Water Heater Size Chart

Choosing the right water heater size is very important as this can affect the purpose of using a water heater and the monthly electricity bill.

There is no direct way to tell what water heater size is perfect for your family as there are multiple factors involved. This Water Heater Size Chart is our try to provide you with an easy-to-use tool to find out the right water heater size based on different common factors.

Why Do We Need A Water Heater Size Chart?

If you buy a water heater that supplies less water than required, it will spoil the purpose of using a water heater.

On the other hand, if you buy a water heater that supplies more water than required, you will end up wasting more electricity and an inflated monthly electricity bill.

water heater size chart

That is why, you must understand the requirements, choose how many members will use the water heater, for what purpose you need a water heater, and then make a decision.

Factors That Affects The Water Heater Size Decision

There are multiple factors that you need to consider before you decide on a water heater. Our chart also considers most of the points mentioned below.


If you have less space, then there are no options except to choose an instant water heater with a 3-5 liter capacity.

Storage water heaters are generally in the range of 10-30 liters capacity and occupy more space. So if space is important for you, stick to 3-5 liters of instant geysers

Family Size

For a small family size of 3-4 members, instant water heaters having up to 5 liters capacity is more than sufficient considering you will not use a shower as a shower consumes a lot of water and a 5-liter water heater can not serve hot water to all 3-4 members.

For showers, you need to use storage water heaters of at least 10 liters capacity.

Time Consumption

If you need instant hot water, then 3-5 liters capacity instant water heaters are the best. The benefit of having instant water heaters is that you do not have to wait as they have neon indicators that let you know when your hot water is ready.

For storage water heaters, you need to wait for at least 10 minutes to get hot water.

Intended Use

Water heaters can be used for taking a bath, or shower, or even for washing utensils. You need to decide what is the purpose of using a water heater.

For baths using buckets, a small capacity water heater is sufficient. But if you plan to take a shower, you need a higher-capacity geyser. So compile your requirements first and then decide on the water heater size.

Water Heater Size Chart

Here is a simple chart showing different water heater sizes based on different use cases.

water heater size chart
Credit: Crompton

Advantages Of Using This Water Heater Size Chart

  • You will never run short of hot water as you have chosen the correct size water heater
  • You will get a predicted electricity bill without any surprise
  • You will waste less power
  • Improves the longevity of the water heater

FAQ | Water Heater Size Calculator

What Water Heater Size Do I Need For A Family Of 4?

Water Heater Size depends on many factors. So it is difficult to conclude the size without knowing your requirements.

If we consider a very common case scenario of a 4-member family, then an instant water heater with 5 liter capacity is enough considering you are taking a bath using a bucket.

Shower wastes a lot of water. So if you plan to take a shower, then you need a storage water heater of at least 10 liters capacity.

Rajib Is The Founder And The Key Brain Behind RiansDeal. A NIT 2004 Graduate In Mechanical Engineering With Close To Two Decades Of Experience In Designing Large Appliances And Consumer Electronics Products.


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