ENERGY GUIDE

Heat pump running cost calculator

An air-source heat pump can deliver multiple units of heat per unit of electricity, expressed as its coefficient of performance (COP).

How to compare costs

At 25p per kWh of electricity, a COP of 4 gives an illustrative heat cost of 6.25p per kWh. A COP of 2 gives 12.5p.

What to consider

Actual COP depends on outdoor temperature, heat delivery temperature, defrost cycles and model. Seasonal performance is better for annual comparisons.

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Illustrative energy values and examples are not live supplier quotations. Verify assumptions for your fuel and equipment.