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Heat Pump vs Gas (SCOP)
Compare an air-source heat pump (SCOP) against a gas boiler for the same annual heat demand — running cost and carbon side by side.
The Ensign ToolboxHeat Pump vs Gas (SCOP)Compare an air-source heat pump (SCOP) against a gas boiler for the same annual heat demand — running cost and carbon side by side.
Heat demand
kWh/yr
Space + hot water delivered to the building — both systems meet this
System efficiencies
—
Seasonal CoP (heat out ÷ electricity in). MCS min ≈ 2.8, typical 3.0–3.5
%
Gas boiler seasonal efficiency. ErP A-rated ≈ 90%
Unit prices
£/kWh
£/kWh
Emission factors
kgCO₂e/kWh
DESNZ/Defra 2026 UK electricity (Scope 2) ≈ 0.13096
kgCO₂e/kWh
DESNZ/Defra 2026 natural gas, Gross CV ≈ 0.18231
Enter the heat demand and system figures to compare