10 kW Air Source Heat Pump running cost — Domestic hot water only (2 h)
A 10 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 3.70 kW of electricity per hour. Running 2 hours/day uses 7.4 kWh and costs £1.93/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
10 kW Air Source Heat Pump — Domestic hot water only (2 h): 10 kW ÷ COP 2.7 = 3.70 kW electricity draw × 2 h = 7.4 kWh/day = £1.93/day. Weekly: £13.54. Annual: £705.94. Context: Summer use, hot water production only. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £1.93
- Per week
- £13.54
- Per month
- £58.83
- Per year
- £705.94
System specification
- Heat output
- 10 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 3.70 kW/h
- Daily kWh
- 7.4 kWh
- Scenario
- 2 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 × 2 h = 7.4 kWh.
- Daily cost: 7.4 kWh × 26.11p/kWh = £1.93.
- Weekly: £1.93 × 7 = £13.54.
- Annual: £1.93 × 365 = £705.94.
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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).