5 kW Air Source Heat Pump running cost — Always-on low-modulating (6 h equivalent)
A 5 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 1.85 kW of electricity per hour. Running 6 hours/day uses 11.1 kWh and costs £2.90/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
5 kW Air Source Heat Pump — Always-on low-modulating (6 h equivalent): 5 kW ÷ COP 2.7 = 1.85 kW electricity draw × 6 h = 11.1 kWh/day = £2.90/day. Weekly: £20.31. Annual: £1058.91. Context: Inverter heat pump in modulating mode, UK average. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £2.90
- Per week
- £20.31
- Per month
- £88.24
- Per year
- £1058.91
System specification
- Heat output
- 5 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 1.85 kW/h
- Daily kWh
- 11.1 kWh
- Scenario
- 6 h/day
BEIS Heat Pump Information Note 2024 — 5 kW ASHP, typical SCOP 2.7 for UK climate
How the cost is worked out
- Electricity draw per hour: 5 kW ÷ COP 2.7 = 1.85 kW.
- Daily kWh: 1.85 kW × 6 h = 11.1 kWh.
- Daily cost: 11.1 kWh × 26.11p/kWh = £2.90.
- Weekly: £2.90 × 7 = £20.31.
- Annual: £2.90 × 365 = £1058.91.
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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).