8 kW Ground Source Heat Pump running cost — Mild winter day (8 h)
A 8 kW Ground Source Heat Pump (COP 3.5, BEIS data) draws 2.29 kW of electricity per hour. Running 8 hours/day uses 18.3 kWh and costs £4.77/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
8 kW Ground Source Heat Pump — Mild winter day (8 h): 8 kW ÷ COP 3.5 = 2.29 kW electricity draw × 8 h = 18.3 kWh/day = £4.77/day. Weekly: £33.42. Annual: £1742.66. Context: UK winter (Nov–Mar), outdoor temp 5–10°C. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £4.77
- Per week
- £33.42
- Per month
- £145.22
- Per year
- £1742.66
System specification
- Heat output
- 8 kW
- Type
- Ground-source (GSHP)
- Seasonal COP
- 3.5
- Electricity draw
- 2.29 kW/h
- Daily kWh
- 18.3 kWh
- Scenario
- 8 h/day
BEIS Heat Pump Information Note 2024 — 8 kW GSHP, typical SCOP 3.5
How the cost is worked out
- Electricity draw per hour: 8 kW ÷ COP 3.5 = 2.29 kW.
- Daily kWh: 2.29 kW × 8 h = 18.3 kWh.
- Daily cost: 18.3 kWh × 26.11p/kWh = £4.77.
- Weekly: £4.77 × 7 = £33.42.
- Annual: £4.77 × 365 = £1742.66.
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COP 3.5 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).