Heat pump vs gas cost calculator
Heat pump vs gas: compare heating costs. Enter your yearly heat demand, electricity and gas prices, boiler efficiency and the pump's SCOP — the calculator shows which is cheaper, by how much, the cost of 1 kWh of heat, and the SCOP at which the pump wins.
Runs in your browser — nothing is uploaded to a server
How much heat your home needs per year. Take it from an energy audit, past bills or estimate from floor area.
Average efficiency across the season. Usually 3–4; depends on climate and heating type.
Old boiler 80–88%, modern condensing 90–98%.
How to use it
Enter heat demand and SCOP
Your home's yearly heat demand (kWh) and the pump's seasonal COP. Don't know the SCOP? Tap “Don't know your SCOP?” and pick a heating type.
Add prices and boiler efficiency
Electricity price, gas price (per kWh or per m³) and your gas boiler efficiency. This is critical: without efficiency and gas units the comparison is inaccurate.
Compare and dig in
See which is cheaper and by how much, the cost of 1 kWh of heat and the SCOP at which the pump wins. Installation payback is under “advanced”.
Why it's useful
A heat pump saves through efficiency: for each kWh of electricity it delivers 3–4 kWh of heat. But electricity costs more per unit than gas, so the win isn't obvious — it comes down to the price ratio, the pump's SCOP and your boiler efficiency.
The calculator does the honest math: it divides heat demand by the SCOP and multiplies by the electricity price for the pump; for the boiler it divides by efficiency and multiplies by the gas price (converting from m³ if needed). Then it shows a full comparison rather than one number: yearly and monthly costs, the cost of 1 kWh of heat, and the SCOP break-even point.
FAQ
A 90%-efficient boiler burns not 10,000 but about 11,111 kWh of gas to deliver 10,000 kWh of heat. And gas is often priced per m³, not per kWh. Without these two, the comparison looks precise but can be wrong.