Estimates, Running Costs and Checklists
Heat-pump water heater cost in India: savings, payback and when it makes sense
How a heat-pump water heater compares with an electric geyser and solar heater on price and running cost in India, with COP-based payback examples for homes and guest houses.
A heat-pump water heater makes financial sense in India when you heat a lot of water every day for most of the year, for example a large family, a hostel, a PG, a guest house or a small hotel, and your electricity tariff is high. It uses a compressor to move heat from the air into the water, so with a coefficient of performance (COP) of about 3 it needs roughly one-third of the units an electric geyser would use for the same hot water. The catch is price: it typically costs several times more than a storage geyser, plus installation and space. For one family using hot water only in winter, the extra cost may not be recovered within the unit's life.
Part of the AC and geyser total cost worked examples.
How the saving is calculated
- Daily hot water need in litres and the temperature rise.
- Heat energy = litres × rise × 1.163 Wh.
- Units with a resistive geyser ≈ heat energy (plus standing loss).
- Units with a heat pump ≈ heat energy ÷ COP (plus its own standing loss and any electric backup use).
- Saving = (units saved per year) × tariff.
- Payback = price gap ÷ yearly saving.
COP figures are quoted at rated test conditions, usually with warm air. In cold north Indian winter mornings the COP falls, and some units switch on an electric backup element. Use a conservative average COP.
Case 1: guest house, year-round (illustrative)
| Input | Value |
|---|---|
| Daily hot water from heater | 300 litres |
| Rise | 25°C average over the year |
| Days per year | 330 |
| Heat needed per year | 300 × 25 × 1.163 × 330 ÷ 1,000 = 2,878 units |
| Tariff (commercial, illustrative) | ₹9.00 |
| Average COP assumed | 3.0 |
| Electric geysers | Heat pump | |
|---|---|---|
| Units per year | 2,878 | 959 |
| Cost per year | ₹25,902 | ₹8,631 |
| Saving | ₹17,271 | |
| Price including installation (illustrative) | ₹45,000 (several geysers) | ₹1,40,000 |
| Price gap | ₹95,000 |
Simple payback: 95,000 ÷ 17,271 = about 5.5 years. Over 12 years, net saving before tariff rises is about ₹1.12 lakh. Enter these in the payback calculator.
Case 2: family of five, winter-heavy use (illustrative)
| Input | Value |
|---|---|
| Daily hot water | 100 litres |
| Rise | 30°C |
| Days per year | 150 |
| Heat needed | 100 × 30 × 1.163 × 150 ÷ 1,000 = 523 units |
| Tariff | ₹7.00 |
| Average COP (cold months) | 2.5 |
- Geyser: 523 units → ₹3,661 a year
- Heat pump: 209 units → ₹1,463 a year
- Saving: ₹2,198 a year
- Price gap (illustrative): heat pump ₹75,000 vs geyser ₹12,000 = ₹63,000
- Simple payback: about 29 years: not worth it on cost alone.
Case 3: same family, year-round use in a hilly region (illustrative)
300 days of use, 35°C rise, COP 2.5, tariff ₹7:
- Heat needed: 100 × 35 × 1.163 × 300 ÷ 1,000 = 1,221 units
- Geyser cost: ₹8,547; heat pump: 488 units → ₹3,416
- Saving: ₹5,131 a year
- Payback on ₹63,000 gap: about 12 years
Payback is still long. A solar water heater with electric backup may suit this house better if roof space and sun are available.
Heat pump vs solar vs geyser
| Point | Electric geyser | Solar water heater | Heat-pump water heater |
|---|---|---|---|
| Upfront cost | Low | Medium to high | High |
| Running cost | Highest | Very low in sun; backup in cloud | Low |
| Works at night / cloudy days | Yes | Needs backup or stored water | Yes |
| Space | Bathroom wall | Roof with sun | Ventilated utility area or terrace |
| GST (check invoice) | Generally 18% | 5% from 22 Sept 2025 | Check HSN on invoice |
| Servicing | Simple | Descaling, tube care | Refrigerant circuit, fan, compressor |
See water heater types for more on each.
Practical points before buying
- Placement: The unit pulls heat from the surrounding air and blows out cool air. It needs ventilation; a closed small room will get cold and the COP will fall.
- Noise: It has a compressor and fan like an AC outdoor unit. Avoid placing it next to bedrooms.
- Service network: In smaller towns, check that an authorised technician can service the refrigerant circuit.
- Water quality: Hard water scales heat exchangers. Ask about descaling and filters.
- Warranty: Check separate periods for tank, compressor and electronics.
- Backup element: Ask when it switches on and what it draws; frequent backup use cuts savings.
- Labelling: Check whether the model carries any BEE label and what it states. Do not rely on a "star" claim without seeing the label.
Does a hot-and-cold AC count?
A reversible ("hot and cold") split AC is also a heat pump, but for space heating, not water. For a house that runs both a room heater and a geyser in winter, the AC route cuts room-heating units and the water heater choice is separate. See split, window and inverter ACs.
FAQ
What COP should I assume?
Use the manufacturer's rated COP as an upper bound and reduce it for cold-season use. For rough planning, 2.5–3 is a cautious range unless the specification says otherwise.
Is there a subsidy for heat-pump water heaters?
Programmes vary by state and time and are more common for solar. Check your state energy development agency and DISCOM; enter any confirmed benefit in the subsidy field of the calculator.
Can a heat pump work with solar panels?
Yes; it is an electrical load like any other. Rooftop solar reduces the units you buy from the grid.
Sources
- Bureau of Energy Efficiency — appliance labelling programme
- Ministry of New and Renewable Energy — solar water heating
- GST Council — rates on solar water heaters and appliances
- Your State Electricity Regulatory Commission — domestic and commercial tariffs
