Air source heat pump running costs UK

What is an air source heat pump? explains the system basics before cost comparisons.

Air source heat pump survey covers the checks needed before pricing or design.

Cost of electricity in UK and heat loss calculations explain the bill drivers behind the headline running-cost number.

For 1 April to 30 June 2026, Ofgem's average default-tariff electricity benchmark is 24.67p per kWh with a 57.21p daily standing charge.

The heat loss figure is usually the biggest practical input. A weak room-by-room calculation can make the running-cost estimate look cleaner than the home will feel.

Emitter sizing, flow temperature, controls and hot-water strategy decide whether the system can run efficiently or has to work harder than the quote assumed.

Energy Saving Trust says air source heat pumps usually cost a little more to run than new gas and oil boilers at current prices. It also says homes replacing other heating systems should see savings.

GOV.UK describes heat pumps as highly efficient electric appliances that can deliver about three units of heat for each unit of electricity used. That is why the answer is never just “electricity costs more than gas”.

Both points can be true at once: the technology is efficient, but the tariff gap still matters. The real running bill depends on the home, the system design, and how the system is controlled.

The biggest input is still how much heat the property actually needs. Weak heat-loss assumptions, poor insulation context, or optimistic U-values can make a system look cheaper to run on paper than it will be in real life.

Emitter sizing, flow temperature, and controls matter fast. A well-set system with the right emitters usually costs less to run than a rushed design that has to lean on higher temperatures to keep rooms warm.

Electricity tariff choice, hot-water strategy, and household usage pattern can all change the bill. That is why “what does a heat pump cost to run?” is the wrong question unless the tariff and usage pattern are on the table too.

For 1 April to 30 June 2026, Ofgem gives an average electricity rate of 24.67p per kWh for default-tariff Direct Debit households in England, Scotland and Wales. The daily standing charge is 57.21p.

The Boiler Upgrade Scheme can still cut the upfront install cost by £7,500 for eligible air source heat pump jobs in England and Wales. That improves the buying decision, but it does not change the day-to-day running bill.

Use the Ofgem rate as a current benchmark, then sense-check it against heat loss, emitter size, controls, and the tariff the household is likely to use. That gives you a serious answer instead of a sales line.

Are air source heat pumps cheaper than gas to run?

Not automatically. Energy Saving Trust says that, at current prices, they usually cost a little more to run than new gas and oil boilers. Heat loss, controls and flow temperature can change the answer quickly.

What electricity rate should I use?

Use Ofgem's 1 April to 30 June 2026 benchmark as the current national reference: 24.67p per kWh and a 57.21p daily standing charge. Then compare it with the household's actual tariff and region.

What moves the bill the most?

The real driver is usually heat demand. Weak heat-loss assumptions, undersized emitters, or a system that has to run hotter than planned can all make the bill drift away from the sales estimate.