10 kW Air Source Heat Pump running cost — Spring/autumn shoulder season (5 h)
A 10 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 3.70 kW of electricity per hour. Running 5 hours/day uses 18.5 kWh and costs £4.84/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
10 kW Air Source Heat Pump — Spring/autumn shoulder season (5 h): 10 kW ÷ COP 2.7 = 3.70 kW electricity draw × 5 h = 18.5 kWh/day = £4.84/day. Weekly: £33.85. Annual: £1764.84. Context: UK spring/autumn (Mar–May, Sep–Nov). Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £4.84
- Per week
- £33.85
- Per month
- £147.07
- Per year
- £1764.84
System specification
- Heat output
- 10 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 3.70 kW/h
- Daily kWh
- 18.5 kWh
- Scenario
- 5 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 × 5 h = 18.5 kWh.
- Daily cost: 18.5 kWh × 26.11p/kWh = £4.84.
- Weekly: £4.84 × 7 = £33.85.
- Annual: £4.84 × 365 = £1764.84.
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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).