Heat pump calculator
Heat-pump water-heater calculator for India
Compare a heat-pump water heater with a normal electric geyser using Indian electricity tariffs and household hot-water demand.
A heat pump wins when its COP is high enough to beat the old fuel after install cost and grants.
Before
Geyser running cost
After
Heat pump running cost
Your heat-pump payback
Change hot-water demand, tariff, COP, installed cost, and subsidy.
Decision signal
Worth checking quotesThe default case can work, but local prices and rebates decide the final answer.
Annual saving
₹11,667
Simple payback
5.6 years
10-year net
₹51,667
This does not pay back with these assumptions. Try a lower upfront cost, higher usage, or better tariff spread.
Before vs after annual cost
lower is better| Decision number | Default | Why it matters |
|---|---|---|
| Upfront / net cost | ₹65,000 | The amount the savings must recover. |
| 5-year net | -₹6,667 | Useful if you may move or replace equipment early. |
| 10-year net | ₹51,667 | The long-run money signal after upfront cost. |
Old cost = heat demand / old efficiency x electricity price. Heat-pump cost = heat demand / COP x electricity price.
Default values are source-backed planning benchmarks, not quotes. For the most accurate result, replace them with your own bill, tariff, vendor quote, grant, and usage numbers.
Before you buy
Use the calculator as a quote filter
1. Enter your real tariff
Use your bill or supplier app, not a sales estimate.
2. Add the actual quote
Net of grants, rebates, discounts, and installation extras.
3. Share the link
Keep everyone comparing the same assumptions.
Trust layer
- -No signup wall before the answer.
- -Sources are visible at the bottom of every calculator.
- -The result warns users when the math does not pay back.
Quick answers
Common questions
Is this heat pumps calculator exact?
It is a planning estimate, not a quote. Replace the defaults with your actual quote, tariff, usage, and incentive numbers before buying.
Why does payback change so much when I move the sliders?
Big energy purchases are sensitive to usage, local energy prices, upfront cost, and incentives. A small change in those assumptions can move payback by years.
Should I use this before talking to vendors?
Yes. The calculator gives you a neutral baseline so you can compare vendor claims against source-backed math.
Sources for this page
- ENERGY STAR heat pump water heaters, Heat-pump water heater savings and payback benchmark.
- ENERGY STAR heat pump criteria, COP definition for heat-pump efficiency calculations.
- BEE Standards & Labelling, India appliance star-labelling programme and cost-saving objective.