How to Choose the Right Water Heater for Your Bathroom

The right water heater for a bathroom depends on five things: how many people use it, how they bathe, how much wall space you have, your building's water pressure and your water quality. For most family bathrooms, a 15L storage geyser is a safe starting point. A small bathroom with quick washes can use an instant geyser, and a hard-water home should look for a glassline tank.

This guide helps you choose a bathroom water heater by looking at your bathroom first, not the product list. Check the five points below, match them to the table, and you will know which geyser for your bathroom to shortlist.

Which type suits a bathroom: storage or instant?

A storage geyser heats a full tank and keeps it hot, so it gives plenty of hot water for showers, baths and buckets, one after another. An instant geyser has a small tank and heats water as it flows, so it suits short use in a small space.

If two or more people bathe back to back, or you fill buckets, choose storage. Our storage water heaters cover this need. For a guest bathroom or a one-person flat where baths are short, our instant water heaters are enough. For a deeper comparison, read instant vs storage geysers.

1. How many people use the bathroom, and how do they bathe?

Capacity is the first thing to settle. Use this as a guide, and size up if you use a shower for long, take back-to-back baths in the morning, or live in a cold region.

If you are between two sizes, take the larger one. A tank slightly larger than you need is better than one that runs out halfway through a bath. Our geyser capacity guide shows how to work this out for your home.

2. How much wall space does your bathroom have?

Measure before you shop. A vertical storage geyser needs wall height, a clear spot away from the shower spray, and room for the pipes. Many city flats have low ceilings or a short wall above the door.

•       Low wall or false ceiling: A horizontal geyser lies flat and needs less height. Our Aquaslim Horizontal 15L (right inlet) is priced at ₹9,120.

•       Very small bathroom: Choose a 6L storage geyser such as the Maverick at ₹7,660, or an instant geyser.

•       Tall wall and a family: Go with a vertical 15L or 25L storage geyser.

Also check that the wall is strong enough. A full 15L or 25L tank is heavy, so it needs a solid brick or concrete wall and the right brackets, fitted by a technician.

3. What is your building's water pressure?

Tall buildings send water down or up at high pressure, and not every geyser is built for it. Check the pressure rating on the product page. Several of our storage geysers are rated up to 8 bar, which suits high-rise flats, while our instant geysers are rated for low and mid-rise buildings.

•       High-rise flat: Choose a model rated for high pressure, such as the Aquator IoT, a 5 star 15L geyser rated up to 8 bar, priced at ₹10,525.

•       Independent house or low-rise: Most storage and instant geysers will work. Check the rating all the same.

Read more in our guide to geysers for high-rise buildings.

4. How hard is your water?

Hard water leaves scale on the tank and heating element, which slows heating, raises your bill and shortens the life of the geyser. If your water leaves white marks on taps and glass, look for these features:

•       A glassline tank, which resists corrosion better than untreated steel.

•       A scale-resistant heating element. Our Aquator Neo has a Duron heating element with a non-stick coating that prevents corrosion and scaling, and a glassline tank. The 15L is priced at ₹10,840.

•       A magnesium anode rod, which corrodes in place of the tank.

Servicing once a year also helps. For a closer look at tank types, see glassline vs polymer-coated tanks.

5. What does your budget and electricity bill look like?

Price depends on the tank, the build and the features. Our Enamour Classic Pro is a 5 star polymer-coated geyser that starts at ₹5,899 for 10L and ₹6,399 for 15L. Glassline models cost more, since they last longer in hard water.

A higher BEE star rating means lower standby loss, which helps your bill over the years. See our guide to 3 star vs 5 star geysers for the difference in rupees.

Which water heater for which bathroom?

For a full list of options by size and budget, read our guide to the best geysers for the bathroom.

Plan the safe installation before you buy

A bathroom is a wet room, so electrical safety matters as much as size. Plan these before you order.

•       Earthing and an RCCB or ELCB. Ask an electrician to check the earthing and fit an RCCB or ELCB on the geyser circuit. It cuts the power if there is a leak.

•       A separate power point. Place the socket outside the splash zone and away from the shower. Avoid extension boards for a geyser.

•       Spot away from the spray. Mount the geyser high on a wall, away from the shower head and taps.

•       Pipes and fittings. Use the connecting pipes and fittings made for your geyser, fitted by a trained installer. Several of our models come with free installation.

•       Safe use. Switch the geyser off at the switch before you bathe, and do not set the thermostat to maximum. Read our step-by-step guide to using a geyser safely in the bathroom.

Mistakes to avoid when choosing a bathroom water heater

•       Buying by price alone and ending up with a tank that is too small.

•       Ignoring the pressure rating in a high-rise flat.

•       Skipping a glassline tank in a hard-water area.

•       Not measuring the wall before ordering.

•       Fitting the geyser in the splash zone or without an RCCB or ELCB.

•       Letting a general plumber guess the load. Ask an electrician to check your wiring.

FAQs

Q: Which is the best water heater for a bathroom?

A: There is no single best one, because it depends on your bathroom. A 15L 5 star storage geyser suits most family bathrooms. A small or guest bathroom can use an instant or 6L geyser, and a hard-water home should choose a glassline tank.

Q: Can I use an instant geyser for a full bathroom?

A: For one person with short baths, yes. For several people, long showers or buckets, a storage geyser is a better fit, because an instant geyser holds only a small amount of water.

Q: Is it safe to install a geyser inside the bathroom?

A: Yes, if it is earthed, fitted by a trained installer, placed away from the shower spray and protected by an RCCB or ELCB. Switch it off before you bathe.

Q: What size geyser do I need for a bathroom with two people?

A: 10L to 15L is usually enough for two people, and 15L is a safe choice if you take long showers or live somewhere cold.

Q: Where should I fix the geyser in the bathroom?

A: On a strong wall, high up, away from the shower head and taps, with the socket outside the splash zone. A horizontal geyser suits low walls.

Q: How often should I service my bathroom geyser?

A: Once a year is a good habit, and more often in hard water. Servicing removes scale, checks the anode rod and keeps the geyser safe.