Annam Naturals
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Heat pump water heaters vs geysers: the running-cost maths

A heat pump water heater costs more to buy but uses far less electricity. Here is how to work out whether it pays back in your home.

2 October 2026 · 8 min read

Water flowing from a shower head

Chetanya Goel · Founder & Editor

Chetanya started Annam Naturals after two years of keeping a household waste diary. Chetanya writes about the boring, repeatable habits that hold up in a real week.

In many Indian homes, the geyser is the single biggest electricity user in winter. A conventional electric geyser heats water with a resistance element, turning one unit of electricity into one unit of heat. A heat pump water heater pulls heat from the surrounding air and moves it into the water, typically delivering around three units of heat for each unit of electricity.

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How to estimate your savings

You can work out a rough figure for your household:

  • Estimate how many units (kWh) your geyser uses in a winter month; a meter reading before and after a week of normal use works well
  • Multiply by your electricity price per unit
  • A heat pump might use roughly a third of that
  • The difference, over the months you need hot water, is your annual saving

Then compare the extra purchase cost of the heat pump with that saving to estimate the payback period.

When a heat pump makes sense

  • Families with high hot water use, such as several people bathing daily
  • Homes with long winters or year-round hot water needs
  • Places with high electricity tariffs
  • Larger homes, schools, hostels and hotels, where savings scale quickly

When a geyser may still be the better choice

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  • Small households with light use
  • Homes in warm regions where hot water is needed only a few weeks a year
  • Where space or installation is difficult

Practical considerations

Heat pumps are bigger than geysers and need space with airflow, often on a balcony or utility area. They make a fan noise. They also cool the air around them slightly, which can be a bonus in a hot utility room.

Getting more from any water heater

  • Set the thermostat to a moderate temperature rather than the maximum
  • Switch it on a short time before use rather than leaving it on all day, or use a timer
  • Insulate hot water pipes
  • Fix dripping hot taps
  • Choose a geyser with a good energy rating if you are replacing one

Consider solar too

In sunny regions, a solar water heater can provide much of a household's hot water for free once installed. Our next article looks at how solar water heaters perform in a North Indian winter.

For more of this kind of testing, the eco-friendly product guides hub collects everything we've tried in that area.

Frequently asked

Do I need to buy anything to get started?

No. Every method here begins with what is already in your cupboards. We only recommend a purchase when something has genuinely worn out, and we say what it should cost.

How do you test the things you write about?

Minimum four weeks of ordinary household use, with notes. For anything involving energy or money we use a plug-in meter and record the readings before and after.

Are your recommendations paid for?

Never. Brands cannot buy placement. Some outbound links are affiliate links, which we mark, and they do not change what makes the list.

What if a method doesn't work in my home?

Write to us. A surprising amount of our best material comes from readers explaining why something failed in a flat, a shared house or a very cold winter.

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