Running a heat pump costs between £500 and £1,100 per year in electricity for a typical UK home in 2026
If you are thinking about switching from a gas boiler, the single biggest question is what it will cost to run. The annual electricity cost depends on three things: the heat pump’s efficiency (its SCOP), the size and insulation level of your home, and the current electricity unit rate.
The direct answer is that a typical 3-bedroom semi-detached home with average insulation will spend between £900 and £1,350 per year on electricity for an air-source heat pump in 2026.
For a typical 3-bedroom semi-detached home with average insulation, an air-source heat pump with a SCOP of 3.0 uses roughly 4,000–5,000 kWh of electricity per year for heating and hot water. At the 2026 average electricity price of 27p per kWh (source: Ofgem price cap, Q1 2026), this translates to an annual cost of £1,080–£1,350. A ground-source heat pump with a SCOP of 4.0 uses about 3,000–3,800 kWh per year, costing £810–£1,026 annually. Well-insulated homes with a SCOP of 3.5 can reduce electricity use to 3,500 kWh, costing around £945 per year.
Quick numbers annual electricity cost for heat pumps in 2026
| Home type | Heat pump type | Annual heat demand (kWh) | SCOP | Electricity used (kWh) | Cost at 27p/kWh |
|---|---|---|---|---|---|
| Small flat | Air-source | 4,500 | 3.0 | 1,500 | £405 |
| 2-bed house | Air-source | 7,500 | 3.0 | 2,500 | £675 |
| 3-bed semi | Air-source | 12,000 | 3.0 | 4,000 | £1,080 |
| 4-bed detached | Ground-source | 16,000 | 4.0 | 4,000 | £1,080 |
Heat demand figures are based on Energy Saving Trust average heating demand tables for UK homes, 2026 update. SCOP ranges are drawn from MCS installer data, 2026.
The direct answer heat pump electricity cost per year in the UK is £500–£1,100 for most homes in 2026
For a typical 3-bedroom semi-detached home with average insulation, an air-source heat pump costs £900–£1,100 per year in electricity. For a well-insulated 2-bedroom house, costs drop to £500–£700 annually. Ground-source heat pumps cost 20–30% less to run than air-source models, typically £600–£900 per year for a 3-bed home.
These figures assume a SCOP of 3.0 for air-source and 4.0 for ground-source, and the 2026 average electricity rate of 27p/kWh (source: Ofgem price cap). If you have a smart tariff or time-of-use rate, costs can be 10–15% lower by running the pump during off-peak hours (source: Octopus Energy Agile tariff data, 2026).
how to choose the right heat pump size for your home
How heat pump efficiency (SCOP) directly cuts your electricity bill
The Seasonal Coefficient of Performance (SCOP) measures how many kWh of heat the pump delivers per kWh of electricity used. An air-source heat pump with SCOP 3.0 uses 1 kWh of electricity to produce 3 kWh of heat; a SCOP of 4.0 uses 1 kWh for 4 kWh of heat.
Improving SCOP from 3.0 to 3.5 reduces electricity use by about 14% for the same heat output, saving roughly £130–£150 per year on a typical bill. SCOP is affected by outdoor temperature, system design, and the quality of installation; poorly designed systems can have SCOP below 2.5, doubling costs (source: MCS technical standards, 2026). To maximize SCOP, ensure your heat pump is sized correctly and your home has at least 200mm of loft insulation and cavity wall insulation (source: Energy Saving Trust).
Eligibility and installer verification MCS certification is essential for grants and performance
To qualify for the Boiler Upgrade Scheme (BUS) grant of £7,500 in 2026, the heat pump must be installed by an MCS-certified installer (source: GOV.UK Boiler Upgrade Scheme page, 2026). MCS certification ensures the installer follows design and performance standards, which directly impacts the SCOP and running costs.
Always check an installer’s MCS number on the MCS register before hiring. TrustMark registration is also required for BUS grants, providing consumer protection (source: TrustMark website, 2026). For ground-source heat pumps, ensure the installer holds NAPIT or NICEIC certification for heat pump installations.
How your home’s insulation level changes the annual cost by £200–£400
A poorly insulated home (solid walls, single glazing, no loft insulation) may need 50% more heat, increasing annual electricity use to 6,000–7,000 kWh and costs to £1,620–£1,890. A well-insulated home (cavity wall insulation, double glazing, 300mm loft insulation) reduces heat demand to 3,000–4,000 kWh, costing £810–£1,080.
Installing cavity wall insulation and upgrading to double glazing can cut heat loss by 30–40%, saving £200–£400 per year on heat pump running costs (source: Energy Saving Trust, 2026 insulation savings data). The Energy Performance Certificate (EPC) rating of your home gives a good baseline: homes rated C or above are best suited for heat pumps (source: GOV.UK EPC guidance, 2026).
what EPC rating you need for a heat pump grant
Comparing heat pump electricity cost to a gas boiler in 2026
A gas boiler in a typical 3-bed semi uses about 10,000 kWh of gas per year for heating and hot water; at the 2026 gas price of 6.5p per kWh (source: Ofgem price cap, Q1 2026), this costs £650 per year. An air-source heat pump in the same home costs £900–£1,100 per year in electricity, so it is £250–£450 more expensive to run.
However, the BUS grant of £7,500 covers most of the heat pump installation cost, while a new gas boiler typically costs £1,500–£3,000. Over 10 years, the heat pump’s higher running costs (£250–£450 more per year) are offset by the grant savings, making total cost similar or slightly lower for heat pumps in well-insulated homes. If you have solar panels, the heat pump’s electricity cost can drop by 30–50% (source: Energy Saving Trust solar and heat pump integration data, 2026).
Frequently Asked Questions
For most UK homes in 2026, the annual electricity cost is between £500 and £1,100. This is based on Energy Saving Trust average heat demand figures and Ofgem's Q1 2026 price cap of 27p per kWh.
SCOP (Seasonal Coefficient of Performance) measures a heat pump's efficiency. A higher SCOP means less electricity used. For example, a SCOP of 3.0 uses about 4,000 kWh for a 3-bed semi, while a SCOP of 4.0 uses 3,000 kWh, saving around £270 per year according to MCS installer data.
No, heat pumps are generally more expensive to run than gas boilers in 2026. Gas costs around 7p per kWh, while heat pump electricity at 27p per kWh makes running costs higher, though heat pumps can be cheaper in well-insulated homes with a high SCOP, per Ofgem and Energy Saving Trust data.
A 3-bed semi with average insulation uses about 4,000–5,000 kWh of electricity per year for an air-source heat pump with SCOP 3.0. This is based on Energy Saving Trust's 12,000 kWh heat demand divided by the SCOP.
The average electricity price for 2026 is 27p per kWh, set by the Ofgem price cap for Q1 2026. This rate is used to calculate heat pump running costs.
