Costs, Star Ratings and 2026 Rules
Geyser types in India: storage, instant, gas, solar and heat-pump water heaters compared
How storage and instant electric geysers, LPG/PNG gas geysers, solar water heaters and heat-pump water heaters differ in price, running cost, safety and fit for Indian homes.
For a bathroom where two or more people bathe one after another, an electric storage geyser (often 15 to 25 litres) is the usual choice in Indian homes. A small instant heater (1 to 6 litres) suits kitchens and quick hand-washing. A gas geyser is cheap to run where LPG or piped gas is available, but must be installed with ventilation outside a closed bathroom because of carbon monoxide risk. A solar water heater costs more upfront but very little to run in sunny regions, and its GST fell to 5% from 22 September 2025. A heat-pump water heater costs the most among electric options but uses a fraction of the electricity, which suits families with high daily hot-water use.
Part of the AC and geyser price factors overview.
The five types at a glance
| Type | How it heats | Typical sizes | Running cost pattern | Main risk |
|---|---|---|---|---|
| Electric storage | Element heats a tank; thermostat keeps it hot | 10–35 L for homes | Units for heating + standing loss while switched on | Scalding, shock if earthing fails, pressure build-up without a working valve |
| Electric instant | High-wattage element heats a small tank or flow quickly | 1–6 L | High power for short periods; no long standing loss | High current; wiring must suit the load |
| Gas (LPG/PNG) | Burner heats water as it flows | By flow rate (litres per minute) | Gas cost; little electricity | Carbon monoxide in closed spaces; gas leaks |
| Solar | Collectors on roof heat water into an insulated tank | 100–300 L for homes | Near zero in sun; electric backup in cloudy weather | Scaling with hard water; roof space and load |
| Heat pump | Refrigerant cycle moves heat from air into water | Often 150 L+ for homes | A fraction of resistive heating units | Needs airflow and space; higher repair complexity |
Electric storage geysers
These are the familiar wall-mounted geysers. Price depends on tank capacity, tank material and lining (glass-lined, stainless steel and other coatings), element type, insulation thickness and the safety devices included.
BEE label: Stationary storage type electric water heaters are covered by a BEE labelling regulation issued in 2016. The star band reflects standing heat loss over 24 hours. Better insulation means fewer units wasted keeping water hot. A higher-star geyser saves most when it stays switched on for long periods.
Safety parts to check: a thermostat, a thermal cut-out (that shuts off power if the thermostat fails), a pressure relief valve or multi-function safety valve, and proper earthing. See geyser safety failures.
Instant electric heaters
Instant heaters are compact and cheap but draw a lot of power while running, often 3 kW or more. They suit a kitchen sink or a single wash basin. Some higher-power models are designed for showers, but water flow and temperature rise are limited, especially in winter in the north. Make sure the circuit and MCB are rated for the load.
Gas geysers
LPG or PNG gas geysers heat water continuously as it flows, so there is no tank to run dry. They are economical where gas is cheaper per unit of heat than electricity.
Solar water heaters
A solar water heater uses roof-mounted collectors (flat plate or evacuated tube) with an insulated tank, often with an electric backup element. Upfront cost is higher, but running cost is close to zero in sunny months.
- GST: solar water heaters and systems moved from 12% to 5% from 22 September 2025.
- Roof and society: you need shade-free roof space; in an apartment, the society's permission.
- Hard water: evacuated tubes and pipes can scale; ask about water softening or the right collector type.
- Subsidies: central and state support for solar water heaters has varied over the years. Check your state's renewable energy development agency and the Ministry of New and Renewable Energy before counting on any.
Heat-pump water heaters
A heat-pump water heater uses the same principle as an AC in reverse: a compressor and refrigerant extract heat from the surrounding air and put it into the water. Manufacturers usually quote a coefficient of performance (COP), the heat delivered per unit of electricity. A COP of 3 means about one-third of the units a resistive element would use for the same hot water, at the rated test conditions. COP falls in cold air.
They suit homes, hostels and guest houses with high daily hot-water use. They need a ventilated location such as a utility area or terrace and cost much more to buy. The heat pump payback guide shows when the price gap is recovered.
Choosing by situation
| Situation | Types to consider |
|---|---|
| Small family, one bathroom, mild winters | Storage geyser 10–15 L, or instant for short use |
| Large family, back-to-back baths | Storage 25 L or more, solar with backup, or heat pump |
| Kitchen only | Instant 1–3 L |
| Piped gas available, ventilated utility area | Gas geyser |
| Independent house with sunny terrace | Solar with electric backup |
| High daily use, high electricity tariff | Heat pump |
Electricity cost of a storage geyser (illustrative)
Heating 25 litres from 15°C to 45°C takes about 25 × 30 × 1.163 Wh ≈ 0.87 kWh (units), plus losses. Twice a day for 120 winter days is about 210 units. At ₹7 per unit that is about ₹1,470 a season, before standing losses if the geyser is left on. See geyser running cost for the full method and the GST guide for tax by type.
FAQ
Is a bigger geyser more expensive to run?
A bigger tank loses more heat standing, but if you use the hot water, the energy needed depends on litres used, not tank size. Avoid oversizing.
Do instant geysers save electricity?
They avoid standing losses, so for small, occasional use they can. For long showers they use the same energy to heat the same water.
Can I keep a geyser on all day?
It will keep reheating to cover heat loss. Switch it off when not needed, or use a timer.
Sources
- Bureau of Energy Efficiency — storage type electric water heater labelling regulations (2016)
- Ministry of New and Renewable Energy — solar thermal programmes
- GST Council — 5% rate on solar water heaters from 22 September 2025
- Bureau of Indian Standards — water heater standards
