Boiler vs Heat Pump Running Cost Calculator
Compare estimated annual and longer-term running costs for a gas boiler and a heat pump using your home's heating demand, local climate, and energy price assumptions.
Boiler vs Heat Pump Running Cost Calculator
Compare estimated annual and longer-term running costs for a gas boiler and an air source heat pump using your home heating demand, local climate, and current energy price assumptions.
Live default rates source: Ofgem regional price cap tables for Great Britain (loading period). Last refresh: pending.
Expand advanced assumptions if you want to fine-tune the estimate for your home, tariff, or system preferences.
1. Boiler To Compare
2. Energy Price Defaults
Loading latest Ofgem defaults...
3. Home and Heating Assumptions
Advanced Assumptions
Advanced controls include time-of-use electricity, auxiliary loads, standing-charge treatment, manual tariff overrides, and discounted cashflow assumptions.
5. Download Your Cost Comparison
Create a customer-friendly PDF summary of the current running-cost comparison and assumptions.
Estimated Running Costs
Where These Costs Come From
- Gas boiler gas input
- 16,304.35 kWh/year
- Gas boiler auxiliary electricity
- 140 kWh/year
- Heat pump compressor electricity
- 4,747.47 kWh/year
- Heat pump auxiliary and immersion
- Aux: 260 kWh | Immersion: 120 kWh
- Gas bill components
- Gas: £935.87 | Aux elec: £34.54 | Standing: £106.18 | Service: £120.00
- Heat pump bill components
- Compressor: £1,171.20 | Aux elec: £64.14 | Immersion: £29.60 | Standing: £0.00 | Service: £220.00
- Heat pump effective electricity rate
- 24.67 p/kWh
- Standing-charge assumption
- Gas removed with heat pump: Yes | Shared electricity standing included: No
Longer-Term Estimate (15 years)
How This Estimate Is Built
Gas boiler running cost includes gas use, any boiler pump and control electricity, standing charges kept in the scenario, and annual servicing.
Heat pump running cost includes compressor electricity, pumps and controls, any immersion top-up, standing charges kept in the scenario, and annual servicing.
If manufacturer mode is enabled, heat pump efficiency is adjusted for local climate severity, flow temperature, and hot-water temperature assumptions.
The longer-term estimate increases energy and maintenance costs each year using the assumptions entered above, so future cost differences can be compared more realistically.