Key Takeaways
- Start with two questions, how many people and bucket or shower, and most of the buying decision falls into place.
- Storage suits families and morning rushes; instant suits single users, kitchens and quick bucket baths.
- In hard-water areas the tank lining and a replaceable anode rod matter more than any headline feature.
- Always insist on the ISI mark, a clear warranty split, and a brand serviced locally with genuine spares.
- Budget for installation and safety fittings up front so there’s no surprise bill on the day.
Buying a water heater throws up the same handful of doubts in almost every home I visit: which type, what size, does the star rating really matter, and will this thing survive our hard water. People ask me these on the doorstep before the old geyser is even switched off. Over more than ten years of fitting and servicing water heaters across Indian homes, I’ve answered them so often that I’ve collected the clearest replies here. By the end you’ll have straight, practical answers to the questions buyers ask me most, with no sales spin. If you’re starting from scratch, our complete water heater buying guide walks through the whole decision in order.
Choosing the Right Type and Size
Which type of water heater should I buy?
It depends on how you use hot water. A storage geyser holds a tankful ready, which suits families and a busy morning. An instant geyser heats water only as it flows, which suits a single person, a kitchen tap, or a quick bucket. Gas and solar have their own strengths on running cost.
If you’re unsure where to begin, our primer on the types of water heaters explained for India lays out storage, instant, gas and solar side by side so you can match a type to your home before you shop.
What size geyser do I need?
Size by usage, not by guess. As a rough starting point I use in homes: 6-10 L for one person’s bucket bath, 15 L for a couple, and 25 L for a family of four wanting showers. The right size is the one that covers your busiest morning without keeping a mountain of unused water hot all day.
Tip: When you’re stuck between two sizes, size for your busiest morning, not your quietest one, then stop. That covers the real rush without paying to keep extra litres warm the rest of the day.
Cost, Efficiency and Star Ratings
Do BEE star ratings actually save money?
Yes, over the years you own the geyser. A higher BEE star rating means less heat leaks away while the tank sits, so a storage geyser costs less to keep hot. The saving is on standby loss, not on how hot the water gets. For a geyser you’ll run daily for years, a good rating usually pays back the small price difference.
Is a costlier geyser worth it?
Sometimes, but not for the badge alone. The cheapest units often skimp on insulation, tank quality and warranty, so they cost more over their life. Equally, a premium price is wasted if nobody services the brand near you. Judge the total cost of owning it, running bills and likely repairs, alongside how well it’s supported locally.
A lot of confident but costly advice circulates in showrooms, so it helps to separate fact from sales talk in our roundup of geyser buying myths that waste your money before you pay.
Hard Water, Safety and Tank Quality
Which geyser is best for hard water?
In hard-water areas, and much of India has them, look past the brochure features to the tank. Choose a glass-lined or anti-corrosion tank with a sacrificial anode rod you can replace, and accept that you’ll descale it periodically. This single choice often decides whether the geyser lasts three years or ten.
Warning: Never buy a water heater without the ISI mark to save a little money. It is a high-load appliance in a wet bathroom, and the ISI mark under BIS is your basic assurance it meets Indian safety norms. Safety certification is not a place to economise.
What safety fittings does a geyser need?
Every geyser needs a working pressure relief valve, a dedicated and properly earthed electrical point, and ELCB or RCCB protection on that circuit. I hand the wiring and earthing to a licensed electrician on every job, and I’d urge you to do the same. In a wet room, that’s what protects the family, not any feature on the box.
Warranty, Installation and Buying Smart
What should I check in the warranty?
Read which part is covered and for how long. Many brands give a long tank warranty but a much shorter one on the element and other parts, and some exclude hard-water damage. The headline number on the box rarely tells the whole story, so check the split before you decide.
Is installation included in the price?
Not always, and this catches people out. Ask exactly what’s in the box, whether fitting is free or paid, and whether authorised installation is needed to keep the warranty valid. Budget for the bracket, safety valve, pipes and an electrician’s time so there’s no surprise bill on delivery day.
What’s a quick way to compare two geysers?
Line them up on the things that actually matter to your home and ignore the rest of the noise.
- Right capacity for your household’s usage.
- Tank lining and a replaceable anode for your water quality.
- ISI mark and a clear, fair warranty split.
- BEE star rating for long-term running cost.
- Local service reach and genuine spares.
Whichever unit wins on more of these is usually the better buy, whatever the shop is pushing that week.
Does my water pressure affect which geyser I buy?
It can. Homes fed only by an overhead tank often run at low pressure, while flats on a pressure pump run higher. Some instant geysers and certain mixer setups want a minimum pressure to work well, so a unit that’s perfect in a pumped flat may dribble in a gravity-fed home.
Before buying, note whether your supply is gravity-fed or pumped and mention it to the dealer. It’s a quick check that saves the disappointment of a new geyser that technically works but never gives a satisfying flow.
How long should a good geyser last?
With decent water and basic care, a well-chosen storage geyser commonly gives many years of service before the tank or element needs serious attention. In hard-water homes that span shortens sharply if the anode and scale are ignored, which is exactly why the tank quality and maintenance you plan for at purchase matter so much.
Quick Buyer’s Reference
| Your situation | Sensible starting point |
|---|---|
| Single person, bucket bath | 6-10 L instant or small storage |
| Couple, mixed use | 10-15 L storage |
| Family of four, showers | 25 L storage |
| Hard-water area | Glass-lined tank, good anode |
| Cutting long-term bills | Higher BEE star rating |
Treat this as a starting point and adjust for your own habits, water pressure and wall space. Get these basics right and the finer choices between brands become much easier.
Frequently Asked Questions
Which type of water heater should I buy?
It depends on usage. A storage geyser holds a tankful ready and suits families and busy mornings, while an instant geyser heats water as it flows and suits a single person, a kitchen tap or a quick bucket. Gas and solar have their own running-cost strengths worth comparing.
What size geyser do I need for my family?
Size by real usage. As a rough guide, 6 to 10 litres suits one person’s bucket bath, 15 litres a couple, and 25 litres a family of four wanting showers. Choose the size that covers your busiest morning without keeping a lot of unused water hot all day.
Do BEE star ratings really save money?
Yes, over the years you own it. A higher BEE star rating means less heat leaks away while the tank sits, so it costs less to keep hot. The saving is on standby loss, not water temperature. For a geyser run daily for years, a good rating usually pays back its small premium.
Which geyser is best for hard water?
In hard-water areas, choose a glass-lined or anti-corrosion tank with a replaceable sacrificial anode rod, and plan on periodic descaling. This choice matters more than any headline feature and often decides whether the geyser lasts a few years or well over a decade.
Is geyser installation included in the price?
Not always. Ask exactly what’s in the box, whether fitting is free or paid, and whether authorised installation is needed to keep the warranty valid. Budget for the bracket, safety valve, pipes and an electrician’s time so there is no surprise bill on delivery day.
Should a water heater always have the ISI mark?
Yes, without exception. The ISI mark under BIS confirms the geyser meets Indian safety standards, which is essential for a high-load appliance in a wet bathroom. Never buy an unbranded or non-ISI unit to save money; basic safety certification is not a place to cut corners.
Final Word
Most buying doubts melt away once you answer two things honestly: how many people use the hot water, and do they bucket or shower. From there, match the type, mind your water quality, insist on the ISI mark and a fair warranty, and pick a brand someone local can service. That’s the whole decision, without the sales spin.
To take it step by step, work through our water heater buying guide, or browse all our buying guides for the deeper dives. For an independent explanation of what energy labels mean, the Bureau of Energy Efficiency is a trustworthy reference.
