temperature of 46oC is quite hot but far less dangerous than water at 60oC. So even though your water heater heats the water to 60oC, you need to add extra cold water to make it bearable.

(Source: http://www.telegraph.co.uk/health/3318578/So-Mr-Prescott-how-hot-should-my-bath-be.html)

So what is the ideal Electricity Units that are required by your family?

Heating of water is a classic thermodynamics problem and has a straight forward formula:

Heat required = M (Mass of water) x Cp (Specific heat of water) x delta T (Difference in starting temperature and desired temperature).

A simplified solution to calculate electricity units is:

                                    Ideal Units for heating = Volume of Water x Temperature Difference x 0.0012

So if your family’s water requirement is 100 lts of hot water per day and you prefer to use water at 40oC and your tap water temperature is 20oC. Then the ideal units for your water heating requirement is:

                                    100 x (40-20) x 0.0012 = 2.4 units per day.

Will all water heaters consume ideal units of electricity?

No. The amount we calculated above is the ideal units and not the actual units. The actual units depend on the size of water heater, standing losses and the way you use it. The bigger the size of a water heater higher are the standing losses, because more is the surface area. Typical 100 lts water heaters have standing losses of more than 1 unit/day, 70 lts water heater is close to 0.9 units/day, and it decreases as the size decreases.

If you leave the water heater on throughout the day then you certainly loose the full standing loss units in a day. The way to minimize it is by heating the appropriate amount of water that is required which can be done by switching the water heater on before use and switch it off after use. This way the standing losses will be minimized to the period when water heater is used. Also do not waste any extra hot water because that is waste of electricity.

So does it mean that you should buy smallest volume water heater?

Depends. If the water heater is too small then the amount of hot water (even if it is at 60oC) will not suffice the need of single person (even after adding cold water). You will have to wait for longer for the water heater to heat the desired amount of water or keep the output flow of water from the heater low.

So what is the ideal size?

Ideal size of water heater should be close to the volume of hot water required at one go. If people take bath one by one and use 25 lts of water, then a 25 lts or a 15 lts of water heater will make sure that the water is optimum hot when one goes to take bath (at places where tap water temperature is not too low). If the tap water temperature is too low (especially in cold places) only a 25 lts capacity hot water will work if 25 lts of water is required for a bath. If water heater is connected to 2 bathrooms then ideal size is 25 + 25 = 50 lts, because 50 lts of water can be used simultaneously. This does not mean that 6 lts water heater will not suffice; it’s just that it will take more time to heat the same amount of water or you might have to bear with cold water at the end of your bath. Ideal sizes are those that generate enough heat that are good for maximum instantaneous use.

How does the wattage of water heater effect?

Wattage of water heater makes the water heat faster or slower. If you buy an instant water heater of 4.5 kW the water will heat faster than a water heater of 2 kW. At times a 4.5 kW instant water heater can also heat the water required for bathing and can save electricity (by stopping wastage of extra hot water). The only downside of 4.5 kW water heater is that it increases the electricity load of your house which means that you connected load will have to be increased which may increase the fixed charge component of your electricity bill.Infographic11

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  • Kasturi

    Hi Abhishek
    We have 2 bathrooms connected to 1 water heater point. N we have 2 family member using shower so what qty of storage water heater is right for us in terms of saving electricity n also what brand ..Please advice.

    • https://www.bijlibachao.com Abhishek Jain

      A 35 lts water heater should be good for you. You can look at these models:

      AO Smith HSE-VAS-035
      Morphy Richards LAVO DIGI35 or LAVO EM35
      Havells MONZA EC 35 or MONZA TURBO 35

  • dev

    Hi abhishek
    we taking bucket bath, would you please suggest which one water heater is good for use , electricity or gas for saving purpose .

    thanks

  • Srikanth

    I have 2 toilet in the apartment, 5 people will be using it ( with or without shower ), can say how many liter of water heater required, what will be usage of electricity , Can u refer which company deals efficiency of water hear.

  • Mayukh Ghosh

    Hi I have a house connection load of 3KW is it fine if I install a 2000W -15 liter geyser

    • https://www.bijlibachao.com Abhishek Jain

      You will have to make sure that your total load running at any given time does not exceed 3 kW. Otherwise adding 2 KW geyser should not be a problem if your connected load is 3 kW.

  • Mahadev

    Hi abhishek, I am staying in Pune , we are 3 adults +2 kids , we generally taking bucket bath. the gap between 2 persons bath is around 5-10 mnts so would you please suggest which gyeser or water heater we want to use, and also save electricity point of view…plz suggest thanks,Mahadev

  • syed khureshi

    what is the ideal brand for borewell water bathing and for family of 4 what should be the size of geyser

    • https://www.bijlibachao.com Abhishek Jain

      Racold, AO Smith, Havells, Bajaj, Ferroli, Morphy Richards, Venus all have good corrosion protection. You can go for anyone of them.

    • https://www.bijlibachao.com Abhishek Jain

      For Bucket bath 10 lts water heater is good and for shower 15 lts is good.

  • Bharath Babu

    Dear Abhishek, I have Ferroli Calda 15. We knew the water heater stops heating when it reaches set temperature (thermostat) and re-start when the heater loses temperature. I want to know how many degrees of temperature drop is required to re-start heating. Please try to get the answer

    • https://www.bijlibachao.com Abhishek Jain

      Typically thermostats cycle on differential of 1 degree (source: http://www.explainthatstuff.com/thermostats.html ), but then there are thermostats available with adjustable differential as well. Truly depends on what the company has used.

  • Ahmed

    Hi there!
    I am the only one who will use geyser for shower bath. Which brand and capacity would you recommend for low energy consumption and long run usage? Could the same be also used for 2 adults in family, if not one? also, can geysers have settings for low high temperature as we use warm water for bath not hot. Thanks. :)

  • Srikar

    Hi Abhishek,

    I want to choose between AO-SMITH and Rachold 15L water heaters, one has a standing loss of 0.451 and another 0.461. How much of a difference does this actually make? It feels too small a difference. Please guide me.

    Thanks

    • https://www.bijlibachao.com Abhishek Jain

      Hi Srikar,

      Standing loss is amount of heat loss (in units of electricity) that can happen if hot water is left in the water heater for a full 1 day. This means that any model with standing loss of 0.451 will loose 0.451 units (electricity equivalent) of heat in 1 day if you leave hot water in it.

      Frankly if you use up all the hot water efficiently, the standing loss will not matter at all. But then as you rightly guessed, the difference is too small.

  • Bharath Babu

    Dear Abhishek, I have Ferroli Calda 15. We knew the water heater stops heating when it reaches set temperature (thermostat) and re-start when the heater loses temperature. I want to know how many degrees of temperature drop is required to re-start heating. Please try to get the answer.

  • Rajesh

    Hi 4 memebers are there in my home, i want to purchase geyser, plz suggest company,model,capacity is best for me

    • https://www.bijlibachao.com Abhishek Jain

      Will it be used in bathroom? Will it be used for shower bath or bucket bath? If you will use it for shower bath, then 15 lts would be better else, 10 lts would be good enough.

  • laks

    Hi,
    Want to buy a gas water heater for house. I need a better model. Can anyone please suggest. we have instoshot which needed servicing lot of times.

    • https://www.bijlibachao.com Abhishek Jain

      Hi,

      Most leading brands have gas water heaters these days. Racold, AO Smith, Bajaj, Havells, Venus all are leading brands.

  • aasha

    We also want to use the same tap for cold water usage with high force will it affect the geyser?

    • http://www.bijlibachao.com Abhishek Jain

      pipes for cold and hot water are usually different. So it should not affect the geyser.

  • aasha

    Hi
    We have 6 family members using 50ltrs of water each and there is 20 -30 min gap after each bath.we live in pune. We want to buy a storage geyser. Plz suggest me the right capacity geyser to save electricity.

    • http://www.bijlibachao.com Abhishek Jain

      If 50 lts per person total daily consumption or just for bath? As just for bath 50 lts is a whole lot of water. Ideally a bucket bath involves about 15 lts and shower bath involves 25-30 lts of water.

    • aasha

      It is for 2 times bath daily for 6 person.

    • http://www.bijlibachao.com Abhishek Jain

      If 50 lts is for 2 bath then 25 lts for 1 bath. In that case a 15 lts water heater should be good enough for your use and electricity saving. You can look at top most efficient water heaters on this link: http://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

    • Bharath Babu

      As Mr. Abishek said, you can go for 15 storage geyser. It is suffice. My recommendation for you is to go for Ferroli Calda 15 which is brand new and I found this better than all brands which are currently available in the market. I have installed 3 geysers at my 3 bath rooms and all 3 are working fine.

  • Bharath Babu

    1. Which type of connection tube is recommended for storage water heater ? SS tubes or Rubber tube (suitable for hot water upto 70 degree-Water Tech brand ) ?
    2. If water re-filling in tank is cycle process, when hot water is withdrawn, then there will be reduction in temperate of hot water (set temperature) which is due to re-filling of cold water. Hence, we won’t get hot water as per our set temperature. How to manage this to get hot water as per set temperature ?
    3. When water become empty in Over head tank, the water heater won’t get water re-filling. In such cases Heating element will be damaged if water is not there in the water heater tank. How to manage this ?
    4. We noticed that the hot water flow from the shower is too slow. But, cold water flow is OK. Is there any problem with my newly installed 15 L geyser ?
    5. We noticed that while bathing the temperature of hot water inside the water heater gradually reduces. (2 degree Centigrade reduction in every minute). Can we avoid this temperature reduction ? My set temperature is 50 degree centigrade. But, I am getting this temperature only for 2-3 min. Soon after, I am getting temperature only 35 degree centigrade by gradual reduction in temperature. Is there any problem with my new water heater ?

    Please clarify above points.

    • http://www.bijlibachao.com Abhishek Jain

      The only thing that a water heater does is: heat water to the set temperature. It does not regulate the flow of water. The pressure of water flow (or rate of flow) will depend on the pressure in the system and the piping used. It does not have inbuilt system (pumps etc) to increase the flow of water. If you need that, then you need to put external pumps or increase the height of the water heater from the shower level.

      Now to answer your questions:

      1) SS tubes are more long lasting as compared to Rubber tubes (which can get damaged and can cause leaks). However, it is better to go for stainless steel flex connectors (as shown in this link: https://www.plumbingsupply.com/images/water-heater-flex-fip-ptc-18.jpg) as they have stainless steel plus rubber insulation.

      2) The water in the storage tank gets heated to 65-70 degrees. For home use you do not need water having temperature more than 40 degrees. So you will need to mix hot water and cold water if the temperature of water is more. The tank will get filled with cold water (unless you have something to stop it) when hot water is drawn out of the water heater. Some brands like Havells have models that prevent this mixing. But 99% models in the market do not have this feature. So the right sizing of water heater based on the need is very important.

      3) I don’t think emptying of overhead tank will cause damage to water heater, but it is better if you switch it off immediately, else you will waste electricity.

      4) For slow water rate, you will either have to install a pump or increase the height of the water heater so that there is pressure difference.

      5) 15L water heater is a bit small for shower bathing especially if you are used to long shower baths. Average water consumption for a shower bath is 25 lts (statistical average). Some people use more than that as well. If your usage is more then it is highly likely that you will get cold water after some time as a 15 lts water heater would take about 15-20 mins to heat water to its capacity. This is not a problem with your water heater, but more of a problem of undersizing the water heater.

    • Bharath Babu

      Thanks for your immediate responds.

      But, I’ve very recently brought Ferroli, Calda, 15 L Water Heater.

      1. Long lasting of SS tube is agreed. But, the seller recommends to have Rubber tubes (suitable for hot water) since, SS tubes sometimes may shock/leak electricity or earth to user. Is it true ? Shall I go with seller recommendations or ask only for SS tubes?

      2. According to your point no. 5. post withdrawing of hot water from shower tap (approx. 4L) I am getting gradual reduction of the water temp. from 55 to 32 deg C (My set temp. is 55 deg C). Water with 32 deg C is unfit for hot water bathing. How to solve this issue ? My usage during shower bath is not more than 15 L.

      3. Can’t we get 15L of hot water from 15L water heater ? If no then, how much is minimum volume of hot water supposed to get from 15L Heater ?

      4. According to your point no 3, during bath using water heater, if no water supply to water heater due to emptiness of Over head tank(Sintex-1000L) the heating element become dry due to heat and get damaged. However, we can not ensure the fullness of Overhead tank, all times. We come to know about the emptiness only If we observe no water supply from the tap during bath. After observing this only we can switch off the power. Before we switch off the power, the heating element will have no water hence, there are chances of damage to heating element due to dryness. Am I right ? If yes, do you recommend any preventive action to safeguard the heating element which is the heart of Water Heater ?

      5. How long the 15 L Ferroli Calda water heater preserve the hotness of water?

    • http://www.bijlibachao.com Abhishek Jain

      Hi Bharath,

      1) Shock happens when there is earth leakage in the wiring. Which is actually not good. You should always use RCD in your house to prevent electric shock. Here is more about RCD: http://www.bijlibachao.com/general-tips/why-is-rccb-necessary-for-your-house-rcd-electric-shock-residual-current-detectors-rccb-circuit-breaker.html

      2) The only solution to have continuous hot water is to go for bigger water heater. I do not think you can solve it with your existing water heater (unless you have an option/thermostat to increase temperature from 55 to say about 70 degrees). I think Ferolli Caldo has thermostat to adjust temperature to 70 degrees.

      3) Depends on how hot you actually call hot and what is the temperature of input/cold water. Typically one would need water at 39-40 degrees for bathing. Total volume of water from 15 lts water heater will be less in a cold city as compared to a hot city.

      4) I do not think that heating element should get damaged in case if you switch off the power after few minutes if the tank getting empty.

      5) Frolli Caldo is BEE 5 star rated water heater. It would have standing loss of about 0.45 units (kWh) per day. So in 1 hour the loss would be 0.45/24 = 0.01875 unit per hour. Which means it will loose 0.01875/(15×0.0012) = about 1 degrees temperature per hour. So if you heat water till 70 degrees and leave it in the water heater for 1 hour, it would become 69 degrees.

    • Bharath Babu

      To add answer to my point no.4, To safe guard the heating element from damage when no water flow from the Overhead tank, the product is equipped with safety valve which controls not to permit water flow from tap (point of use). Hence, water will be always available to contact with heating element to prevent dry heating.

    • Bharath Babu

      As mentioned in your point no. 2, How Havells can prevent mixing ? I’ve also noticed that they use Whirl Flow Technology for this. Do you have any idea how this technology works ?

    • http://www.bijlibachao.com Abhishek Jain

      I am not very sure on how this technology works. May be they close the incoming water source till the point the hot water in the heater is used up completely.

    • Bharath Babu

      Is there any minimum time or temperature drop required to again switch on the thermostat when observed a drop in temperature ? My Heater is equipped with digital display temperature panel.

    • http://www.bijlibachao.com Abhishek Jain

      There has to be some sensitivity for thermostat. How much is it, I am not sure about that.

    • Bharath Babu

      I am using Ferroli Calda 15 L Water Heater.
      How much electricity units will be consumed to heat 15 L water (one time). Inlet water temperature is 30 deg C. Hot water requirement is 60 deg C.
      Pls comment on the same parameters of Ferroli Calda10 L also.

    • http://www.bijlibachao.com Abhishek Jain

      Formula is simple and as mentioned above:

      Energy consumption = Volume of Water x Temperature Difference x 0.0012

      so for 15 lts it would be 15 x (60-30) x 0.0012 = 0.54 units per round (15 lts) of heating
      for 10 lts it would be 10 x (60-30) x 0.0012 = 0.36 units per round (10 lts) of heating. Additionally there would be some standing loss (as per specification of the model) which will depend on the time for which hot water is left in the water heater.

      Typically standing loss value mentioned on the water heater is units lost per day. So if the value is 0.4 units, then it means that the water heater will loose 0.4 units if the water is left in the heater for the full day. If you do not leave water in the heater, it would be negligible.

    • Bharath Babu

      Thanks for easy explanation. What is 0.0012 ?

    • https://www.bijlibachao.com Abhishek Jain

      The standard formula is m (mass) * cp (specific heat) * dT (temperature difference). We have converted mass to litre and multiplied it with specific heat and that’s how we have come up with this number of 0.0012.

    • Bharath Babu

      Can you please derive the formula by putting values for mass and specific heat ? I would appreciate if you can explain this as did for energy consumption calculation. What is meant by specific heat ? Whether the value of specific heat applicable to all capacity of water heater ?

    • https://www.bijlibachao.com Abhishek Jain

      Specific heat is explained well on this link: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/spht.html

      The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. ….. it does not change with capacity of water heater ….. it is a constant value.

      Specific Heat of Water is 4.19 KJ/Kg degree centigrade ( source: http://www.engineeringtoolbox.com/heat-work-energy-d_292.html)

      1000 joules or 1 kJ is 0.000277778 kWh or unit of electricity (source: http://www.rapidtables.com/convert/energy/Joule_to_kWh.htm) …… so converting 4.19 KJ/Kg degree centigrade to KWh/Kg degree centigrade would be 4.19 * 0.000277778 = approx 0.0012 kWh/Kg degree centigrade

      So if you have 1 lts, that is equivalent to approx 1 kg water.

      So to raise temperature of water from 30 to 40 degrees would be

      1 kg x 0.0012 (specific heat in kWh/kg degree centigrade) x (40-30)

      and that is where 0.0012 comes into picture.

      The values does not change with capacity of water heater … nor does it change with brand of water heater …. it is a universal constant!!

  • JABBAR ABDULLAH

    WE ARE FAMILY OF 4 PERSONS . WE HAVE PRESSURE PUMP ATTACHED TO BATHROOM SHOWERS. 3 PERSONS BATH IN SHOWER SIMULTANEOUSLY. 50LTRS OF GEYSER WILL BE OK AND HOW MUCH ELECTRICITY UNITS WILL BE CONSUMED.

    • http://www.bijlibachao.com Abhishek Jain

      Depends on total water consumption. If every individual uses about 25 lts of hot water then total would be 100 lts. Typically you would consume water at 40 degrees centrigrade (not much more than that as it will not be bearable). So the electricity consumption would be : 100 x (40-20) x 0.0012 = 2.4 units per day.

  • Abhishek Sah

    hi Abhishek,
    in market there are two type of water heater ,, one is based on storage type and other one is pipe based where the water passes through hot water pipe regularly ,,can you suggest which one will preferable for 4 member person in home .

  • Kaushik Acharya

    Hi Abhishek Jain,
    What would you suggest for Bangalore for 3 adult member family: 15 ltr or 25 ltr? In Bangalore morning bath needs hot water almost throughout the year.
    Also does it depends whether we use hot water with shower + tap vs only tap. In these two scenario which one of the 15 ltr/25 ltr should we consider?

    Regards,
    Kaushik

    • http://www.bijlibachao.com Abhishek Jain

      Hi Kaushik,

      A lot depends on how soon the water heater is used again after 1 use. A 15 lts water heater will be more than sufficient for 1 person to take bath. But once one person has used it, the water will again take about 15-20 mins to heat up. So the person going next will not get hot water immediately if the person uses it immediately after the first person.

      However with a 25 lts water heater, the 1st person will not use the whole of 25 lts (unless one takes extended long bath), so the next person will get some leftover hot water immediately.

      But with 25 lts it is highly likely that a lot of hot water is left behind in the water heater (after the last person takes bath). And if that happens, then you are loosing some electricity as heat will be lost from the water over the day. So to save electricity it is better to go for 15 lts water heater.

      Typically when one uses bucket for bathing, then the water usage is less. 1 bucket at max stores 15 lts water. Water heaters heat water to 60 degrees and for bathing you need water at 38-39 degrees. So if you use only bucket for bathing, then 10 lts water heater is good enough as with 10 lts hot water and 5 lts cold water (approx) you can get a bucket full of good hot water for bathing. While using shower, people tend to use more water. An approximation that is used for calculation is about 20-25 lts of water usage with using shower. Now that again can be managed with a 15 lts water heater as you will also mix some cold water to it.

  • abhijit

    i want to install a water heater for three people . 2 adult & 1 infant .we live in Delhi . daily usage is up to 90 liters . which water heater should i choose , instant or storage .

  • Shwetank Awasthi

    Hello..

    We are family of three adults living in Vaishali Ghazaibad… we shall be using hot water for bathing by bucket and sometimes will be using for shower. . Geyser to be used in one bathroom only. Pl. suggest whether i should go for 15L or 10L?

    Secondly how much difference will be in monthly electricity bill between 15L and 10 L ?

    Third I have shortlisted 3 geyser, Kindly suggest will be best one-

    (a) Racold 15L 4 Star CDR15 Vertical Geyser

    (b) Racold 10L 4 Star CDR15 Vertical Geyser

    (c) Crompton Greaves 15L Metal Body SWH315E Geyser

    Thanks & Best Regards,
    Shwetank

  • Amit

    Dear Team, I will have many guest soon in my house in Gurgaon. I have 10 bathrooms and 4 storage gysers of 25 ltr capacity to support all bathrooms,around 50 persons will take bath for few days. should I fix instant heater or storage gyser ? what would be the better option to provide enough hot water to my guests? it would be the continuous use of bathrooms, I don’t want that any person stuck with cold water during the bath. how many heaters or gysers should I need to install ? can I fix them in parallel connection to increase the capacity. Thanks

    • http://www.bijlibachao.com Abhishek Jain

      HI Amit,

      25 lts will be storage and not instant. Instant heaters do not work well in North. 4 number of 25 lts sounds small. If people use shower for bath then each person would need 10-15 lts of hot water each. And time taken for 25 lts to heat up will also be more. You would have to increase the number of water heaters.

    • amit

      Thanks for your response. can I fix the 4 more storage gyser of 50 ltr capacity in a parallel line( two geysers together ) or should I fix one instant geyser with one storage geyser in same line to reduce the heating time.
      Thanks

  • Damodar chari

    Hi we are 4 members in our family.. I want to buy a new gyser.Iam confused to buy a instant or storage water gyser…please help me out….

  • Swapna

    Hi we are 5 members in my family including me. We have two bathrooms . We want to put geysers in both bathrooms. Kindly suggest the suitable size geyser. Can you also suggest the best brand available .

  • mb

    I was using 3kw instant geyser 3ltr Bajaj majesty in my old house. Now i shifted to new house where I has install 63amp single phase RCCB in my new home at electricity box. When start this geyser immediately RCCB trips. Now In winter in Baroda, I have to purchase new geyser with lessor wattage. Pl. Suggest weather 2kw geyser will work.

    • http://www.bijlibachao.com Abhishek Jain

      Hi,

      63 Amp rating of RCCB is the total load it can handle. And that is a high enough value for a house. 62 Amp means you can support approx 63 x 220 / 1000 = 13.86 kW of load. So 3 kW should not be a problem. There can be two things in this case:

      1) Either the geyser is faulty which is causing the leakage and it should be fixed.
      2) It is possible that RCCB is too sensitive. You will have to look at sensitivity level of the RCCB. It is typically in milli amp. So if the geyser is fine and suppose the RCCB has sensitivity of 100 milli amp then you can get RCCB that is sensitive to more than 200 milli amp.

      Your electrician should be able to help you with this.

  • nitin

    hi am living in pune with 2 adult member including me &1 child.
    required to take shower bath
    pl suggest for sufficient & good one.

    • http://www.bijlibachao.com Abhishek Jain

      Hi Nitin,

      A 15 lts water heater should be more than sufficient for you for shower bath. You can look at these:

      AO SMITH
      HSE-VAS-015

      AO SMITH
      HSE-SDS-015

      AO SMITH
      HSE-SAS-015

      AO SMITH
      HSE-SES-015

      AO SMITH
      HSE-SBS-015

      MORPHY RICHARDS
      Lavo EM15

      MORPHY RICHARDS
      Lavo Digi15

      HAVELLS
      Monza Ec 15

      HAVELLS
      Puro Plus 15

  • Thinlay

    Hello team,
    We have a small hotel in North delhi with 20 rooms with bathrooms attached. I am deciding as to what size geaser 10ltr or 15 ltr. Should I buy ur regular geaser or the instant heating one. My main concern is the impact on electricity bill as you already know they are very high in delhi. Each room mostly has an average of 2 guests. We have showers for them. More over customers normally leave the geaser switch on the whole day something we can’t monitor also. So please suggest the right size and type of geaser instant or regular and also which brand would make sense as I am looking for something which has value for money.
    Thanks thinlay

    • http://www.bijlibachao.com Abhishek Jain

      As you are in Delhi, an instant water heater or 10 lts one will turn out small if people use shower for bathing. So least you will have to go for is 15 lts as winters are too cold. You should go for one with minimum standing loss (among 1st 5 positions in the list above) so that you do not incur lot of electricity bill due to guests leaving water heater on for the full day. An intelligent system (occupancy sensor based) that can turn off the electricity in the room when no one is there in the room will be very helpful for you.

  • VALIGATOR

    Hello,

    We are a family of two. We just shifted to stay on 7th floor of 7th storey building. We have a 25ltr Storage Gyser and 300 ltr loft tank attached to shower. But due to poor presser shower does not work well so we have not yet used both. so we’re planning a pressure pump.

    Here are my questions
    A) is the storage geyser enough or 15ltr will do.. Space is less on loft so we are contemplating changing to a smaller geyser.

    B) by attaching .5hp pump to loft tank which supplies water to storage gyser, b1) will water heat up? b2) will it spoil the storage geyser?

    C) will an instant geyser 3ltr also work in above case?

    Please help, desperate to have a hot shower in our new bathroom.

    PS we live in Mumbai and in a flat below terrace that anyway gets hot.

    • http://www.bijlibachao.com Abhishek Jain

      Here is my response:

      A) 15 lts water heater is more than enough for shower bath in Mumbai. Even a 10 lts one would do (unless the time gap between two people using it is quite less).

      B) You can certainly use 0.5 hp pump. That kind of pump will generate high pressure, but then there are water heaters available in market that can handle high pressure up to 120 PSI. You will have to go for one that can handle high pressure.

      C) Well depends on usage. 3 lts water heater may not be good for long shower bath. Would work for a very quick bath.

    • VALIGATOR

      Thank you so much for your precise response!
      if I may ask, please can you tell me which are the top 2 water storage heaters that can handle high pressure that I need.

      Regards,
      Valroy (Valigator)

    • VALIGATOR

      Hi Abhi,
      Any luck with this query?

    • http://www.bijlibachao.com Abhishek Jain

      HI,

      Currently we do not capture water pressure data to exactly tell you which model will be the best. But one thing that I have observed is that almost all of the models from all the top brands (Havells, Racold, AO Smith, Bajaj) have capability to handle high pressure.

  • Palanivel Rajan

    Dear Team,
    We are small family accommodated with 2 Adults and 2 Childrens living in Chennai.
    Could you please advise What is the best Size of the Geyser is usable, Will 3Ltrs is sufficient, if so What is the best brand to buy the same.
    Kindly revert as early as possible.

    • http://www.bijlibachao.com Abhishek Jain

      Depends on what you want to use it for. For a bucket bath in Chennai, a 3 lts geyser may also work (if the bucket is 10 lts bucket). 6 lts storage one would be safe for most regular buckets. But if you use shower then 6 lts one will be good for short showers and not for long ones. The smaller water heaters heat up fast, the bigger ones take more time. So all will depend on your usage. You can go for Havells, Racold, AO Smith or Bajaj water heaters.

  • Sunach

    Hello..
    We are family of three adults lving in Noida… we shall be using hot water for bathing by bucket only. Geyser to be used in one bathroom only. Pl. suggest whether i should go for storage type geyser or instant one.

    • http://www.bijlibachao.com Abhishek Jain

      Instant water heaters will not work well in Noida as climate is quite cold in winters. If all the three adults use hot water immediately one after another for bath then 25 lts model would be better. If there is a gap of 15-20 mins between usage then 15 lts should be good enough.

  • rohit

    Hello bijlibachao.com
    Sir. We are 5adults and uses two bathrooms. How much capacity of water heater should be appropriate. We prefer bucket bath only

    • http://www.bijlibachao.com Abhishek Jain

      A 10 lts water heater is good enough for bucket bath. If you live in a warmer place like Mumbai then even 6 lts works well.

  • Deepti Gupta

    I am reloacting to Navi-Mumbai so sont have much idea.
    Which geysers are best suitable for Mumbai? I think the geysers are not required there regularly but occasionally used for baby baths and hot baths.

  • TunaFish

    We have a peculiar problem. Due to the hot climate in Kolkata round the year, we have no need for water heaters, not even in winter as we prefer a cold bath. However during summer the tank water is just too hot for shower. So we need a water heater just to store some water which can provide cool water during shower. What size do you recommend for a family of four? Do you have a better solution or do you think its silly to spend money on water heater to get a cold shower?

    • http://www.bijlibachao.com Abhishek Jain

      Hi,

      I don’t think it would be wise to invest in a water heater when you do not need one. I think it will be far economical and better if you use a big vessel made out of clay (something like a matka or earthen pot that is used for cooling water). Clay vessel can significantly cool your water especially in summers (as it works awesome in sun). You can then mix water from this vessel with hot water to get normal water for taking bath. You can get a custom vessel made by any matka (earthen pot) maker in your area. And fit pipes in it to make the water flow through.

    • TunaFish

      Well its a good idea but I don’t think a clay pot would look sophisticated inside a bathroom. What we want is to fit some sort of container on our bathroom wall which would automatically store 30-35L from the overhead tank at room temperature (cool) with which we can shower comfortably. Do you have any better idea or do you think we should custom-make some sort of plastic container to fit on the wall and attach pipes to it? If its possible to order something like this pre-built then that would be preferable.

    • http://www.bijlibachao.com Abhishek Jain

      Well it all depends on how you get that clay pot made. It can be a designer one as well (with nice looking patterns on it). However easy solution would be to have a custom plastic container in the bathroom that can be filled up early in the morning when the water is not hot. Going for a water heater to do the same will not be like spending more to get less value out of it.

    • Deepak

      There are plenty of indoor water tanks available. They are flat and mounted on the ceiling. Just go to a local market where a shop sells water tanks or search on snapdeal. No need to buy a geyser just to store water.

      Here is one example: http://www.snapdeal.com/product/hitank-natural-white-single-layer/673549440590

      That one is expensive because it’s 150 liters. Search around, you’ll find a smaller one.

    • Deepak

      By the way, these are called ‘loft tanks’.

  • Guest

    Hi,

    p { margin-bottom: 0.1in; direction: ltr; line-height: 120%; text-align: left; widows: 2; orphans: 2; }a:link { color: rgb(0, 0, 255); }I live in Delhi, which is famous for its cold. I am looking for an instant geyser for our bathroom. There are three of us who are going to be using it. Should we go for a 3L one or a 6L one?

    Thanks in advance!p { margin-bottom: 0.1in; direction: ltr; line-height: 120%; text-align: left; widows: 2; orphans: 2; }a:link { color: rgb(0, 0, 255)live in Delhi

    • http://www.bijlibachao.com Abhishek Jain

      Hi,

      In Delhi the climate gets super cold in winters. Which means that instant water heater (1 or 3 lts) will not be sufficient for your needs. A 6L storage one will also be barely good enough for a bucket of water (a medium sized 10 lts bucket). If you plan to use it with shower, it will not work. It will be better for you to go for 10L water heater. You can look at the list above.

  • Kamlesh

    Sir I am looking for Havells 1 litre or 3 litre instant geyser can you suggest which one is good Havells Opal or Havells Neo and why if possible Thanks in advance

    • http://www.bijlibachao.com Abhishek Jain

      Hi Kamlesh,

      Havells Opal looks better.

  • Sana

    Sir, I posted a query on 18th of Aug and I did not receive any reply. Can you please revert back.

    Thanks and regards
    Sana

  • Raufahamad Pathan

    Hi Bijli Bachao Team,

    I am from Pune, I am planning to install instant Geyser but for low water pressure. Water inlet to geyser will be from my loft water tank, which will have height of 1-1.5 feet.
    In my 2 bathrooms, i am aleardy having AO smith 15ltr and Bajaj 1ltr geyser installed. I am looking for 3rd geyser for my third bathroom.
    On this point, which branded geyser i should go for? please mentioned with model number as well.
    Can you please provide your valuable inputs on this to resolve this difficult situation.

    Thanks and Regards,
    Rauf

    • Bijli Bachao Team

      Hi Rauf,

      Apologies, but currently we do not have data to figure out models that can work in low water pressure conditions.

  • Sana

    We live in a high rise building on 10th floor of 28 floor building and water is bore water. Please suggest a good water heater for a family of 4 people.

  • Krishna

    Hi, We, a family of 3 people, live in chennai with occasional guests. We are looking for geyser which will be connected to 2 bathrooms. It is mostly bucket bath and occasionally shower. While 2 of us mostly go for cold water bath, one of us compulsorily needs hot water bath. All of us bath twice a day. Which is the most suitable geyser for us. Sorry I missed out to add that we stay on 9th floor of a high rise building of about 30 floors and water pressure is too high for shower bath

  • Aayush

    Sir tell me which water geyser is used in home for save electricity.
    For kitchen and bathroom which geyser size is right

    • Bijli Bachao Team

      I would suggest you to go for 1 or 3 lts instant water heater for kitchen and 10/15 lts models for bathroom.

  • Debashis Mitra

    Hi, I am planning to put one geyser for one of my bathrooms. We are 5 member in the house. There are 4 adults and 1 kid. I already have 1 solar heater in my one bathroom, and I want to use geyser in my another bathroom. We generally use mix of bucket/ shower, but shower option is more. Please suggest should it be instant or storage one or what would be the capacity. On an average there would 3 adult and 1 kid would be using the same on an average.

    • Bijli Bachao Team

      A 15 lts water heater would be good for you. You can look at these:

      HAVELLS QUATRO 15
      AO SMITH HSE-VAS-015
      MORPHY RICHARDS Lavo Digi15
      MORPHY RICHARDS Lavo EM15
      Ferroli Caldo.15V
      HAVELLS QUATRO DIGITAL 15

  • Baira Raghavan

    Hi there:

    I am planning to install water heater in 3 bathrooms. There are 2 adults and 4 kids. Usually, it is bucket bath. Usually, two bathrooms are used at a time. What do you suggest? Instant or storage. If instant, how many litres and if storage, how many litres. Also, would you please let me know the advantage of instant over storage or vice versa. Also please let me know what brand to buy.
    Your suggestion would really help a confused soul.

    Thanks, Baira

    • Bijli Bachao Team

      If you do not live in a place with extreme cold climate then a 6-10 lts storage water heater would do. Or if you want to go for instant then you need to go for a 3 lts one with 3-4 kW heating element.

      Benefits of Instant:

      1) It saves electricity (consumes less units).
      2) It saves space.
      3) It heats fast as the heating element is of higher kW.

      Drawbacks of Instant
      1) Higher kW means higher load on the electricity connection. Which means you will need better wiring as well as higher connected load from the electricity distribution company. This can increase the fixed charges component of electricity bill (however it will still be less than energy charges).

      2) It cannot work with showers as the water required for shower bath is lot more.

      Top brands: Havells, AO Smith, Racold, Bajaj, Ferolli, Venus. You can buy an instant water heater from any of these brands. Just make sure that you look at the wattage of heating element. It should be 3 to 4 kW.

  • Dhawal

    Hello,
    I would like to install 3 shower panels and 3 different bathrooms. Each bathroom will be used by 2 to 3 persons. What size and type of geyser is required? I always want always on geyser which gives continuous hot water to wash basin, shower, taps etc 24X7 but I guess electric consumption will be too high. Please advice.

    Thanks in advance.

    • Bijli Bachao Team

      Hi Dhawal,

      If you keep the geyser on for 24×7 then certainly it will increase the electricity consumption of the geyser. The biggest loss would be the standing loss of the geyser. Standing loss will be more if you go for a big sized geyser. I would suggest you to go for a BEE 5 star rated 15 lts geyser as it would suffice your bathing needs as well as will have lesser standing loss as compared to bigger geysers. You can check the list of top ten water heaters (by size) on this link: http://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

    • Dhawal

      Hello Bijli Bachao Team,

      Thanks for your reply. So this is the model you are suggesting with lowest standing loss?

      http://www.snapdeal.com/product/havells-15-quatro-digital-geyser/483036884

      Will this be able to work with shower panel as I saw on AO smith website and they said 50 Liters Geyser is needed for shower panel as you can see on following link

      http://www.aosmithindia.com/How_select_Water_Heater.html#q2

      Please advice as this wont be normal shower but it will be shower panel with one rain shower and 4 body jets and atleast 2 to 3 people should be able to take a bath one after another.

      Thanks in advance.

    • Bijli Bachao Team

      Hi Dhawal,

      If 2-3 people are going to use it immediately one after another then you can go with a 50 lts water heater. A 15 lts water heater will take 20-25 mins to heat up again. Also if you have a panel then you can go with 50 lts.

      Ideally electricity consumption depends on amount of hot water you use. If you use more then electricity consumption will be more. Also if you go for bigger sized water heater, then the standing losses are also more. That is why we suggest people to go for 15 lts water heater for regular shower. You can look at these:

      Ferroli Caldo.50V
      MORPHY RICHARDS Premio Digi50
      MORPHY RICHARDS Fervo Digi50
      MORPHY RICHARDS Lavo EM50
      Ferroli Caldo.50H

  • Jeetendra

    I want to install water heater in my manufacturing unit where I need 30-40 ltrs of water at 50 deg Centigrade after every 20 minutes. Please suggest me suitable options. Thanks ..

    • Jeetendra

      Also please let me know the no. of electric units it will consume per cycle. Thanks…

    • Bijli Bachao Team

      Hello Mr Jeetendra,

      Assuming that incoming water is at 20 degrees, you would need 40 x (50-20) x 0.0012 = 1.44 units or kWh of electricity to heat water to 50 degrees. If you need it every 20 mins then you need a heater with heating element of 1.44 x 3 = 4.32 kW. So you need heating element of roughly 4-5 kW.

      However as you need it for commercial use and you need frequent heating, I would suggest you to go for heat pump based water heater of 75-100 lts capacity. It would be 3-4 times more energy efficient than regular water heater. So instead of 1.44 units per cycle it would consume 1/3 or 1/4 of it. Heat Pump is just like an AC. You would have seen that ACs throw heat from the outdoor unit. Heat Pump based water heaters use that heat to heat water. So it can serve dual purpose of AC as well as water heating, and on top of it, it will be highly energy efficient. You can look at these cataloges:

      http://www.aosmithindia.com/New_Commercial_Products/AWH.pdf

      http://www.racold.com/pdf/Heatpump.pdf

      http://www.venushomeappliances.com/commercial-hp.html

  • Shebu

    Hi Team,

    I live in Coimbatore and we are 4 adults family, please suggest a water heater with capacity used for shower/bucket bath only. Can I connect a single water heater to 2/3 bathrooms, if so suggest the water heater capacity I need to look for..

    • Bijli Bachao Team

      You may look at any of these:

      HAVELLS QUATRO 15
      AO SMITH HSE-VAS-015
      MORPHY RICHARDS Lavo Digi15
      MORPHY RICHARDS Lavo EM15
      Ferroli Caldo.15V
      HAVELLS QUATRO DIGITAL 15

      If you want to connect multiple bathrooms, then you will have to go for bigger 50 lts water heater. But I would not recommend that from an energy savings perspective.

  • Vivek

    What is the smallest horizontally wall-mounted gyser sufficient for 1 person?

    • Bijli Bachao Team

      Hi Vivek,

      What is the width/height that you want to fit your geyser in?

  • sarathy

    We have 5 members in our family . Out of 5 ,three are adults . can u suggest a water heater for us ??? we live in Bangalore , karnataka. I plan to buy 2 water heaters for 2 bathrooms. I expect a energy efficient / very reliable brand.

    • Bijli Bachao Team

      Hello Sarathy,

      A 15 lts water heater would be good for you to have shower and save electricity as well. You can look at these:

      HAVELLS QUATRO 15
      AO SMITH HSE-VAS-015
      MORPHY RICHARDS Lavo Digi15
      MORPHY RICHARDS Lavo EM15
      Ferroli Caldo.15V
      HAVELLS QUATRO DIGITAL 15

      If you use bucket for bathing then you can look at these:

      HAVELLS QUATRO 10
      MORPHY RICHARDS Lavo EM10
      Ferroli Caldo.10V
      MORPHY RICHARDS Salvo 10L
      Bajaj Shakti GPV 10 GL

  • Bharath

    We have four members in our family . All four are adults . can u suggest a water heater for us ??? we live in mysuru , karnataka.

    • Bijli Bachao Team

      If you mostly prefer bucket bath then a 10 lts water heater will be more than enough. In that case you can look at these:

      HAVELLS QUATRO 10
      MORPHY RICHARDS Lavo EM10
      Ferroli Caldo.10V
      MORPHY RICHARDS Salvo 10L
      Bajaj Shakti GPV 10 GL

      But if you prefer shower bath then you would need 15 lts and in that case you can look at these:

      HAVELLS QUATRO 15
      AO SMITH HSE-VAS-015
      MORPHY RICHARDS Lavo Digi15
      MORPHY RICHARDS Lavo EM15
      Ferroli Caldo.15V
      HAVELLS QUATRO DIGITAL 15

  • Prashant

    We are three members in family. Two adults and one child living in Pune. Which Water Heater will be suitable for us?

    • Bijli Bachao Team

      Hi Prashant,

      A 10 lts water heater should be good enough for your family. You can look at these:

      Morphy Richards Salvo 10L
      Havells OPAL 10
      Usha Aquagenie 10L
      Bajaj PX 10 GLR
      Havells BUENO 10
      Bajaj Majesty 10 GPU
      AO Smith HSE-SBS-010

  • Anand

    Hi Team, I leave in Pune with my 4 family members. I am planning to buy Jaquar 25 Lit storage water heater for one bathroom.
    We selected Jaquar becasue, its giving Warranty 7 Years on Tank, 4 Years on Heating Element, 2 Years on Other Parts

    http://jaquar.com/products/elena-horizontal-volume-l-15

    Please suggest, if our choise is energy efficient too.

    • Bijli Bachao Team

      Hi Anand,

      This model is not there on BEE’s list and it looks like it is not rated by BEE. So cannot comment if it is energy efficient too.

  • sandeep

    Hi, I would like to install solar water heater but i found out that when the house was being constructed , plumbing was not done for solar water heaters. can we do plumbing now without any extreme modifications? how hard or easy it is? the house is G+1 wit two bathrooms in both the floors. thanks

  • vijay

    Dear Sir,
    I intend buying water Geyser for a family of four adults in Chennai -to be used only for bathing .What should be the ideal size .Which company’s geyser should be bought( having minimum standing loss) Can you suggest three companies name

    • Bijli Bachao Team

      You can go for 15 lts water heater. You can look at these:

      Havells QUATRO 15
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts

  • S.Viswanathan

    I would like to buy a instant water heater for my family, in our house only my wife uses hot water, and
    that too not more than one bucket. Can you suggest best instant water heater, whether it should be 1 lt.
    or 3 lt. capacity, and the wattage required.

    • Bijli Bachao Team

      Hello Mr Viswanathan,

      A 3 lts capacity water heater would be better for you. You can look at these:

      A O Smith EWS 3 L
      Havells Opal 3 L
      or Racold Pronto 3L.

  • Pradeep

    Mine is a family of six living in a place where the average winter temperature is 5 degree. Considering 2 buckets (hot + cold) per person for a bath, can you suggest a couple of models along with the required capacity. I prefer storage type.

    • Bijli Bachao Team

      A bucket of water is about 15 lts. A bucket full of water at 75 degrees when mixed with bucket full of water at 5 degrees would get you 2 buckets full of water at 40 degrees. Which will be more than enough for your need. So you should go for a 15 lts water heater. You can look at these models:

      Havells QUATRO 15
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts

    • Pradeep

      Thanks a lot again.

  • Pradeep

    Is it possible to use solar water heater in early morning where there is no sunlight ?

    • Bijli Bachao Team

      Hi Pradeep,

      As long as the atmosphere is hot outside the water heater can heat water. Also the water that got heated previous day will stay hot in the water heater because the water heater will have good insulation.

    • Pradeep

      Thanks a lot Bijli bachao team for the quick reply.

  • monika

    1 KW input then what is output KW of Geysers.

    • Bijli Bachao Team

      For electric geysers 1 KW input will give 1 kW output. It’s only with geysers of heat pump type that 1 kW input can give 3-4 kW output.

  • shashi

    Sir,
    I had downloaded a doc from ur website which had details about Geyser,
    Ranking Brand Star Rating Grand Total
    5 4 3 2 1
    1 RACOLD 30 20 1 8 0 59
    2 V-GUARD 21 9 4 2 0 36
    3 AO SMITH 21 8 0 0 0 29
    4 VES-STAR 20 0 0 0 0 20
    5 CROMPTON GREAVES 18 7 13 1 0 39
    6 HAVELLS 18 1 1 0 0 20

    Based on this I had opted for V GUARD ,but in most of ur reply either u suggest Racold or Havells ,is their any particular reason for this. I stay in Bengaluru, we are family of 3 and I had opted for 10 liter Geyser, we had connected solar heated water to Geyser ,

    • Abhishek Jain

      Hi Shashi,

      The list of top brands is based on number of energy efficient models listed with BEE (which is based on standing losses of various water heaters). When we suggest models we look at technology and features in various models and suggest accordingly. Models from Racold, Havells and AO Smith have nicer features that can save electricity, provide protection and are durable as well. However that does not mean VGuard is bad, but if we compare models on features, models from these brands come out better.

  • Rajesh

    Pls suggest between 10L racold eterno 2 vertical versus Bajaj majesty GPU 10L heater…which is better to purchase

    • Abhishek Jain

      Racold Eterno 2 is giving more warranty. So I would prefer that.

    • DR DEVA PRASAD SAHU

      I live at Bhubaneswar having a family of 3 members. We are used to bucket water bathing. Please suggest me whether am instant geyser (1 lt or 3 lt) will serve our purpose or a storage type will be better ? If storage type, then what is the ideal capacity ?? 10 L or 15 L ??? If I purchase from JAQUAR (HSE-SCJ 10 L or 15 L), is it OK ???? Or any other better manufacturers ? Kindly guide me.

    • Abhishek Jain

      Hello Mr Sahu,

      Bubaneshwar is not very cold in winters so even 3 lts instant water heater would work if used for bucket bath. If you go for storage then 10L one would be more than enough. Bajaj, Racold, AO Smith, Havells, Venus are some good water heater brands. If you are looking for instant water heaters then you can look in one of them. If you are looking for 10 lts water heater then you can look at these:

      Morphy Richards Salvo 10L
      Havells OPAL 10
      Usha Aquagenie 10L
      Bajaj PX 10 GLR
      Havells BUENO 10
      Bajaj Majesty 10 GPU
      AO Smith HSE-SBS-010

  • Rajesh

    Sir, we r a 6-member family in Nashik. All r using bucket bath. Planning to buy Racold Eterno-2 storage water heater.
    Please suggest proper size (10L or 15 L) for lesser electricity consumption and alternate better models.

    • Abhishek Jain

      Hello Mr Rajesh,

      You can go for 10lts Racold Eterno-2 water heater.

    • Rajesh

      Thanx for ur suggestions Sir..

  • Abhijeet

    Sir. I want to buy a Geyser for my Family in which there are 5 members. which is best suitable and which is energy efficient GEYSER?. which is best 10 Liters 15 liters or 25 liters. Please Guide me. And Prefer best Geyser.

    • Abhishek Jain

      Hello Mr Abhijeet,

      Which city are you in? Also do family members prefer bucket bath or shower bath? Is it only for one bathroom?

    • Abhijeet

      sir, my village is Naldurg which is near to solapur city. family member prefer both as shower and bucket bath. and there are two bathroom. as one is use for all and one is attached to the master bed-room.

    • Abhishek Jain

      Hi Abhijeet,
      You should go for 15L water heater for both the bathroom.
      You can look at these 15L water heaters.
      Havells QUATRO 15
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts

  • joseph

    Is 10 litre water heater good for a shower for one person pls?

    • Abhishek Jain

      Depends on the city. If it is not too cold then it will surely work. If you live in a cold city and take longish showers then it may not.

  • Bhargav

    We are a family of 2 adults and 1 child. We stay at Bhavnagar, gujarat, India. Which size geyser suits us most ? We get municipality water. We want to use it for shower or bucket bath either way. Thanks.

    • Abhishek Jain

      You should go for 15 lts water heater. You can look at these:

      Havells QUATRO 15 (Havells Quatro Digital has a remote control as well which can be quite useful)
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts water heater.

    • Bhargav

      Thanks abhishek.. I ordered racold cdr 15 ltr ivory.

    • Deshpande

      Abhiji in 1ltr 4.5 kq model is available will it HV more pier consumption?or for bucket bath 1ltr 3kw will suffice in pune for countinous stream bucket bath?

    • Abhishek Jain

      Hello Mr Deshpande,

      power consumption depends on the volume of hot water you use. It does not depend on KW of the geyser. KW just determines the speed at which the water becomes hot. A 4.5 kW instant water heater can provide more continuous hot water as compared to 3 kW water heater. However if you put a 4.5 kW water heater, make sure that you have enough connected load on your electricity connection to handle the same.

  • Anuj Mathur

    Hi Abhishek,

    Thanks for the useful information. I do have a query with regard to the optimum capacity of the geyser I should buy. My house has two main bathrooms and a guest bathroom. Unfortunately, the guest bathroom only has a horizontal space of 13? to install a geyser. Even the vertical space is at premium and a bulky geyser would not fit there.

    I bought a havells 15 litre geyser and tried to hang it at the place of installation (without actually installing it yet). Though it seems to fit snugly there, I do feel that there wouldn’t be any clearance or margin at all, neither on both sides of the geyser, nor from the top. An experienced electrical did also advise the same thing to me.

    If I buy the 10 litre version, it should fit appropriately there. But I am concerned whether it would be sufficient. Although the bathroom would only be used occasionally, it?s likely that the shower will be used rather than bucket. Considering the cold climate in Delhi, would a 10 litre geyser be sufficient for a single person?s shower bath. Or else, do you think that it would be appropriate to install the 15 litre version. Energy consumption would not be the deal breaker here.

    An early response would be much appreciated.

    • Abhishek Jain

      Hello Mr Mathur,

      10 lts water heater can provide a short shower bath not a longish one which people mostly like while using shower. If there is another bathroom close to this one, you may consider going for a bigger water heater for combined two bathrooms.

  • Jebin

    Kindly request your suggestion. I am trying to decide between a 3L and a 1L instant water geyser (both rated 3KW) for shower bath purpose. Per the calculations that you have explained below, for a 3L and temp difference of 30 C – time required is 6.3 secs; and for a 1L – same scenario – time required is 2.1 secs. If this is true, isn’t 1L model better?
    Based out of Bangalore and the water source is both borewell water and Kaveri water. Which brand is better – AO Smith, Racold or V-Guard or any others?

    • Abhishek Jain

      Hi Jebin,

      As per the calculation mentioned below it will take 2 mins to heat 3 lts and 42 seconds to heat 1 ltr by 30 degrees. The rate of heating remains the same at 3 KW. Better or not will depend on the rate at which you use the hot water. A 3 KW heating element can heat 1 lts in 42 seconds. If you are drawing 1 lts water in 42 seconds then you will get continuous hot water be it 1 ltr instant heater or 3 lts instant heater. Because the moment you draw water from the tank, cold water will fill it in.

      In general I would not suggest instant water heater for shower bath purpose specially when you live in B’lore where temperature is generally low. For shower bath in B’lore 15 lts water heater would be better.

  • mudu

    I need instant water electric heater or geyser 6 or below liters because I have already instant water electric geyser but electricity billing is too high every month. Please advice good instant water electric heater or geyser for low electricity bill. We have take bucket bath every day. I live in Mumbai.

    • Abhishek Jain

      Hi Mudu,

      Water heater of 6 lts capacity is not classified as instant. Instants are 3 and 1 lts models. If you are looking for 6 lts you can look at these:

      Havells BUENO 6
      Havells QUATRO 6
      Bajaj Majesty 6GPU
      A O Smith HSE-SBS-006 or HSE-SAS-006

      If you are looking for instant, then you can look at Racold, A O Smith, Havells, Bajaj or Venus instant water heaters.

  • Ashfak

    Ashfak from bellary Karnataka, we r 4 family members we using bucket bath which is better 3litr or 6litres plz reply.

    • Abhishek Jain

      I would say 10 lts is better, but if the choice is between 6 and 3 then I would choose 6 at least.

  • husein

    We want instant water geyser not storage geyser.below 6 liters. We take bucket bath.pls suggest good power saver or good star rating geyser or heater i live in Mumbai.

    • Abhishek Jain

      Hi Husein,

      You can go for AO Smith, Racold, Havells or Venus instant water heaters.

  • husein

    I need instant water heater (which can heat at least 10 liters of water) with low power consumption?

    Please advice? I live in Mumbai.

    • Abhishek Jain

      You can look at these models:

      I guess Indore is quite cold in winters. 6 lts is good for places like Mumbai that are not very cold in winters. And that too for bucket bath. So if it will be used just for bucket bath and temperature is quite low in winters then a 10 lts model will be sufficient. If it is for shower bath then you will have to go for 15 lts water heater. You can look at these 10 lts water heater models:

      Morphy Richards Salvo 10L
      Havells OPAL 10
      Usha Aquagenie 10L
      Bajaj PX 10 GLR
      Havells BUENO 10
      Bajaj Majesty 10 GPU
      AO Smith HSE-SBS-010

  • kumar

    Hi, Planning to install water heater for attached bathroom for single(sometimes two persons) usage. WATER PRESSURE is too LOW since its a single floor house and over head tank is just above the roof. Please suggest which type of geyser I can go with

    • Abhishek Jain

      Hi Kumar,

      Low pressure is not a problem for water heaters. High pressure is. However a question for you, will it be used for bucket bath or shower bath?

    • kumar

      Thanks a lot abhi for ur reply. my concern was, since the water pressure is low, it takes time to fill up, which might cause dry heating.(during filling). Coming back to your question, usually bucket, v.rarely shower. Again low water pressure might be a drawback for using shower. It would be great if you can suggest best type n capacity for the above requirement

    • Abhishek Jain

      Hi Kumar,

      For bucket bath 10lts water heater should be good enough. You can look at these models:

      10 lts models:
      Morphy Richards Salvo 10L
      Havells OPAL 10
      Usha Aquagenie 10L
      Bajaj PX 10 GLR
      Havells BUENO 10
      Bajaj Majesty 10 GPU
      AO Smith HSE-SBS-010

    • kumar

      Thanks a lot abhi

  • Mayur Ganeriwal

    thanks u abhishek for suggest me..

  • Aneesh Thomas

    Hi Abhishek,

    Thanks for sharing ur knowledge.. I really appreciate u for helping the unknown.

    I am Looking for a Water Heater For a Small House. I Would like to Knw, How fast a 6ltr 3000KW 5 star rated geyser can Heat Up the Water to Its Max Temp? If The Climate Temp Is around 20 Degree.

    Thanks
    Aneesh

    • Abhishek Jain

      Hi Aneesh,

      To heat 6 lts water to 60 degrees the energy required would be 6 x (60-20) x 0.0012 = 0.288 kwh or units. So time taken would be (0.288/3)x60 = ~6 mins.

  • Mayur

    hello abhishek..,
    u say dat all of them have protective inner coating technology dat prevent
    water heater from corrosion..
    can u tell me which brand is good and better .. i m confuse which product i
    buy..
    ao smith comes in blue diomand glass lines technology and raccold comes in
    polytene coating technology ..
    can u suggest me which is better .. racold interno dg 25 ltr.. or ao smith
    hse -ses , or venus splash digital..
    wat is means of 1kw/2kw/3kw..
    which temperature i set to warm water dats its works for long tym and how
    many tym taken to warm the water…
    regards…

    • Abhishek Jain

      Hi Mayur,

      Polymer based coating is better than Enamel based coating for hard water protection. You can go for Racold model.

      1 Kw/2 Kw/3 Kw means the rate at which water is heated in the water heater. 3 kW will heat fastest and 1 KW slowest.

      For 25 lts, a 1 KW heating element would take about 1 hrs to heat water, 2 KW would take 30 mins and 3 KW 20 mins.

  • Mayur Ganeriwal

    I m mayur from pratapgarh u.p .. i want to buy 25 Ltr water geyser.. which is good for me.. i select three model ao smith , racold interno dg 25 ltr , venus digital splash .. here in pratapgarh water is hard…
    Is remote control water geyser is good or manual ..

    • Abhishek Jain

      Hello Mayur,

      It is better if the geyser has a remote control. That gives an ease to switch on/off the water heater or change the temperature settings. To reduce electricity consumption it is better that you keep the temperature of the water heater at a lower setting. The three brands that you have chosen, all of them have protective inner coating to prevent the water heater from corrosion. An enamel coated glass lined tank is good for hard water. You can choose anyone of them.

  • Guru

    Thanks Abhishek,

    What the option for hardwater in 6

  • Guru

    Hi Abhishek,

    We are in Pune (Wagholi) were we have Bore well and water tanker which supply water (both areHard water) i need 2 no 10L-15 L 5 star rated which can handle the hard water.
    Regards
    Guru

    • Abhishek Jain

      You can look at these:

      15 lts models:

      Havells QUATRO 15
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts water heater.

      10 lts models:
      Havells QUATRO 10
      Havells OPAL 10
      Usha Aquagenie 10L
      Bajaj Majesty 10 GPU

  • Narayanan

    I am from chennai I have 10 lts water heater. I think its more current consumption. I want to change to solar water heater it is good or not. pls suggest.

  • Kunal

    I like to have longish showers 10-20 minutes and was thinking of getting a tankless geyser. Would the geyser give hour water for the entire duration?

    • Abhishek Jain

      It will be difficult for a tankless geyser to give continuous hot water for 10-20 mins.

  • mansi upadhyay

    Hi,plz tel me which one is best,tank or tankless geysers????

    • Abhishek Jain

      I would say that it will be best if you can go for the smallest tank geyser (6 lts/10 lts/15 lts) that can suffice your needs.

  • Sanjiv

    Hi,
    I am from Mumbai. We are a family of 6 and most of them have bucket bath. We had problems with our 20-year old “Mini Spherehot” instant water heater(in the past, had been repaired a few times for coil burnout, etc) and now that it’s out of order, would like to replace it with a new geyser. Though the domestic water supply pressure is moderate, it arbitrarily falls down to very low levels. We usually fill up about less than half bucket with hot water and then fill the remaining with cold water. Please recommend a suitable water heater(small).

    • Abhishek Jain

      I would suggest that you go for 6 lts water heater. You can look at these:

      Havells BUENO 6
      Havells QUATRO 6
      Bajaj Majesty 6GPU
      A O Smith HSE-SBS-006 or HSE-SAS-006

  • Anand

    Hi Abhishek,

    I am Pune, Maharashtra. Temperature in winters can go below 10 while in summers it might cross 40. I have a family of 4. There are 3 bathrooms in the house, two of which are connected to single water geyser connection. One bathroom is separate.

    For the separate one, I am planning to buy a 3 ltr instant geyser and I will look for options you suggested in other threads.

    My question is about the other two bathrooms with single geyser. One of the two bathrooms would be used daily while the second bathroom would be used rarely (only when guests come). Do you think an instant geyser would be okay for such an arrangement? If no, then can you suggest an adequate size of storage geyser? both of us using the bathroom daily would mostly have bucket bath. Once in a week would be shower bath.

    Plus, I also have a constraint of height of geyser as the space provided would incorporate approx. 300 mm height of the geyser.

    Please guide.

    • Abhishek Jain

      Hi Anand,

      Sizing of water heater should be done based on instantaneous requirement of hot water. If at any given time only one of the bathroom will be used then even a common instant geyser would work. If both will be used together then you would need about 25 lts water heater as instant water heater will not be able to give sufficient hot water for two people.

    • Anand

      Thanks for the reply Abhishek.

      Since one bathroom would be used rarely, I assume there is no point in heating 25 ltrs of water everytime. (thats what I gathered from other posts in your blog.)

      Now about instant geyser, I have two points:
      1. Since we take shower bath once a week, would the instant geyser be very inconvinient? Even with a higher capacity heating element?
      2. Some of my friends in the society experience higher energy bills, which they feel is because of instant geyser. But your blog says its not the case. Maybe their bills are higher because of some other reasons? (avg bill of 1200 per month without washing machine, oven etc.)

      Based on your inputs I will decide whether to go for an instant one or a 15 ltrs one.

      Would really appreciate your reply.

    • Abhishek Jain

      Hi Anand,

      The amount of hot water that you can get from instant water heater will remain the same be it for bucket bath or for shower bath. If you use instant water heater for shower, it will have to be a quick shower rather than a relaxed shower bath that one tends to have while using shower. It will not be inconvenient but will be short. Or it may get longer if you do not use shower at full force and higher capacity heating element.

      Also instant water heaters cannot increase electricity bills unless you leave it on for long and/or leave the tap on.

  • Daniyyel

    Hi Abhishek,

    I just bought the Racold Eterno DG 25L. It is a very slick geyser with tonnes of options – uniquely being able to set kW usage between 1/2/3. I needed some advice on what setting would be ideal for electricity savings.

    Assume the following to be true – initial water temperature in tank before heating is 20C, desired water temperature is set to 50C, and geyser will be switched on and off before bath. Keep in mind time needed to heat up isn’t an issue as far as inconvenience goes as it has an auto-start timer and I am the only user.
    a) 1kW (4 mins/deg) – geyser runs for 2 hours at 1kW to raise the temperature 30deg from 20C to 50C
    b) 2kW (2 mins/deg) – geyser runs for 1 hour at 2kW for the same scenario
    c) 3kW (1.5 mins/deg) – geyser runs for 45 minutes for the same scenario
    *The mins/deg numbers are from the manual and on basic observation (by keeping an eye on the LED display showing actual water temperature and noting it against a watch) I have noticed them to be fairly accurate.

    My question is assuming the above stated scenario, in terms of pure electricity savings, which is best? Run it at the lowest kW but for the longest duration, highest kW for the shortest time, or the middle ground.

    I hope this poses as interesting a mathematical question to you from a fellow energy geek!

    Your insight on this case and in general (that is varying start/stop temperatures, that is higher/lower differentials, etc) would be appreciated so that I may best make use of my new and very feature packed geyser (that is temperature setting, kW setting).

    Cheers,
    Daniyyel

    • Abhishek Jain

      Hi Daniyyel,

      Energy (Electricity) consumption will almost be the same in all the three cases because the volume of water being heated will be the same. There will be some heat loss from the surface but that will be insignificant in comparison to total energy used for heating. Even for that insignificant heat loss, the one that heats fastest will have lowest heat loss. So a 3 kW setting would be the best. You save energy as long as you do not waste hot water or leave hot water in the water heater.

    • Daniyyel

      That’s rather strange then for them to label their 1kW heating option as “Eco” mode.

      I’m afraid I may have made a mistake in purchasing this one as I was under the impression given that this was the only geyser that had the option to tune the power all the way down to 1kW, it would offer the best electricity savings.

      Just for my information, would say something like the new Havells 10L/2.5kW 5 star rated instant geyser have been a better choice? Would that sort of a “hybrid” (I say hybrid because of the comparatively larger tank size) work in Kolkata? Mean average lows in the coldest months are barrel below 15C. In the last few days of use I have observed initial water temperature in the tank to hover in the mid 20s.

      Now that I’m stuck with this one what do you suggest is my best course of action to achieve maximum savings? Run it on 3kW at a temperature of 50C and switch off before showering? Could you approximate (using the values I gave you) what kind of usage (in units) per day, assuming it runs once a day, I am looking at with this geyser?

    • Abhishek Jain

      Hi Daniyyel,

      The heating elements of water heater are almost 98-99% efficient, i.e. whatever energy they pull from source is almost completely used up for heating the water. So if you have a 10 lts water heater then to increase the temperature by 20 degrees would use: (10 x 4.2 x 20)/3600 = 0.24 KWH (or unit of electricity). A 3 kW unit will give this much energy in 0.24/3 = 0.08 hrs or about 5 mins. A 2 kW unit will give this much energy in 0.24/2 = 0.12 hrs or about 7-8 mins. A 1 kW unit will give this much energy in 0.24 hr or about 14-15 mins. A BEE 5 star rated 10 lts water heater would have standing loss of about 0.42 kWH (or units)/24 hrs or 0.0175 unit in an hour. So if you heat water with a 1 kW heating element and use it within an hour then on top of 0.24 units you may additionally use up 0.0175 units of electricity. If you heat using a 3 kW heating element then it will get heated up in 5 mins and if you use the water in another 10 mins then you hardly waste any electricity.

      So the rating of heating element is just to speed up or down the heating. The energy consumption will increase if you increase the volume of water to be heated or if you leave hot water in geyser (loss due to standing losses).

  • Shivraj

    Pls advise me for the selection of suitable Water Heaters/Geysers foe the use of family having 3 members only.
    Our average consumption of water as 15 Lit/person.

    • Abhishek Jain

      Which city are you in?

  • Sidharth

    Confused which type & size geyser to buy. We are a family of 4 assisted by two helpers. This geyser is for Kitchen & water will be used for utensil cleaning, mopping & water for two assistants to take bath. May be 1-2 bucket for gaurd & Driver. Please suggest which is the best buy. Thanks in advance

    • Abhishek Jain

      Which city are you in?

    • Sidharth

      I am in New Delhi

    • Abhishek Jain

      For your usage I think a 15 lts water heater should be good enough. You can look at these models:

      Havells QUATRO 15
      AO Smith HSE-VAS-015
      Havells PURO 15
      Bajaj Majesty 15 GPU
      Racold Eterno dg 15 lts water heater.

  • sharad

    We had 4 members family. Only I use showers. i need a water geyser for bathroom. Which size i should go for ?

    10L or 15L ?

    • Abhishek Jain

      You can go for 10 lts model.

    • sharad

      Does 10L will provide continuous hot water supply even if initial 10L got used ? if yes then how much Ltrs hot water i will get continous ?

    • Abhishek Jain

      A water heater typically heats water to a peak of 60 degrees (unless you adjust the thermostat). Which means if the incoming water temperature is 25 degrees, then 10 lts water will use up 10 x 4.2 x (60-25) = 1470 kJ of energy. Typically human beings can handle only up to 40 degrees hot water. So the amount of water that can be adjusted to 40 degrees with that about of heat is = 1470 / ( (40-25) * 4.2 ) = 23 lts.

      So if the incoming water temperature is about 25 then with 10 lts water heater you can get 23 lts of hot water at 40 degrees (which is decently hot). A regular shower bath takes up 25 lts (unless you are used to having long shower).

    • sharad

      Well said. Thanks a lot for your valuable support.

      What happens after 23L hot water ?

      i am confused between 10L and 15L as i heard more capacity takes more time like 15L takes 20min while 10L takes 12min to heat water

    • Abhishek Jain

      If the water heater is switch on, it will continue heating the water. But it will not be able to heat the water to temperature that you need. You will have to wait for it to heat the water to the temperature you need. Certainly 10L will take less time to heat, but the total volume of hot water (at temperature at which you need) will be less as compared to 15L water heater. However if you go for bigger water heater and leave hot water in it, the water will loose heat with time and in turn the electricity used for heating goes waste and thus we suggest going for smaller sized water heater.

  • Anil

    So what do you suggest? This article is basically talking about storage water heaters not instant water heaters.

    What do you suggest for instant water heaters?

  • Avishek

    Shall we shut down a geyser once we have enough water for future use? Or it is fine to keep the geyser on even after cut off is reached? Which one is better efficiency wise and what are the advantages/disadvantages of both? Thanks.

    • Abhishek Jain

      It is better to switch off the geyser once you have enough water for use. Keeping it on you would waste electricity in form of standing losses.

  • Geetansh

    I want to fit a geyser in my washroom, which is for small family – 4 persons. I can fit a gyser of physical size – length 3 feet. Could you please suggest which gyser would best fit in my requirement. Also please let me know the capacity, brand and model of your suggested geysers. Thanks for your help!

    • Abhishek Jain

      Hi Geetansh,

      Is the constraint height or length. If it is length then you can go for vertical models like Havells Quatro, A O Smith HSE-SAS/SBS/SDS/SES models, Racold Eterno/Altero models, Bajaj Majesty GPU models. If it is height then you can look at Bajaj GMH RF or CP models or AO Smith EWSH model.

  • Anuj Seth

    I do not afree with your point of switching off the Geyser. I have noticed if we keep the Geyser on it saves electricity. Because the water inside the geyser is still at higher temp. than the input water temp. So The energy used to heat that water to 60C will be less than what you will use next day.

    These day we get Geysers which have good insulation and keep water hot till next day will less electricity.

    • Abhishek Jain

      The most efficient BEE 5 star rated geysers also have standing loss. So with best of insulation there is loss of heat. It’s better to avoid that.

  • P.Srinivasakumar

    What can be the maximum efficiency of the normal geysers?

    • Abhishek Jain

      The energy efficiency of geysers is mentioned in kWH of standing loss per day. Which means the amount of energy it will loose in the whole day if hot water is left in the geyser. The numbers differ for different sizes of geysers. Smaller geysers have low surface area so the loss is less, bigger geysers have higher surface area so the losses are more.

  • Sander Vandenhaute

    Hi

    Do you have any detailed, statistical information on the (hot) water usage of an average indian household (so not just 5 en 10 liters but like 6.231 and 9.345)?

    Thanks

    • Abhishek Jain

      Hi Sander,

      We do not have those numbers.

  • anikethan

    If i have a solar water heater, and there is an overcast in rainy season, How should i route the water from solar system through the geyser and what type of geyser should I buy

    • Abhishek Jain

      Hi Anikethan,

      There are two types of systems available in market: 1) Hybrid: which is a pre-integrated system. 2) Simple solar water heater with no integrated electric geyser. However in the hybrid system, the hot water output from solar water heater is put in the electric geyser. Electric geysers have thermostat which shuts off the electricity once the water reaches a certain temperature. This ensures that water is always hot to a certain degree. Now if you want your solar water heater to be integrated to your geyser, you just need to ensure that the piping in your house is such that the hot water output from solar water heater goes into the electric geyser (which can be any regular electric geyser). If the water is hot enough, then the electric geyser will not consume any electricity (thermostat will keep it off). If water is colder then the electric geyser will heat it. So you just need to ensure that the piping is such that the water from Solar Water heater goes into the regular geyser.

  • KP 7

    good helped a lot.

  • vijay

    Very useful points.

  • Dnyanesh Bodhe

    Ver Very well written.. excellent initiative…!

  • aravikumar

    Excellent info guys. Very helpful & well-written. Keep up the good work.

  • Abhishek Jain

    Hi Anuradha,

    We wrote about solar water heater on one of our posts: http://www.bijlibachao.com/solar/solar-water-heater-system-how-can-it-save-energy-and-its-prices-in-india.html . Do check it out and let us know if you have more questions.

    Regards,
    Abhishek

  • anuradha

    Hi abhishek,
    Could you please tell me the cost saving a 100 litre solar water heater would give in a period of two years as compared to a normal geyser of 100 litre.
    Regards,
    Anuradha.

  • furnace Rochester NY

    This is really going to help me in the related stuff..thanks for the information

  • Piyush Agrawal

    Hi Abhishek, I have many questions related to all electric equipments that is required in hotel like T.V., A.C., Geyser, Fan, lights, invertor, batteries, solar power etc. Let me know if I can post my questions here / can email you / call you.

    Regards,
    piyush0101 @ yahoo . com

  • Piyush Agrawal

    I am starting a 2* hotel of 30 rooms. Can you please recommend which geyser is good & what should be the size. Based on my understanding after reading the article above, I think one geyser per room, storage type water heater & size of 10L, should be good enough.

    Regards,
    Piyush

  • krishna reddy

    What is Cp Used in calculating units? Is it specific to heater?

    • Abhishek Jain

      Hi,

      Cp here refers to specific heat of water and it is no where related to the heater. To calculate ideal units, you can use this simple formula:

      Ideal Units = Volume of Water x Temperature Difference x 0.0012

      Regards,
      Abhishek

    • krishna reddy

      Thanks Abhishek, Yours work is truly appreciated. As you said ideal units, few more units get added depending upon standing loss. Lets say I’m using 15lts Kenstar water heater, as you mentioned in some other article, How long does it take to get to 60c temperature(winter season) after I switch on. Standing Loss is loss one it’s heated and left being unused, am I right? What If I use heated water immediately after switching off heater, there wont be any loss right? would the above geyser automatic switches off once it reaches 60c? will it keep heating for standing loss, if I switch on?

    • Abhishek Jain

      Let me try to answer your questions one by one:

      1) Assuming that the temperature of cold water in winters is 20oC. The units needed to heat water will be 0.72 units (calculated using the formula mentioned earlier). Now if the water heater is rated at 2 kW (or 2000 watts) then it will take 22 mins to heat up, if the heater is rated at 3 kW (or 3000 watts) then it will take 14 mins.

      2) Your understanding is right, standing loss is heat loss once the water is heated and left unused.

      3) Your understanding is right that if you use heated water immediately after switching off the heater, there will not be any loss.

      4) Most modern water heaters have thermostat which will switch off the heater once the temperature reaches 60oC. But if you leave the water unused and water heater switched on for a long time, the water will loose heat (standing loss) and the temperature will come down and then the heater will start again to maintain the temperature to 60oC. So effectively if you leave the water heater switched on for the whole day, then the electricity consumed will be Ideal units for heating the water + standing loss.

      Hope this helps.

      Regards,
      Abhishek

    • krishna reddy

      Thanks Abhishek, That helps a lot. Keep it up.

  • sneha

    even using induction heater you can get hot water right ..???? then why geyser ?? geyser is more efficient than induction heater but in what way..????

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