Geyser Buying Guide for Winter: Size, Type, Star Rating and the Safety Checks Nobody Mentions

The first cold morning of the season is usually when people discover the old geyser has given up. Then it’s a rushed trip to the shop or a quick online order, and the pick ends up being whatever is in stock.

If you still have a few days, here’s how to choose properly. It’s mostly about three things: the right type, the right size and a safe installation.

Instant vs storage: which type do you need?

	Instant geyser	Storage geyser
Typical capacity	1–6 litres	10–35 litres
Best for	Kitchen sink, hand washing, small bathroom with a bucket	Showers, bucket baths, families
Heating	Fast, but only a small amount at a time	Takes 15–30 min to heat, then stays hot
Power draw	Often 3 kW or more	Usually around 2 kW
Wiring	Needs a socket and wiring rated for the load	Standard geyser point is usually fine

For most bathrooms in north Indian homes, a storage geyser is the practical choice. Instant geysers make sense for the kitchen, or where only one person needs a quick wash.

What size storage geyser?

• 10–15 litres: 1–2 people, mostly bucket baths.
• 15–25 litres: 2–4 people, or anyone who uses a shower.
• 25–35 litres: larger families, back-to-back baths in the morning, or a bathtub (rare, but it happens).

Remember that you mix hot water with cold. A 15 L tank at a high setting gives you noticeably more than 15 litres of comfortable bathing water. Buying bigger than you need just means heating water you never use.

Star rating on geysers

Storage water heaters carry a BEE star label. For geysers, the rating mainly reflects how well the tank holds heat once the water is hot (its “standing loss”). A better-insulated 5-star tank loses heat more slowly, so the heating element switches back on less often.

That matters most if you keep the geyser on for long stretches. If you switch it on 20 minutes before a bath and off right after, the difference between ratings shrinks. Our BEE star rating explainer shows how to work out whether the extra stars pay back.

What does a geyser cost to run?

Simple maths: a 2,000 W (2 kW) geyser running for 30 minutes uses about 1 unit of electricity. At ₹8 a unit, that’s ₹8 a day, or roughly ₹240 a month for one daily heating cycle. Two family members bathing at different times? Double it.

For your own numbers, use our appliance energy cost calculator.

Features that are actually worth paying for

• Adjustable thermostat: lets you set a lower temperature, which saves power and reduces scald risk.
• Multi-function safety valve: releases pressure if something goes wrong. Non-negotiable.
• Glass-lined or good enamel tank + magnesium anode: important if your area has hard water. The anode slowly corrodes instead of the tank.
• Tank warranty of several years: the element warranty is usually short; the tank warranty tells you more about build quality.

Wi-Fi control, colour-changing LEDs and “smart” apps are nice to have, but they don’t make the water hotter. Don’t let them push you up a price bracket.

Installation and safety checks

This is the part that doesn’t show up in product listings, and it matters most.

• Proper earthing. Ask the installer to confirm the geyser point is earthed. A geyser without earthing is a shock risk in a wet bathroom.
• RCCB protection. If your home’s distribution board has an RCCB, test it. Our electrical safety guide shows how.
• ISI mark on the geyser. Check the licence number using the BIS Care app if you’re buying from an unfamiliar brand.
• Mount it on a solid wall with the brackets supplied. A full 25 L tank is heavy.
• Switch it off before you bathe if your wiring is old or you’re not sure of the earthing. Many families do this as a habit, and it’s a good one.

A serious note on gas geysers

Gas (LPG) geysers are cheaper to run and still common in some cities. But they burn gas, and in a small bathroom with the door and window shut, they can produce dangerous levels of carbon monoxide, a gas you can’t see or smell. Every winter there are news reports of people collapsing in bathrooms for exactly this reason.

If you use a gas geyser, it must be installed outside the bathroom or in a well-ventilated spot with a flue, and the bathroom should have an open ventilator or exhaust. Headache, dizziness and nausea in the bathroom are warning signs. MedlinePlus (from the US National Library of Medicine) has a clear page on carbon monoxide poisoning symptoms. If someone feels unwell, get them into fresh air immediately and call 112.

Maintenance: once a year

• In hard-water areas, get the tank descaled and the anode rod checked every 1–2 years.
• Look for rust at the bottom of the tank or around the pipe joints.
• If the geyser trips the MCB or makes crackling noises, stop using it and call a technician.

A good time to do this check is during your yearly deep clean. It’s on our room-by-room cleaning checklist under bathrooms.

Buying in a sale?

Geysers go on discount right around now. Check that the model number matches what’s in reviews, look at what the warranty covers, and confirm whether installation and the inlet/outlet pipes are included, since those often cost extra. Our seven festive-sale checks apply here too, and the discount calculator will give you the real price after bank offers.