Heating

Heat Pump Savings Calculator

Heat pumps move heat instead of burning fuel, so they can deliver 3–4 units of heat per unit of electricity. This calculator compares the annual running cost of a heat pump against your current heating system.

Your details

Results

Current system annual cost

—

Heat pump annual cost

—

Estimated annual savings

A negative number means the heat pump costs more to run at these prices.

—

Last updated June 30, 2026. Results update automatically as you type.

How it works

Current cost = heat demand ÷ (efficiency ÷ 100) × fuel price. Heat pump cost = heat demand ÷ COP × electricity price. Savings = current cost − heat pump cost. The result is sensitive to the gap between your electricity and fuel prices: where electricity is expensive relative to gas, savings shrink.

Frequently asked questions

What is COP?

Coefficient of Performance — how many units of heat the pump delivers per unit of electricity. A COP of 3 means 3 kWh of heat for every 1 kWh of power.

How do I convert my gas price to per kWh?

Divide your gas cost per unit by the kWh in that unit. Natural gas is roughly 0.036 GJ per therm; many bills already show a per-kWh or per-therm rate you can convert.

Why might a heat pump cost more to run?

If your electricity is very expensive and gas is cheap, the COP may not be high enough to overcome the price gap. The calculator will show this honestly with a negative saving.

These calculators provide general estimates for educational purposes only and are not financial advice. Real-world results depend on factors not captured here. Verify figures independently before making any purchase or financial decision.