Heat Pump vs Gas Boiler Calculator
Compare the yearly running cost of an air source heat pump with a gas boiler.
Your result
Updates as you type. Based on 2025/26 UK figures where relevant.
How this is worked out
Boiler cost is heat demand ÷ efficiency × gas price. Heat pump cost is heat demand ÷ SCOP × electricity price. A SCOP of 3 means 3 kWh of heat per kWh of electricity.
Tips
- Find your unit rates and standing charges on your latest bill or in your supplier's app.
- Standing charges are paid every day regardless of usage.
- Always buy materials from the same batch and add a waste allowance for cuts.
Guides for this calculator
- How to Calculate Heat Pump vs Gas Boiler Running Costs in the UK: Step-by-Step Guide
- Heat Pump vs Gas Boiler Running Costs: Common Mistakes, Tips and FAQs
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Frequently asked questions
How does the heat Pump vs Gas Boiler Calculator work?
Boiler cost is heat demand ÷ efficiency × gas price. Heat pump cost is heat demand ÷ SCOP × electricity price. A SCOP of 3 means 3 kWh of heat per kWh of electricity.
Where do the default energy prices come from?
They are typical UK price-cap level figures used as a starting point. Replace them with the rates on your own bill for an accurate result.
Do the DIY calculators include waste?
Most include an adjustable waste allowance. 10% is typical; complex layouts may need 15%.
Are the results exact?
They are estimates. Real usage, weather and installation details will change actual costs.
This calculator gives an estimate for general information. It isn't financial, tax, legal or medical advice. Check official figures on GOV.UK or NHS.uk, or speak to a qualified adviser.