Heat Pump Savings Estimator

How the savings estimator works

The estimator combines three datasets: Ofgem’s Q1 2026 price cap (electricity 24.5p/kWh, gas 6.4p/kWh), typical UK heat-demand figures by property type and bedroom count, and a Seasonal Coefficient of Performance (SCOP) of around 3.2 for a well-designed air source install. We subtract the £7,500 Boiler Upgrade Scheme grant from the indicative install cost before calculating payback, so the figure you see reflects real out-of-pocket spend in England and Wales.

What affects your real-world savings

• Insulation quality — loft, cavity and glazing standards shape heat demand more than any other factor.
• Flow temperature design — systems designed for 35–45°C flow run at higher SCOP than 55°C retrofits.
• Tariff choice — heat-pump-specific tariffs like Cosy Octopus or Agile can cut running costs further.
• Property size — larger homes benefit most in absolute terms but pay more upfront.
• Current fuel — savings against oil and LPG are larger than against mains gas.

Next steps

For a more granular breakdown, use the running cost calculator to compare fuel-by-fuel, the BUS eligibility checker to confirm you qualify for the grant, and the heat pump size calculator to estimate the kW rating you’ll need. When you’re ready, get quotes from MCS installers.