Heat Pump Calculator
Find out if a heat pump is right for your home and how much you could save
Tell us about your property
Your current heating system
Heat pump preferences
Your Heat Pump Results
Recommended Heat Pump Size
Based on estimated heat loss of - kW
Annual Running Cost
Save £-/year vs current system
Carbon Savings
Equivalent to planting - trees
Estimated Installation Cost
After £7,500 grant
Payback Period
Time to recoup investment through savings
Available Grants & Incentives
Boiler Upgrade Scheme (BUS)
£7,500Government grant for replacing fossil fuel heating with a heat pump. Applied automatically by your MCS-certified installer.
- Valid EPC with no outstanding insulation recommendations
- Replacing gas, oil, LPG, or coal heating
- MCS-certified installer required
- Available until March 2028
Common Questions Answered
How noisy are heat pumps?
Modern heat pumps are quieter than you might think. Most air source units produce 42-52 dBA at 1 metre - similar to a quiet conversation or refrigerator hum.
Our recommendation: Place the outdoor unit away from bedrooms and neighbours' windows. Samsung units are the quietest (42 dBA).
Do heat pumps work in cold weather?
Yes! Quality heat pumps work down to -25°C or lower. UK winters rarely drop below -10°C, well within operating range.
Key insight: Efficiency does decrease in very cold weather, but modern inverter-driven units maintain good performance. Daikin units work down to -28°C.
Will I actually save money?
It depends on your current fuel and how efficiently the heat pump can run in your home:
- Oil/LPG users: Typically save 30-50%
- Gas users: Savings depend on flow temperature - underfloor heating or larger radiators help
- Key factor: Running at 35°C flow temp (UFH) gives SPF of 3.8 vs 2.6 at 55°C
Do I need to change my radiators?
Not always, but it helps. Heat pumps work best at lower flow temperatures (35-45°C vs 60-70°C for gas boilers).
Options:
- Keep existing radiators and run at higher flow temp (lower efficiency)
- Upgrade to larger radiators (£1,500-4,000)
- Add underfloor heating where possible (best efficiency)
Ready to take the next step?
Get quotes from MCS-certified heat pump installers in your area
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