Home energy
Heat pump vs boiler Calculator
Compare annual fuel demand, running cost and simple payback. This free heat pump vs boiler calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Compare annual fuel demand, running cost and simple payback.
Calculated outcomes
- Heat Pump Electricity KWh
- 3,428.57 kWh
- Boiler Fuel KWh
- 14,117.65 kWh
- Heat Pump Cost
- €1,028.57
- Boiler Cost
- €1,411.76
Assumptions and estimates
- Method: Heat pump input = heat ÷ COP. Boiler input = heat ÷ efficiency. Payback = extra capital ÷ positive annual saving.
- Seasonal COP is an assumption, not a product guarantee. Excludes grants, finance, maintenance differences and temperature-dependent performance.
Useful next steps
- Check the payback period against how long you will keep the vehicle.
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the heat pump vs boiler calculation works
Heat pump input = heat ÷ COP. Boiler input = heat ÷ efficiency. Payback = extra capital ÷ positive annual saving.
Seasonal COP is an assumption, not a product guarantee. Excludes grants, finance, maintenance differences and temperature-dependent performance.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review annual saving and simple payback years, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Annual useful heat (kWh)
- 12000
- Seasonal heat pump COP
- 3.5
- Electricity price (€/kWh)
- 0.3
- Boiler seasonal efficiency (%)
- 85
- Boiler fuel price (€/input kWh)
- 0.1
- Extra installation cost (€)
- 5000
- Annual Saving
- €383.19
- Simple Payback Years
- 13.05 years