10 kW Air Source Heat Pump running cost — Mild winter day (8 h)
A 10 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 3.70 kW of electricity per hour. Running 8 hours/day uses 29.6 kWh and costs £7.74/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
10 kW Air Source Heat Pump — Mild winter day (8 h): 10 kW ÷ COP 2.7 = 3.70 kW electricity draw × 8 h = 29.6 kWh/day = £7.74/day. Weekly: £54.15. Annual: £2823.75. Context: UK winter (Nov–Mar), outdoor temp 5–10°C. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £7.74
- Per week
- £54.15
- Per month
- £235.31
- Per year
- £2823.75
System specification
- Heat output
- 10 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 3.70 kW/h
- Daily kWh
- 29.6 kWh
- Scenario
- 8 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 × 8 h = 29.6 kWh.
- Daily cost: 29.6 kWh × 26.11p/kWh = £7.74.
- Weekly: £7.74 × 7 = £54.15.
- Annual: £7.74 × 365 = £2823.75.
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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).