Heat Pump Savings Calculator
Work out how much you could save each year by switching from gas, oil, LPG or electric heating to a heat pump. Uses Ofgem April 2026 prices and the £7,500 government grant.
1. What heats your home today?
Pick whichever your main heating uses.
Add up last year's bills, or use the typical figure for your home below.
3. What size is your home?
We use this to estimate the size of heat pump you'd need.
4. Do you have solar panels?
Free electricity from your roof cuts what the heat pump costs to run.
5. Your options
Most homes qualify for both. Leave them on unless you know they don't apply.
Your estimated saving
£230a year
Over 15 years that's around £3,456 off your heating bills.
Now: Gas boiler
£1,300 / year
With heat pump
£1,070 / year
You save
£230 / year
What about the upfront cost?
- Heat pump install (typical)
- £11,000
- Less government grant
- -£7,500
- You pay
- £3,500
- A new gas boiler would cost
- ~£2,750
If your boiler needs replacing anyway, the heat pump costs about £750 more upfront - earned back in roughly 3.3 years from running cost savings.
Like the look of £230 a year?
These are estimates. The only way to know your real saving is a free quote from an MCS-certified installer. Takes 2 minutes, no obligation, no pushy sales calls.
How we worked this out
Energy prices: Ofgem price cap for April-June 2026 (Direct Debit, GB average): gas 5.74p/kWh, electricity 24.67p/kWh. Heat pump tariff blended at 20p/kWh (typical for E.ON Next Pumped, EDF Heat Pump Tracker, Cosy Octopus on a heat pump load profile). Heating oil 11.21p/kWh (116p/litre ÷ 10.35 kWh/litre, April 2026). LPG 11p/kWh midpoint of typical UK domestic range.
Heat pump efficiency:Seasonal performance factor (SCOP) of 3.5. The real-world average across 252 monitored UK heat pumps on heatpumpmonitor.org is 3.87 (January 2026), so we've picked a deliberately conservative figure.
Typical bill ranges: Gas 3-bed £1,000-£1,400, oil £1,500-£2,000, LPG £1,400-£2,200, electric storage heaters £1,500-£2,500 (Uswitch, retrofitplanner.co.uk, Checkatrade 2026). Oil and LPG homes pay roughly twice as much per unit of heat as gas, which is why the saving from switching to a heat pump is bigger.
Solar: A typical UK 4kW system generates around 3,800 kWh/yr. Without a battery the heat pump can self-consume around 1,000 kWh of that; with a battery shifting midday surplus into morning and evening, around 1,700 kWh.
Install costs: Energy Saving Trust 2026 typical range £10,000-£13,000 by home size. New gas boiler ~£2,750 (UK average, Checkatrade 2026). The £7,500 grant is the Boiler Upgrade Scheme (gov.uk) for England and Wales.
Estimates only. Your actual saving depends on the installer, flow temperatures, your home's heat loss and your electricity tariff. Always get a heat loss survey from an MCS installer for an accurate quote.