Heat Pump Savings Calculator
Calculate annual savings and payback period for replacing your boiler with an air source or ground source heat pump.
Heat Pump Savings Calculator
Your current annual heating bill
Heat Pump COP
3.2
Efficiency rating
Annual Heating Cost
£421.88
With heat pump
Annual Savings
£1078.13
vs current heating
Payback Period
2.3
years (net of BUS grant)
Installation Costs
System & Installation£10000.00
BUS Grant (2025/26)-£7,500
Net Cost£2500.00
Carbon Emissions
Current System9000 kg CO2/yr
With Heat Pump127 kg CO2/yr
Reduction8873 kg
10-Year Cost Comparison
Year 0Current: p0.0 vs Heat Pump: p0.0
Year 1Current: £1500.00 vs Heat Pump: £2921.88
Year 2Current: £3000.00 vs Heat Pump: £3343.75
Year 3Current: £4500.00 vs Heat Pump: £3765.63
Year 4Current: £6000.00 vs Heat Pump: £4187.50
Year 5Current: £7500.00 vs Heat Pump: £4609.38
Year 6Current: £9000.00 vs Heat Pump: £5031.25
Year 7Current: £10500.00 vs Heat Pump: £5453.13
Year 8Current: £12000.00 vs Heat Pump: £5875.00
Year 9Current: £13500.00 vs Heat Pump: £6296.88
Year 10Current: £15000.00 vs Heat Pump: £6718.75
Current System
Heat Pump
Heat Pump Benefits
- Lower running costs (saves £1078.13/year)
- Reduced carbon emissions (save 8873 kg CO2/year)
- BUS grant available: £7500.00
- Payback period of 2.3 years (after grant)
- Works with existing radiators (no major disruption)
- Can provide summer cooling if space-cool capable
- Qualifies for SEG (Smart Export Guarantee) payments if paired with solar
💡 Tips to Maximize Savings
- Improve insulation first (loft, cavity walls, windows) to lower heat demand
- Better insulation = higher heat pump COP = faster payback
- Pair with solar panels for cheaper electricity to run the heat pump
- Install a smart thermostat to optimize heating schedules
- Use time-of-use tariffs: run heat pump during cheap rate periods
- Add thermal storage (immersion tank) to shift heating to off-peak hours
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