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    Water Heater Size Calculator | Geyser | 6, 10,15,25,50 liters – What size do I need?

    An ideal size is one that can generate enough hot water for maximum instant use. You know your family better.
    Srinivasa ChaithanyaSrinivasa ChaithanyaUpdated:20 Mar, 202511 Feb, 2025
    water heater size calculator
    1 Member
    1 Bathroom

    How to use Geyser size calculator

    1. Use the slider to select Number of Members in Family

    2. Select the Manner of Intended Use

    • Bathing Bucket
    • Bathing Shower
    • Washing Utensils

    The ideal Geyser Size will be Displayed

    If people use the bathroom one after the other and consume say 15 to 25 liters of water, a 15 liter or 25-liter geyser should be the ideal one, especially if you belong to the southern part of India where the input water temperature is not very low.

    If you go north, the temperature of input water goes down drastically. Hence, you will need nothing less than a 25-liter geyser.

    You might be having two or three bathrooms. Under such circumstances, you would require double the capacity as multiple people might use the bathroom simultaneously.

    Does this rule out the 6 liters and 10-liter geysers? No, it does not. You can still use the smaller geysers, except that they take a longer time for heating up the required water.

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

    An ideal size is one that can generate enough hot water for maximum instant use. You know your family better.

    Note the following points when you wish to know the ideal size of water heaters for your house.

    • A smaller water heater tank entails that you get less hot water that you need.
    • A bigger tank can result in wasting water and electricity due to standing loss.
    • For the ideal size, you can refer to the size calculator shown below.
    Size of FamilyManner of intended useGeyser TypeIdeal Geyser capacity
    1 to 2 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 important

    The average bathroom is small. In this age of attached bathrooms, there is far less space. Hence, the instant geyser is best suited for such bathrooms. The storage geyser has use only when you have more space.

    Longevity of geyser

    It depends on the type of water available. Many places in India have a high percentage of salt. Hence, you can expect scaling to occur. This can reduce the life of the coils.

    In the normal course, instant water heaters last longer than storage ones. The principal reason is that storage geyser water heaters can decompose. However, with the easy availability of spare parts, you have geysers lasting for more than 10 years.

    Advantages of choosing the right size of geyser

    Choosing the right size should not be a problem for anyone after going through this article. The advantages of choosing the optimum size are many. Let us look at some of them in brief.

    • You save energy in the form of electricity consumed.
    • You save time because the water will be at optimum temperature at all times.
    • As you run your geyser for the right amount of time, you increase the longevity of the appliance.
    What is the Ideal Water heater Size For a Family of 4?

    For a family of 4 members, 25 Litre Storage Geyser is the right size for Bucket bathing and shower. If you want Instant Geyser, you can go with the 6-liter model but it is not suitable for a shower bath.

    What is the Ideal Water heater Size For 5 Person Family?

    Instant Water heaters are not suitable for 5 Person families, 25 Liter water heater is required for a Bucket bath. 1 x 25 liters, 1 x 15 Liters Geysers Required for shower bathing.

    Water Heater Size for 3 Bedroom House and 4 Bedroom House

    For an Apartment with 3 or 4 Bedrooms and attached bathrooms, you can install 15 Liter or 25 Liter storage water heaters in each bathroom. The size of the Geyser depends on the size of the family.

    You can use the above water heater size calculator to easily find the right size.

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    Srinivasa Chaithanya
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    Srinivasa Chaithanya is a Computer engineer, creator, and editor in chief of vsctimes. He is a Microsoft Certified Solutions Expert and has experience of Ten years in technology news reporting and his area of expertise includes Large Appliances and Electronics.

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