Heat pump calculator

Answer four questions to estimate what a heat pump would cost to run.

What heats your home now?

What type of home?

Roughly how large?

Do you know your annual use?

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Heat pump efficiency (units of heat per unit of electricity)Typical about 2.8Current boiler or heater efficiency (%)Typical 85%Electricity rate (p/kWh)Gas price (p per kWh)Heat your home needs a year (kWh)From an EPC or heat-loss surveyShare used for hot water (%)Typical 20%

How this was calculated

We estimate how much heat your home needs in a year: from your own fuel use if you gave it, otherwise from typical use for the type and size of home, anchored on Ofgem's typical household gas use.

Your current system turns fuel into heat at about 85% efficiency. A heat pump typically delivers about 2.8 units of heat for each unit of electricity across a year, in line with UK field trials, and a little less for hot water.

Prices: current Ofgem price cap, GB average, Direct Debit, for electricity and gas. Standing charges are left out unless you choose to remove gas. Installation costs are not included.

Method version 1.0, checked 2026-10-02. Ofgem typical use · Electrification of Heat trial

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