Average Water Heater Size – Choosing A Water Heater Sizes

You have recently seen the purchasing guide for the 15 best water heaters in IndiaDoes size matter? Yes, it does. What should be t

he average water heater size guide? It depends on the number of individuals using the geyser.

If people use the toilet one after the opposite and spend 15 to 25 litres of water, a 15 litre or 25-litre geyser should be the perfect one, mainly if you belong to the southern a part of India where the input water temperature isn’t very low. If you go north, the temperature of the input water goes down drastically. Hence, you’ll need nothing but a 25-litre geyser.

You might be having two bathrooms. Under such circumstances, you’d require double the capacity as two people might use the toilet together.

Does this practice out the 6 litre and 10-litre geysers? No, it doesn’t. You’ll still use the smaller geysers, except that they take an extended time for heating the specified water.

water-heater-capacity by FKC


What, then, is that the ideal size of a geyser?

A perfect size is one which will generate enough predicaments for max instant use. You recognize your family better. Calculate the quantity of water required from the knowledge given within the previous article.

Note the following points once you wish to understand the perfect choosing a average water heater size for your house, hair salon, parlour, Hotels, etc…

  • A smaller tank entails that you get less predicament that you need.
  • A bigger tank may result in wasting water and electricity thanks to standing loss.
  • For the perfect size, you’ll ask the dimensions calculator shown below.
Size of FamilyManner of intended useGeyser TypeIdeal Geyser capacity
2 to 3 membersBathing – bucketInstant6 litres
2 to 3 membersBathing – bucketStorage10 to 15 litres
2 to 3 membersBathing – ShowerStorage15 to 25 litres
2 to 3 membersWashing utensilsInstant1 to 3 litres
4 to 8 membersBathing – bucketStorage25 litres
4 to 8 membersBathing – ShowerStorage25 litres
4 to 8 membersWashing utensilsInstant1 to 3 litres

Space is vital

The average bathroom is little. During this age of attached bathrooms, there’s far less space. Hence, the moment geyser is best fitted to such bathrooms. The storage geyser has used only you’ve got more room.

Longevity of geyser

It depends on the sort of water ready. Many places in India have a high percentage of salt. Hence, you’ll expect to scale to occur. It will reduce the lifetime of the coils.

In the ordinary direction, instant hot-water heaters last longer than the storage ones. The primary reason is that storage geyser water heaters can crumble. However, with the straightforward availability of spare parts, you’ve got geysers lasting for quite 20 years.

Want to know the exact average water heater size you need?

Do this…

1. Learn which hour during a usual day is your busiest “hot-water-using-hour”.

To calculate the exact or average water heater size your household needs, you need to first calculate your “peak hour demand”.

Peak hour demand refers to the maximum volume of hot water you need (measured in gallons) during the busiest hour of your average day.

Keep in mind that showers typically use the warmest water of all hot water pursuits/appliances. That being said, if everyone in your household typically showers in the morning your “peak hour” is most likely during this time.

2. Use the chart below to add up the gallons of hot water you need during this hour.

Once you’ve learned which hour is your peak hour, a study of all the hot water activities you would normally fit into that specific hour.

Then, use the chart below to calculate your estimated peak hour demand:

how_to_size_water_heater3. Get a water heater that has a “first-hour rating” in 1-2 gallons of your peak hour rush.

All water heaters have an FHR (first-hour rating). This number means the number of gallons of hot water the unit can provide in a single hour, starting with a full tank of hot water.

So, essentially, if your FHR and peak hour demand match, your geyser will meet your hot water needs.

If you’re on a manufacturer’s site, you can find a water heater’s FHR either under the “terms”, “features” or “performance” section (see below).



If you’re looking at the water heater tank itself, you can find the FHR listed in the top left corner of the Energy Guide sticker. It will be noted as the “Capacity (first-hour rating)”.


Advantages of Choosing the proper size of Geyser/ Water heater

Choosing the proper size shouldn’t be a drag for anyone after browsing this text. The benefits of selecting the optimum size are many. Allow us to check out a number of the in short.

  • You save the energy within the sort of electricity consumed.
  • You save time because the water heater sizes are going to be at an optimum temperature in the least times.
  • As you run your geyser for the proper amount of your time, you increase the longevity of the appliance.

You have just seen the buying guide also because of the optimum size of the geyser for your family. We shall now proceed further and compare the moment geyser with the storage geyser as far as power consumption cares.

It will offer you the proper idea about the sort of geyser to put in in your house. You had seen the comparison of space during this particular article. Allow us to move ahead with the comparison within the next article.

Source: basc.pnnl.gov, plumbingtoday.biz,

Related Posts

3 thoughts on “Average Water Heater Size – Choosing A Water Heater Sizes”

  1. This is awesome article thank you for sharing with us.
    Water retains us hydrated and increases our immune system but impure water is damaging to our health. Bioglobe offers the best purifier system for Clean and safe drinking. Our system does not kill ionized calcium and other essential, beneficial minerals. For any suggestion for buying water filter, then you can get in touch with us today.


Leave a Comment