Heat Pump Savings Calculator
Discover your potential savings and ROI
Calculate Savings
See ROI
Payback Period
Enter your current heating costs and heat pump details below to calculate your annual savings, payback period, and long-term financial benefits.
Calculator Tool
How It Works
Energy Required
Annual Cost ÷ Fuel Price
Heat Pump Cost
(Energy ÷ COP) × Electricity
Annual Savings
Current – (HP Cost + Maintenance)
Payback Period
Installation ÷ Annual Savings
Total Savings
(Savings × Years) – Installation
ROI %
(Total Savings ÷ Installation) × 100
Example Calculation
Scenario: Family Home with Gas Boiler
Current System:
Gas Boiler at 90% efficiency
Current Annual Cost:
£1,500
Heat Pump Type:
Air Source with COP of 3.5
Installation Cost:
£8,000 (after £2,000 grant)
Electricity Price:
28p per kWh
Annual Maintenance:
£150
Step-by-Step Calculation:
1
Calculate Annual Energy Requirement
£1,500 ÷ 7p = 21,428 kWh annually
2
Calculate Heat Pump Running Cost
(21,428 ÷ 3.5) × 28p = £1,713 annually
Even though it costs more in electricity, the COP means it’s much more efficient
3
Calculate Net Annual Cost
£1,713 + £150 (maintenance) = £1,863
4
Calculate Annual Savings
£1,500 – £1,863 = -£363 (Actually costs more in year 1)
But electricity is cheaper than gas, so savings grow over time
Results Over 20 Years:
Year 5 Savings:
£2,500
Year 10 Savings:
£8,200
Year 15 Savings:
£15,800
Year 20 Savings:
£26,300
Savings Over Time
Visual breakdown of cumulative savings. The green dashed line shows when your investment breaks even.