Heat pump electricity and cost calculator

Start with useful heat demand, not electricity or gas consumption taken unchanged from a bill. Enter a seasonal performance estimate appropriate to the installation. You can include a gas alternative when its energy price, efficiency and relevant fixed charges are known.

Formula

Heat pump electricity = annual useful heat demand ÷ SCOP. Running cost = electricity × unit price. Direct electric heating is modelled at one unit of heat per unit of electricity. Gas cost = heat demand ÷ boiler efficiency × gas unit price + entered fixed charges.

Worked example

A home needing 12,000 kWh of useful heat with a SCOP of 3 requires an estimated 4,000 kWh of heat pump electricity annually. A SCOP of 4 reduces that estimate to 3,000 kWh.

What the result means

Positive savings mean lower modelled energy costs against the selected alternative. For a replacement decision, enter the additional investment to be recovered rather than an unrelated project total.

Electricity price · India

₹8.00/kWh is an illustrative input, not an India-wide average or an official electricity tariff. Replace it with the applicable rate for your state, DISCOM, consumer category and consumption slab.

Last reviewed: 9 September 2026

Electricity duty, fuel or power purchase adjustments, fixed charges and subsidies depend on the applicable state and DISCOM rules. No national tax percentage or subsidy is assumed. Slab thresholds, sanctioned-load charges and time-of-day tariffs are not automatically modelled.

Assumptions and limits

Weather, insulation, flow temperature, hot water, defrosting and backup heating influence real performance. Maintenance, grants, finance and future tariff changes are excluded.

Questions answered

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