Electricity Saving Tips For Homes And Offices

Choose the right sized water heater/geyser for electricity saving

By on April 22, 2016

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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223 comments

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1

I live in Bangalore and during rainy and winter seasons in the morning water from solar is not hot. Water from over head tank comes thru pressure pump & solar water heater(pressurized) to the bathrooms. I am looking for a water heater which is small in size for my bathroom as I don't have big space to install on the wall as the height is 8ft due to false ceiling. Seeing your recommendation of storage water heaters for bathrooms I am thinking of 15/10 liters capacity. Could you suggest on the capacity & fit in well on the wall elegantly. I checked horizontal geysers available in the market but their width is too long and are not aesthetically looking good.

Appreciate your input. Thanks in advance.

2
Abhishek Jain (Mod)

How much space do you have to fit in the water heater? Do you have about 1.5 ft x 1.5 ft x 1.5 ft of space to put the water heater?

3

We are a two member family living in Kolkata. What should be the ideal capacity of our bathroom geyser?

4
Abhishek Jain (Mod)

For bucket bath 10 lts is more than sufficient and for shower bath 15 lts is more than sufficient. I guess winter will not be too cold in Kolkata, so even a 10 lts would be good enough for shower bath and 6 lts for bucket bath.

5

I am already having a instant 6L Electric geyser but the issue is with hard water where the coil, indicators and storage tank is damaged due to scaling
Please suggest what type of geyser need to be used to avoid damage due to Hard Water and save energy

6

Thanks for reply, I need a clarification
To avoid damage due to Hard water, do the gas geyser will be resistant against scaling due to hard water
As my existing two geysers are of Racold Pronto 6L model where after usage of just for four family members in span of 5 years the coil and tank got damaged for one and coil got damaged for other one
if so please suggest good and robust model

7
Abhishek Jain (Mod)

Hi Smitha,

Gas geysers do not have coil as the water is heated in a heat exchanger using flames. But dealing with hard water is always difficult. It can cause scaling inside the body or the coil. You need to make sure that you drain and flush the water heater completely every 2-3 months. Or if you want to avoid that, then you will have to install a water softner before it. And this you have to do irrespective of the type of water heater (gas or electric). Hard Water contains minerals that get deposited inside the water heater and reduce its efficiency and slowly it will stop working. This deposition needs to be cleaned regularly.

8
Abhishek Jain (Mod)

6L is a good size to save electricity.

9
Abhishek Jain (Mod)

These days most good brands have very good corrosion protection (glass lining). All brands like Havells, AO Smith, Racold, Bajaj, V-Guard, Venus, etc are good. You can go for any one of them. You can look at the list of most efficient water heaters on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

10

Hi,
Planning to buy 2 25 litres geysers. I have been advised to buy one with copper tank whereas, many of the branded ones are coming with glass tank.
Can you please advise / guide me as to which brand and type of geyser to purchase. I live in the 4th floor and the water tank is the terrace above our flat.

Regards
Mahesh Eswaran

11
Abhishek Jain (Mod)

Hello Mr Eswaran,

We have written in detail about it on this link: https://www.bijlibachao.com/water-heaters/coating-storage-water-heater-thermoplastic-stainless-steel-enamel-coating-glasslined.html

Glass lining is for corrosion protection and better durability. Copper alone is not good. The branded ones like Havells, AO Smith, Racold, Bajaj, Venus, V-guard, etc are quite good. You can look at the list of most efficient water heaters on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

12

Dear Mr. Jain,

Many thanks for your prompt advise.
Visited the site you have mentioned. However, unable to choose the brand. All i know is that i require 2 nos of 25 Litres Geyser.
Would request you to kindly advise the brand and models to choose.
Regards
Mahesh Eswaran

13
Abhishek Jain (Mod)

You can look at any of these:

BrandModelAmazon LinkFlipkart Link
MORPHY RICHARDSLAVO EM25http://amzn.to/2g38KTi 
MORPHY RICHARDSLAVO DIGI25http://amzn.to/2gp16TH 
AO SMITHHSE-VAS-025http://amzn.to/2fuhV0U 
AO SMITHHSE-SBS-025http://amzn.to/2fIg8Tkhttp://fkrt.it/hHMWgTuuuN
AO SMITHHSE-SDS-025http://amzn.to/2gp0spthttp://fkrt.it/RW9n6!NNNN
HAVELLSQUATRO DIGITAL 25http://amzn.to/2fullk2http://fkrt.it/RWTyz!NNNN
HAVELLSMONZA EC 25http://amzn.to/2goYlC7http://fkrt.it/h9GtUTuuuN
14

Dear Sir,

Many many thanks.

Regards
Mahesh

15

Hi
Can you tell me the approximate difference of standing loss between an average 50L horizontal & 50L vertical water heater? It seems to me that it would be about 0.10 unit per day which will turn out to Rs 1 per day @ Rs 10/unit. And it is the maximum theoretical loss one can suffer if heated water is not used for 24 hours.

So am I right that in all practicality there is negligible difference between horizontal and vertical models regarding running costs?
I want to buy a 35. 40 Lheater with automatic timer on and timer off functions which will heat the water in the morning and then turn off. I will use this heated water over the whole day but mostly in the mornings itself.
How can star rating help or affect me in this case? Is standing loss the major criteria for star rating? Can I gor for major brands like AO Smith , Ferroli, Jaguar etc without troubling myself too much over star ratings and instead concentrate on features I need like horizontal heater, timers, capacity, quick heating etc?

16
Abhishek Jain (Mod)

Hi Neeraj,

Standing loss is an outcome of the insulation of the water heater. It does not depend on horizontal and vertical. Whichever design has better insulation, there will be less standing loss. And less standing loss means your water will remain hot for a longer time even after the water heater is switched off.

Electricity consumption of a water heater depends on 1) Volume of water you heat 2) Standing loss of the water heater. You can reduce electricity consumption of water heater by: 1) reducing or optimizing the volume of hot water you use or by reducing the temperature of hot water that you use 2) By going for a water heater with lesser standing loss 3) Switching off the water heater when not in use because due to standing loss the water temperature will drop and the heater will again start heating it if thermostat senses lower temperature than set.

If you go for a big water heater then you will heat the water, not all of it will be used in one go, water will be left standing in the water heater and there will be standing loss. That is why we usually suggest to go for a water heater that is good enough to produce water for single biggest use (be it bathing, washing hands, or whatever the use be). That way, you heat the water, use it immediately and do not let it stand in the heater to have standing loss. If you leave hot water in the heater for the whole day, it is bound to have standing loss. And in that case, going for 5 star rated heater will be important.

Timer options are good so that you do not leave the heater on for a long time accidentally. Because if you do, then water heater will keep heating water and hot water will keep loosing heat due to standing loss.

If you want quicker heating, then you will have to go for a water heater with higher wattage heating element. It will heat fast, but then it will also add to the total electic load in your house and you have to make sure that you are not exceeding the total sanctioned load on your electricity connection.

17

Hi,
I want to buy a 15lt or 20 lt geyser. We need only for 2-3 months in a year. Is there any geyser which has timer to set the time we want to set, let's say 10 mins and after that auto switch off. the geyser. This feature is needed for my aged parents. They might forget to switch off the geyser. I am not sure about whether there is any model from any company available or not. Please help.

Thanks,
Siva

18
Abhishek Jain (Mod)

Hi Siva,

You can go for something like Racold Eterno Intellio 15 lts water heater (Amazon link: http://amzn.to/2eND4Wm ). I think 15 lts should be good enough. This is a BEE 5 star rated model with good energy efficiency.

19

sir i want to buy water geyser for 4 member but our home have 4 bathroom and 2 kitchen every one have tap for hot water so its total have 6 so i want to buy good geyser which one good electrical or gas geyser or may be solar geyser and what is size of geyser and brad and low power consumption and i want to which one is good electric vs gas vs solar .

20
Abhishek Jain (Mod)

Hi Surya,

Best solution is a solar electric hybrid system. In such a system there is a big solar water heater (100-150 lts) which distributes water to all the taps. Additionally there is small instant electric geyser (6 lts in size) for each bathroom. Solar water heater will work on most of the days when there is decent amount of sunlight. If the solar water heater does not heat the water sufficiently, then electric geyser will take care of heating the rest. On days when there is no sunlight, the electric geyser will be used the most. This works as a perfect solution. To get list of good electric geysers you can check this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

21

sir this is good but sir have any option we can put one geyser of all of bathroom mean larg capacity geyser they can supply all over the bathroom because all bathroom uses different time not using same time . one time only one bathroom using so i want to know about one geyser because inside the bathroom hai single pipe line and the connect to solar geyser its open have connection to on rooftop included 2 kitchen .

22
Abhishek Jain (Mod)

You can put one solar water heater and take the output of the same to one single 25 lts electric water heater. The output from the electric water heater can be distributed to any number of bathrooms.

23

thank you siR

24

We are planning to move into a 3 bedroom apartment in Mumbai. We have 3 bathrooms and hence require to install 3 geysers. Bathroom 1 will be used by my dad who needs a bucket bath. Bath 2 will be used by my daughter who uses handshower. Bath 3 will be used by me and my wife (though there will be a time gap of over 1 hour between our bath timings). My bathroom will have a rain shower. I guess my dad will need a 10l storage geyser, my daughter a 15L storage and not so sure about me. Will it be 25 or 35 l. I was considering a.o.smith which allows temperature setting. Since you have mentioned that human body can bear temp of 37-39%, I was keen to have a geyser which does not unnecessarily heat up the water to 60 deg. are there any other brands/models that you recommend ?

25
Abhishek Jain (Mod)

In Mumbai, for bucket bath you can go for a 6 lts water heater. For small shower 10 lts is also sufficient. And for rain shower you will have to go for 25 lts. Go for a model that has an adjustable thermostat (on which you can change temperature). I would suggest that you check models from Havells, AO Smith, Racold. You can get a list of models on this page: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

26

Hey,

I have a multi shower system from Grohe and Artize. We are to install a water heater at our place and I had a boiler previously installed but its body failed. When asked the plumbing consultant, he said that a three phase line is essential for an inline geyser. I would like to know if it is actually required (the three phase line) or a single phase electric line can help in this situation.

These showers put out almost 20L/min at 6ps.

27
Abhishek Jain (Mod)

Hi Ishan,

Firstly, three phase is not required for a geyser. Geyser runs only on single phase. But I guess your consultant recommended three phase because if you go for an instant geyser, it will be 4.5 kW geyser and it will increase the total load in your house and usually if the total load in the house is more than 7 kW, then electricity distribution companies will suggest you to go for 3 phase.

To give you a analogy to understand it easily .... imagine you have a truck to run. You can easily run it on a single lane road. But then your truck will not be the only thing running on the road and there will be many other cars, etc (which all can also ideally run on single lane), but just so that there is no traffic jams, the truck will be advised to run on a 3 lane road.

An instant geyser is like a truck (a high electricity consuming appliance), and to keep other things running along with it (without a traffic jam), you need a bigger connection (a three phase connection).

Now having said that, I do not think any electric instant geyser can give you hot water at 20L/min. You will have to go for a storage geyser (I am not sure what you meant with inline geyser). For that flow rate you will need a 50 lts geyser. However, most 50 lts geyser available in market are max 2 kW or 3 kW. And they will take up good enough time to heat the water (atleast 30-45 mins). And you will have to keep the heater on much before the water will be used. If you go for 2 kW one then I do not think it will be very necessary for a 3 phase connection.

28

Hi Abhishek,
Thanks for giving detailed information. We are having single connection point for a geyser that will be used for 2 bathrooms. There are only 3 family members in the house who will be using bucket bath. I am planning to get a Racold 6 ltr Instant geyser. Do you think that will be sufficient or should I be going for a storage water heater of larger capacity?

Thanks in advance!!

29
Abhishek Jain (Mod)

Depends on how cold it gets in your city. I have a 6 lts geyser in one of my bathrooms and it works perfect for a bucket bath (a bit less for shower bath), and I am in Mumbai where temperatures are not too cold in winters/monsoons. If it gets too cold, then 10 lts water heater would be good.

30

Hello, thanks for all the information. I am trying to estimate power consumption of the following electric heater which is fitted in a 300 liters tank: The heater is kept switched on for around 8 hours. The wattage of the heater is 3kW. I do not know the water consumption details.

Is it possible to estimate the power consumption per day using only this data?
I am a bit worried due to the thermostat.

31
Abhishek Jain (Mod)

Hi Apoorva,

All water heaters are equipped with a thermostat. This is because if they do not have a thermostat then the water will keep on heating and will get converted to steam and that will burst the tank. So it will surely have a thermostat.

And as mentioned above the electricity consumption can be calculated using this formula:

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

Now suppose you heated the water from 20 to 40, then the electricity consumption would be 300 x (40-20) x 0.0012 = 7.2 units.

There would be extra electricity consumption that would be because the standing loss of the tank. And that depends on the insulation of the tank. If insulation is bad, then heat loss will be fast and the thermostat will sense that the water has lost temperature and it will start the heater again. Once it again senses that the water has reached the set temperature, then again it will switch off the heater.

The heater wattage just determines how fast the water will get heated. It has no impact on actual electricity consumption. That depends on the water volume being heated.

32

I got a 3litre geyser, what is it helpful with? Can i use it for bathing purpose? We are a family of 3 and have shower.

33
Abhishek Jain (Mod)

Instant water heaters are not good for showers. It will soon run out of hot water. May work ok for bucket bath depending on your city. If the city is too cold in winters, then it would not work. For places like Mumbai or Chennai, it may work. You can read more here: https://www.bijlibachao.com/water-heaters/should-you-buy-instant-water-heater-for-your-bathroom.html

34

Hi Abhishek

i stay at 7 floor of a 14 floor building is it advisable to buy geezers with pressure valves

35
Abhishek Jain (Mod)

Hi,

Pressure Valves are for safety of the geysers. In case the pressure inside the geyser increases, it will open up and release the pressure. If you think that the water pressure is really high then you can go for it. Most brands these days mention the water pressure that the models can handle. You may go for a model that can handle high pressure in case you feel that the water pressure is high in your building. In general for high risers, it is better to go for such models that can handle high pressure.

36

Hi Abhishek
Suppose i need 100 liters for a long shower at temperature of 40 degrees celcius, then what could be the best scenario assuming no standing loss/cost of investment

1) I install a 100 liter geyser and set 40C
2) I install a 50 ltr and set at 50C approx and mix little cold water
3) Just install a small geyser and set at highest setting and mix with cold water till i get 40C?

Also, does it take more energy to heat water from 40 to 60 than say, 20 to 40? I think 0 to 20 may be really bad.

37
Abhishek Jain (Mod)

Hi Veepul,

Energy taken to heat water from 0 to 20 will be slightly more than what it would take it to get it from 20 to 40, but it will not be a huge difference. It will be quite close as property of water just changes slightly with varying temperature. So for all practical purposes it could be assumed the same for the same temperature difference.

Now a larger geyser will have more standing losses and thus the best strategy is to minimize the size of the geyser. A geyser can heat water till 60-70 degrees and the best strategy is to get a geyser that can heat water to 60-70 and then you mix cold water with it to get water at 40 degrees.

Now suppose you need 100 lts water and temperature of incoming water is about 20 degrees. Then as per the formula above you need 2.4 units of electricity.

The same electricity can be used to heat water to 60 degrees, and the volume of that would be: (2.4/((60-20)*0.0012)) = 50 lts.

So if you need 100 lts water in one go then a 50 lts water heater would be sufficient. Assuming all the inputs mentioned above are right.

You can get a smaller geyser as well, but then shower will be difficult to use and you will have to rely on bucket. Because with a smaller water heater, you will have to reduce the flow rate from the tap so that heater gets enough time to heat the water to desired temperature.

38

I am only receiving 100V supply. Does my 2 KW geyser consume the same 2 units/ hour of electricity?

39

no 1 unit/hr. Less volt means less flow of current, current directly proportional to volt

40
Abhishek Jain (Mod)

A 2 kW geyser will always consume 2 units of electricity per hour irrespective of the voltage. If voltage is low, it will draw more current.

41

current = volt / Resistance. Here Resistance is fixed. Volrtage directly proportional to current. So less volt means less current flow.

42

this reply is wrong. he is not having basic knowledge of electricity

43

Sir if I will use a tranformer to step up the voltage will their be any effect on the electricity units consumed / hour or will it remain same 2 units/hour

44

increase voltage means increase in current, so quick heating and more heating. Watt = current2 x resistance. hence consumed watt will be more than 2 units/hour

45
Abhishek Jain (Mod)

There will be losses in transformer of about 2-3%.

46

And also please suggest me that should I use the transformer as the water will become hot quickly?

47
Abhishek Jain (Mod)

Why are you using transformer to heat water? You can heat water directly with an induction rod. Why do you need to transfer energy from one circuit to another to heat water?

48

Is induction rod a better option than electric geyser for low voltage(100V)?Will it save electricity?
And please guide me which induction rod to buy?

49
Abhishek Jain (Mod)

My bad. I did not go through the previous comments properly before replying to you. No Induction rod is not better than a geyser. For better efficiency you should go for a geyser only. Do check for the operating voltage of the geyser given on the model. If the operating voltage is about 200-240 then you do need a voltage stabilizer (or transformer as you say). If the operating voltage is less (and about 100V) then you cannot use the water heater at 100V. And yes, you will get better performance (faster heating) only when you use the geyser at right operating voltage as mentioned on the model.

50

Thanks
Can you tell me which voltage stabilizer will be good?

51
Abhishek Jain (Mod)

For 2 kW system you need a stabilizer that would be rated about 3 kVA. If you are in India then VGuard is a good brand.

53

Does that mean for 2KW transformer losses will be about 40-60Watt/hour?

54
Abhishek Jain (Mod)

Yes a 2 kW transformer would have about 40 W losses. In an hour 40 Watt would mean 40 Wh or 0.04 kWh or 0.04 units of electricity.

56

Hi Abhishek,
we are a family of four and need a electric water geyser for kitchen, in north India.
could we go for instant or 6Ltr geyser or any other you suggest.
Thanks,
Regards
Navdeep

57
Abhishek Jain (Mod)

Hi Navdeep,

In North India 6 lts geyser would be a safer option. Instant ones will not be good enough for slightly longer water usage (considering the fact that it gets too cold in winters). Had it been just hand wash, instant would have worked. But for kitchen usage where you may need it to wash utensils, I think 6 lts would be better.

58

I appreciate your efforts.

59

hi abhishek ,
i have family of 6 members and i need a electeric water geyser so could you pls suggest what type with tank or tankless and how much litres of water geyser i have to buy..... i dont have any knowledge about water geysers...

60
Abhishek Jain (Mod)

Hi Jai,

I would not suggest a tankless (or instant) water heater if you plan to use it for bathing purpose. Also a lot depends on the method used for bathing. In most cities in India a 10 lts water heater is good enough for bucket bath and 15 lts is good for shower bath. If the climate is hot (like in mumbai or chennai) even a 6 lts is good enough for bucket bath. Also if you prefer longish showers (which actually is not good for the environment :) ) then you can go for a 25 lts water heater. But then 10 and 15 lts are the safest choices.

As far as tank or heating element is concerned, I would suggest you to look for a brand that can give you longest warranty on each of these elements. For water heaters brands do mention warranty for tank as well as heating element as both of these can get damaged due to corrosion. They need to put good corrosion protection for these two.

If you want to know about different types of tanks and corrosion protection then you can read this post on our website: https://www.bijlibachao.com/water-heaters/coating-storage-water-heater-thermoplastic-stainless-steel-enamel-coating-glasslined.html

Most top brands: Havells, Bajaj, AO Smith, Racold, Morphy Richards, Venus, Ferolli, etc have good corrosion protection for tank and heating elements.

61

hi Abhishek,
You are doing a good job. Keep it up.
I want to buy a water heater for my new house with plumbing facilities for solar water heater also. We have never used water heater. And so Im new to this.
We use 3 different bathrooms simultaneously. We need 3 water heaters or one heater that may supply to 3bathrooms.
We use hand shower rather than head shower. Sometimes bucket bath.
Kindly suggest a water heater

62
Abhishek Jain (Mod)

So here is the thing and this is what I suggest to most people: size of water heater does not depend on number of people or number of bathrooms. It depends on the maximum volume of water to be used in one use. From one use I mean in a bathroom it would be one person taking a bath. If the water heater is to be used for bucket bath then 10 lts water heater is sufficient in most (99%) cases in India. In places where the climate is not too cold (like mumbai or chennai) even a 6 lts one would be good enough for bucket bath. For shower bath 15 lts water heater is sufficient. Because after mixing with cold water, you get sufficient water for one person to take a bath. And by the time next person goes in, it becomes hot again (assuming the time difference between two use is about 15-20 mins ... which is mostly the case).

In most cases bigger ones are no good if you want to save electricity. Sometimes people think that they can have one single water heater for multiple bathrooms, but from an energy saving point of view, smaller water heaters for individual bathrooms is better.

Now if you plan to go for solar water heater then that would be the best thing to do. You can have a hybrid system installed where the water is originally heated in a solar water heater and then it goes to individual bathrooms where there are individual heaters which can heat the water just in case the water is not hot enough. That can save you a lot of electricity. You can go for a 100 lts solar water heater that is connected to all the rooms where you need hot water.

You can have a look at the top most efficient water heaters on this page on our website: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

Brands like Havells, Bajaj, AO Smith, Racold, Venus, Morphy Richards, Ferolli are good.

63

Thanks for your immediate reply. Your suggestion was useful.
The link you specified has only electric heaters.

64
Abhishek Jain (Mod)

We do not have data on Solar Water Heaters right now. When we have it, we will publish the same.

65

Hi, I just bot a new vguard 6 ltrs storage geyser for a family of 3 for bathing using bucket however after initial cut off (after 25 mins) it only gives less than half bucket hot water. Even if i mix it with cold water to fill the bucket, the water becomes cold. I have to wait for next cut off for about 10 mins for more hot water. It is not hitting instantly. What are my options to achieve best of it

66
Abhishek Jain (Mod)

6 lts would typically be less than half bucket. Which city are you in? In cities with extreme cold climate, a 10 lts water heater is a safer option for bucket bath.

Do you have a knob on water heater to change the heating level? If yes then try to keep it at the hottest level. If not then it will be difficult to use this water heater.

67

Thank you Abhishek. The model is sprinhot and im not sure if there is a knob for setting the temperature. Is there a way to atleast get continuous hot water after initial cut off? Or any setting which can be done on the mixer tap?

68
Abhishek Jain (Mod)

You can slow down the flow rate of water from the tap. Slow flow rate may most likely get you continuous hot water. But as I said, 6 lts may turn out small especially if you are in a city where the climate is very cold (like Delhi or most parts of north India). 10 lts model is better in case you are in North.

69

In my city ground water is hard then which geyser should I buy...... Water hardness will effect geyser????..... Plz write some model no for hard geyser......

70
Abhishek Jain (Mod)

It will be important to decide the right size before buying. A 10 lts would be good for bucket bath and 15 lts for shower bath. You can check the list of top efficient models on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

Havells, AO Smith, Racold, Bajaj, Morphy Richards, Ferolli, Venus are some good brands.

71

I am considering a water heater tank size for shower of: 3 litres, 15 litres or 25 litres for a flat in Tamil Nadu. Heaters under consideration are 2kWh units. If water has to be heated from 25 deg. C to 60 deg., how long time in advance would one have to turn each unit on in advance?

72
Abhishek Jain (Mod)

If you use the formula given above you need

0.126 units of electricity to heat 3 lts water
0.63 units of electricity to heat 15 lts water
1.05 units of electricity to heat 25 lts water

A 2 kW heater gives 2 units of electricity in 1 hour. So to heat the water it will take

(0.126/2)x60 = 3.78 minutes to heat 3 lts
(0.63/2)x60 = 18.9 minutes to heat 15 lts
(1.05/2)x60 = 31.5 minutes to heat 25 lts

Now suppose you need 15 lts hot water at temperature of 40 then you cannot get it in 3.78 minutes using 3 lts water heater. If you mix 12 lts of cold water to 3 lts hot water, the temperature will be lower than 40. You will have to keep it on for some more time to get 15 lts.

73

Thanks for the answer. Now, Let us assume that I spend 10 minutes for a shower, that I spend 20 litres and that I am a waterhog, leaving the water running all the time. Let us also assume that 40 C is a good water heater exit temperature, allowing for some cooling on the way from the tank to the (dirty) skin.
Then the water must be running at 2 litres/minute. Warming up from 25 C to 40 C as per the formula = 0.36 units/minute or 0,36*60 kWh= 2,16 kWh. So, a 2kW unit can (almost) keep up, warming the water as it flows through.
The 3 liter tank will be ready with 40 C water after (40-25)/(60-25)* 3,78 minutes = 1.62 minutes, the 15 liter will be ready after 8.1 minutes and the 25 liter ready after 13.5 minutes.
So, if I got it right, it is silly to go for larger size than 3 liters. Unless my assumptions in the first paragraph are unrealistic. Would you comment on this?
Thanks, PeP

74
Abhishek Jain (Mod)

Assuming that you need 2 lts per min of water. You need:

2 x (40-25) x 0.0012 = 0.036 units/min

A 2 kW heating element will give 2 x (1/60) = 0.033 units/min.

which will make the water heater mostly work in your case. However, 2 lts per min is very slow flow rate. A typical tap has flow rate of about 6-8 lts/min or more. Also water temperature of 25 degrees will not be there in every city (it will mostly be in warmer places).

We have done some analysis on this and published it on this page: https://www.bijlibachao.com/water-heaters/should-you-buy-instant-water-heater-for-your-bathroom.html

It is always better to go for the smallest possible water heater. If you get water at 25 degrees then even a 6 lts water heater would work ok (I have one in my house in Mumbai and it works fine). Though even with 6 lts water heater it is difficult to have longish showers (5-10 mins is fine). 10 lts is good enough even for longish showers (although from an environment perspective it is great that people do not have longish showers :) ).

75

Thank you gain for excellent, theoretically grounded, but practical advice that I have enjoyed as so many others, not only regarding the present issue (water heater dimensioning), but earlier also on A.C.s, fridges, inverters, stabilisers and other appliances. In cyberspace, where there is really no quality control of the advice being offered, your site and your advice stick our above most other web sites.
Wishing you success, - /PeP, Chennai

76
Abhishek Jain (Mod)

Thanks for the good words. I am glad that you found the information useful.

77

what is the actual power consumption of Havells 3L 3KW Neo EC Instant Geysers

78
Abhishek Jain (Mod)

If you ask about instantaneous power consumption then it is 3 kW. But actual power consumption will depend on the volume of water heater and also a bit on the time for which it is kept on.

Wattage is like Speed. So 3 kW is the rate of electricity consumption.

Units consumed (or kWh) is like distance. Depends on how long and how fast you use something.

79

Hi, We are only two adult members in family and lives in Delhi. I want to install storage water heater with TEMPERATURE CONTROL facility for bathing by bucket. Can you please suggest capacity of water heater ?

80

Hi, We are only two adult members in family and lives in Delhi. I want to install storage water heater for bathing by bucket. Can you please suggest capacity of water heater ?

81
Abhishek Jain (Mod)

10 lts water heater should be good enough for your needs.

82

I want to buy a water heater for home. We are 4 people(3 adults and 1 kid).I selected Reconnect RHWHE1502 Instant Water Heater, 15 litres.. Is it good? Can you recommend ?

83
Abhishek Jain (Mod)

As you have asked about a specific brand, then I will just copy and paste a reply that I have given to someone else in the past:

Since there is a huge demand for cheap products in India, there are many companies that are importing cheaply manufactured products from China and putting their own brand name on them and selling it in Indian market. They are not the OEM (or Original Equipment Manufacturers). Most electronic retail stores have such brands like Future Group has Koryo, Reliance has Reconnect, Vijay Sales has Vise, Croma has Croma. These guys are not OEMs but they are just importing from china and putting their name (brand). If you want to buy them, you can buy them at your own risk.

84

Then which one should I go for ?

85
Abhishek Jain (Mod)

Havells, Bajaj, AO Smith, Racold, Morphy Richards, Ferolli are some good brand .... You can check the list of top most efficient water heaters on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

86

Hi i'm looking for Gas geyser with Auto off and Auto overheating protection - we are the family of 4 + 1 kid.
kindly suggest the best Gas geyser to buy.

87
Abhishek Jain (Mod)

Almost all top brands have gas water heaters these days. You can check Bajaj, Havells, AO Smith or Racold gas water heaters.

88

Hi we are looking for geyser for 2 people. We stay in Hyderabad and it's v.cold now.What capacity is better for shower? Which brand ?

89
Abhishek Jain (Mod)

Hi Pallavi,

A 15 lts water heater should be good for your needs. You can look at the list of top most efficient water heaters on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

As far as brand is concerned, AO Smith, Havells, Bajaj, Racold, Venus, Ferolli, Morphy Richards are good brands.

90

Thank u for ur quick response. What about v guard?

91
Abhishek Jain (Mod)

Hi Pallavi,

VGuard is also a good brand. The most important thing with water heaters is that you should switch it on before use and switch it off immediately after the use to make sure it does not waste electricity. As long as you get a decent brand and use it right it would work out good.

Additionally if you want to control electricity consumption then buy a water heater with external thermostat using which you can reduce the heat level of the water. Lower the temperature setting, lesser will be your electricity consumption.

92

I have installed a 1ltr 3000w insta geyser of USHA in my flat. However it shuts down itself and the whole power supply after being switched on for 5-10 seconds. Since then I have not been able to use it
My friend in the same society (same building) has a 1ltr 3000w bajaj insta geyser and he has been using it without any issue. We both have the same 3Kv power supply. I tried switching off all the appliances including the refrigerator but in vain. Any solution Abhishek?

Thanks in advance!

93
Abhishek Jain (Mod)

Ask your electrician to check the capacity of the circuit breakers in your house. The wiring/Circuit Breakers in your house are not able to handle the load of the instant geyser. Your electrician should be able to help you.

94

Hi, i was looking for instant water heaters for my bathroon in pune for bathing purposes, we are a family of 5, but was confused with 1ltr, 3ltr and 6ltr variety. how does the capactiy affects the energy consumption.

95
Abhishek Jain (Mod)

By the way as mentioned on this article above, electricity consumption does not depend on the size of water heater. It depends on the volume of hot water you use.

96
Abhishek Jain (Mod)

Instant Water Heaters are not good for bathing purpose. I would suggest that you read this: https://www.bijlibachao.com/water-heaters/should-you-buy-instant-water-heater-for-your-bathroom.html

97

I want to go for 6L 500W geysers to make good with not using gas geyser. No doubt I have to wait for water heating. We are 4 persons. We are living in a moderate temp and 6L per person is sufficient. How much power consumption will be there? Pl let me know

98
Abhishek Jain (Mod)

If we assume that the temperature of water on the tap is about 25 degrees and you heat it to 65 using the water heater (assuming that you will mix it with cold water while using it .... and 65 degrees is the temperature to which your water heater heats the water), then the amount of electricity consumed would be:

6 x (65-25) x 0.0012 (formula give above on this page) = 0.288 units of electricity per person.

For 4 people it would be 4 x 0.288 = 1.152 units.

There will be some losses as well but that will not be more than 0.1 unit per day. So you would consume roughly 1.25 units per day.

99

Hello Abhishek,
I am from Vadodara (Guj). We are family of 4 members. I have selected two model (6 liter, for bucket bath) of Electric Water Heater. one is Haier Quadra ES 6V Q1 6-Litre & AO Smith HSE-SBS- 006 6-Litre 3000-Watt. Haier model comes with incoloy heating element, PUF insulation. on other hand in AO Smith model comes with Glass coated heating element & Blue diamond glass lined tank. Please suggest me, which model will be right choice for me as I am confused on Heating element & tank coating/Insulation.

100
Abhishek Jain (Mod)

Both have good corrosion protection and insulation. Both are giving similar warranties. AO Smith model is more energy efficient and AO Smith is a better brand for water heaters. So I think you should go with AO Smith model.

101

Thanks for your advice and quick response. your suggestion means a lot.

102

Hello Abhishek,

I am looking geyser for 1 person/ 1 bathroom only and it is for showers only .Can you pls guide me .. My budget is below 5k.
I will blindly buy whatever you suggest as I saw your blog is very informative.

Regards
Harsh

103
Abhishek Jain (Mod)

Hi Harsh,

Which city are you in? Because in place like Mumbai a 6 lts water heater may suffice, but in Delhi it may fall short.

104

Noida .. If you can share the link i will buy .. really appreciated .. thanks

105
Abhishek Jain (Mod)

In Noida a 10 lts model would be better. I could not find a reputed brand in your price range. The only one that I could find on Amazon with good rating was this one: http://amzn.to/2eZ1DcG .... But I am not sure about the brand.

106

Hi,
I am moving to a new home. My flat has 2 bathrooms, one is common and other is attached to the master bedroom. We are 2 members, but sometimes parents/siblings visit our place. The attached bathroom has solar supply. I like to have warm showers. Plz suggest appropriate Geyser/s
I am planning to buy a 3 ltr. geyser. Will that be sufficient?
Is 10/15 ltrs geysers (price almost the same) really required?
I want geyser which will fulfill my need - price & electricity efficient, Durable, Reputed, ideal for showers.

107
Abhishek Jain (Mod)

When you say Solar Supply, you mean hot water supply from solar water heater and you want a new geyser to heat water if hot water from solar is not sufficiently hot? If that is the case then 3-6 lts water heater should be good enough as it will just supplement solar water heater.

For other bathroom 3 lts may not be sufficient. See here is the challenge, a 3 lts water heater can just store 3 lts water. It may have a 3-4kW heating element to heat water, but once your 3 lts are over (obviously mixed with cold water), then the next volume of water that flows in does not get sufficient time to heat up well. So you will not get a continuous flow of hot water. A lot also depends on temperature of water incoming to the geyser. If it is not too cold, then it will heat up fast, but if it is cold, then you won't find it comfortable to take a bath. So if it acts as a supplement to solar water heater, then it may work depending on the temperature of water coming from solar water heater. But for standalone, it may not be sufficient for bathing. Typically, if you use bucket you use about 10-15 lts of water (size of a typical bucket) or if you take shower then you use 15-25 lts. So depending on the climate of your city a 6-10 lts water heater will be sufficient for bucket bath and 10-15 lts is sufficient for shower. Please note, if the climate is too cold then be on the higher side.

108

We are 2 members and we live in hyderabad. We already have solar water heater for complete apartment so i am mainly looking for water heater in winter and rainy seasons. We use bucket bath mostly. I am thinking about 6L instant or 10/15L storage in Racold. What you will suggest wrt durability and life and energy effecient. Which one will be good choice instant or small storage.

109
Abhishek Jain (Mod)

Hi,

6L water heaters are not classified as instant. They are classified as storage. Only 1 and 3 lts models are classified as instant. You can get list of top models of storage water heaters on this link: https://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

For bucket bath 6 or 10 lts models would be more than enough.

110

We are 3 members in Jamshedpur. Use of water for bathing and morning time brushing.. What will be your recommend size and brand of geyser which is value for money? Please help me.

111
Abhishek Jain (Mod)

Depends on what you use for bathing: bucket or shower. For bucket bath, 10 lts water heater is good enough and for shower 15 lts is better. You can look at top models on this link: http://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

112

I am setting up a resort in Shimla, where hot water will be required 24x7 for about 8 months. The guest rooms are spread out in small cottages over a large area of land. As a result a centralised heating system will probably not work. So how best do I heat the water for a 24x7 hot water supply? We need to plan for guest rooms having 2/3 adults or 2 adults with 2 children, all having shower baths. I am thinking of using storage electric geysers, but cannot decide on the size. Would it make sense to use 2 geysers in each bathroom - say a 35 litre main geyser with a 15/25 litre auxiliary geyser. When the room is occupied by only 2 guests, only the main geyser is switched on, and when there are extra guests in a room, the auxiliary geyser is also switched on. I have also considered AOSmith heat pump geysers but they are costing about Rs 65,000 each for a 60 litre geyser. I think the payback period is almost 20 years. Another point to be kept in mind is that in winters, the tap water is bitterly cold, close to freezing. Would greatly appreciate your advice. Many Thanks.

113
Abhishek Jain (Mod)

Hi,

Each individual will not need more than 15 lts of hot water even if they use shower. I think 30-35 lts should be more than enough as the water will get heated by the time 3rd person comes in for bath. I do not think you would need an auxilary geyser. You can try putting one 35 lts in one bathroom and do an experiment for 2-3 people taking bath immediately one after another. Try it in one room and then if it works then fit similar setup in all of them.

114

I suggest you to install solar water heater as feed water to your geyser- individual or common depends on the distance between cottages. Which will redue your eb bills by more than 65%. The payback period for geyser will be around 2to 3 years. - Prakash, Ooty

115

Ours is a two storied house with a single point for geyser on the terrace connected to 3 bathrooms - 2 bathrooms on 1st floor and 1 ground floor. We are 6 members. What capacity of geyser do you suggest? Also horizontal or vertical, was looking at AO smith

116
Abhishek Jain (Mod)

Because you have 3 bathrooms connected and it is possible that all of them may get used at any given time, it is better to go for a 50 lts geyser for this (assuming 15 lts is needed for each bathroom at any given time for shower bath).

117

I am planning to buy a Morphy Richards Lavo EM-6 for a family of 3 in Chennai. We take only bucket baths and only during winter. Will that be a good choice? Or would you suggest going for a different brand or a bigger capacity?

118
Abhishek Jain (Mod)

6 lts should be sufficient for chennai in winter if you prefer bucket bath. I have a 6 lts model in my bathroom in Mumbai and it works fine for bucket bath or short shower. Climate in Mumbai/Chennai will not get too cold in winters, so 6 lts should be sufficient.

119

Thanks Abhishek. Should I go with Lavo or Salvo? I couldn't find much details on the make of the two. Would like to have your opinion.

120
Abhishek Jain (Mod)

6lts is too small. From an energy consumption point of view the choice will not make much of a difference. Go for one that gives you flexibility to change water temperature as you can reduce your electricity consumption by reducing the water temperature from the geyser.

121

I am using pressure pump to send water to the bathrooms. So, what options.do we have in geysers that will work with the pressure pump. It is for two persons use in each bathroom.

122
Abhishek Jain (Mod)

You will have to check for the pressure tolerance level of a geyser before purchase. Many are designed to handle high pressure as in high-rise buildings, water pressure is usually high.

123

Hi Abhishek ,
I would like to buy a geyser for my home located @OOTY. Please answer me on these
1) Storage or instant which is preferred ?
2) What happens if we forget to turn off the switch
3) Bajaj or havells which service is recommendable.

Thanks in Advance.

124
Abhishek Jain (Mod)

Here is my response:

1) If it is for bathing, better go for storage. Electric Instant will not heat up fast enough. If you want instant then better go for gas geyser.

2) If you forget to turn off the switch, when water reaches set temperature, thermostat switches it off. But during the day, water looses heat and cools down and themostat again senses it and switches on the geyser. The process continues.

3) Depends on service at you local level. Cannot comment which one is better.

125

i wish to buy instant water heater...i dont understant which to buy....1L ot 3L...also which brand is good....havells or bajaj?

126
Abhishek Jain (Mod)

If it is for a tap on wash basin, then go for 1 lts. Else if you want more hot water, go for 3 lts. I think Havells is better.

127

Hi, I am confused between Havells Monza 15 ltr, Kenstar Aquafresh 15 ltr and Kenstar Jacuzzi 15 ltr. Could you help me choose the best among these? Is there any other heater which would be best in 15 ltr category? I have heard negative reviews about Kenstar servicing.

128
Abhishek Jain (Mod)

Havells has more energy efficient and feature rich models. So I would suggest Havells to you.

129

Thank you for the quick response!

130

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.

131
Abhishek Jain (Mod)

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

132

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

133
Abhishek Jain (Mod)

Depends on what you use and if you have LPG without subsidy, then going for gas would be very expensive. You can go for a 10lts water heater or even a 6 lts water heater with higher kW rating. You can look at the 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

134

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.

135
Abhishek Jain (Mod)

Hi Srikanth,

In general a 10 lts water heater is good enough for bucket bath and 15 lts is good enough for shower bath. You can look at the top models on this link: http://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

136

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

137
Abhishek Jain (Mod)

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.

138

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

139
Abhishek Jain (Mod)

You should go for a 15 lts water heater. You can look at the top most efficient ones on this link: http://www.bijlibachao.com/top-ten-appliances/best-water-heaters-geysers-brand-in-india-by-standing-loss-and-size.html

I think the ones from AO Smith, Morphy Richards, Ferolli or Havells would be really good.

140

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

141
Abhishek Jain (Mod)

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

142
Abhishek Jain (Mod)

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

143

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

144
Abhishek Jain (Mod)

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.

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