10 kW Air Source Heat Pump running cost — Cold winter day (12 h)
A 10 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 3.70 kW of electricity per hour. Running 12 hours/day uses 44.4 kWh and costs £11.60/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
10 kW Air Source Heat Pump — Cold winter day (12 h): 10 kW ÷ COP 2.7 = 3.70 kW electricity draw × 12 h = 44.4 kWh/day = £11.60/day. Weekly: £81.23. Annual: £4235.62. Context: UK winter (Dec–Feb), outdoor temp < 5°C. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £11.60
- Per week
- £81.23
- Per month
- £352.97
- Per year
- £4235.62
System specification
- Heat output
- 10 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 3.70 kW/h
- Daily kWh
- 44.4 kWh
- Scenario
- 12 h/day
BEIS Heat Pump Information Note 2024 — 10 kW ASHP, typical SCOP 2.7 for UK climate
How the cost is worked out
- Electricity draw per hour: 10 kW ÷ COP 2.7 = 3.70 kW.
- Daily kWh: 3.70 kW × 12 h = 44.4 kWh.
- Daily cost: 44.4 kWh × 26.11p/kWh = £11.60.
- Weekly: £11.60 × 7 = £81.23.
- Annual: £11.60 × 365 = £4235.62.
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COP 2.7 from DESNZ/BEIS — Heat Pump Information Note: Seasonal Performance Data 2024 (OGL v3.0). Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026).