5 kW Air Source Heat Pump running cost — Cold winter day (12 h)
A 5 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 1.85 kW of electricity per hour. Running 12 hours/day uses 22.2 kWh and costs £5.80/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
5 kW Air Source Heat Pump — Cold winter day (12 h): 5 kW ÷ COP 2.7 = 1.85 kW electricity draw × 12 h = 22.2 kWh/day = £5.80/day. Weekly: £40.62. Annual: £2117.81. Context: UK winter (Dec–Feb), outdoor temp < 5°C. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £5.80
- Per week
- £40.62
- Per month
- £176.48
- Per year
- £2117.81
System specification
- Heat output
- 5 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 1.85 kW/h
- Daily kWh
- 22.2 kWh
- Scenario
- 12 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 × 12 h = 22.2 kWh.
- Daily cost: 22.2 kWh × 26.11p/kWh = £5.80.
- Weekly: £5.80 × 7 = £40.62.
- Annual: £5.80 × 365 = £2117.81.
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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).