Heat Pump Calculator

Analyze heat pump efficiency and potential cost savings for your home. Compare with your current heating system to see potential ROI.

Heat Pump Analysis

£/therm

Leave blank for average estimate (£12,000)

Analysis Results

Enter your home details to see heat pump analysis results

  1. 1

    Calculate Your Heat Load

    Determine annual heating requirement in kWh. Use energy bills or basic calculator. Average UK home: 10,000-15,000 kWh/year (well-insulated), 15,000-25,000 kWh/year (average), 25,000+ kWh/year (poor insulation). Heat pumps work best in well-insulated homes.

  2. 2

    Select Heat Pump Type

    Choose between air-source heat pump (ASHP, £8,000-£14,000 installed) or ground-source heat pump (GSHP, £20,000-£35,000). ASHPs easier to install, GSHPs more efficient but need garden space. Both eligible for Boiler Upgrade Scheme grants (£7,500 for ASHP, £6,000 for GSHP as of 2024).

  3. 3

    Enter Current Heating Costs

    Input current annual heating bill in pounds. Check gas/oil/electric statements. Include standing charges. Average UK: £800-£1,500/year for gas central heating, £1,500-£3,000/year for oil or electric. Heat pump savings depend on replacing expensive fuel.

  4. 4

    Input Electricity Rate

    Enter current electricity price per kWh (typically £0.24-£0.34/kWh on standard tariff). Consider Economy 7 or heat pump-specific tariffs (£0.15-£0.25/kWh off-peak). Lower rates improve heat pump economics significantly.

  5. 5

    Set Heat Pump Efficiency (COP)

    Enter Coefficient of Performance: ASHP typically 2.5-3.5 (produces 2.5-3.5 kWh heat per 1 kWh electricity), GSHP 3.5-4.5. Higher COP = lower running costs. Well-designed systems in insulated homes achieve higher COPs. Modern ASHPs maintain good efficiency even at -10°C.

  6. 6

    Review Investment and Savings

    Calculator shows total installed cost (minus £7,500 BUS grant), annual running cost, savings vs current system, and payback period. Factor in: reduced carbon emissions, increased home value, 20-25 year system lifespan, and independence from fossil fuels. Best ROI when replacing oil, LPG, or electric heating in well-insulated homes.

Pro Tip: Use Ctrl+Enter to calculate quickly, or Ctrl+R to reset the form.

Frequently Asked Questions

A heat pump transfers heat rather than generating it. It extracts heat from outside air (even in cold weather) or ground and moves it indoors - highly efficient because it moves existing heat instead of creating it.

COP (Coefficient of Performance) measures heat pump efficiency. A COP of 3.0 means you get 3 kW of heat for every 1 kW of electricity - 300% efficiency! Higher COP = lower operating costs.

Modern heat pumps work efficiently down to -15°C to -25°C. Below this, efficiency drops. In very cold regions, consider ground-source heat pumps or hybrid systems.

Air-source: lower cost (£8k-£15k), less efficient in extreme cold. Ground-source: higher cost (£15k-£30k), superior efficiency year-round. COP: air-source 2.5-3.5, ground-source 3.5-4.5.

Air-source: 15-20 years. Ground-source: 20-25 years (indoor unit), 50+ years (ground loop). Annual professional servicing extends lifespan.

Yes, if: high heating costs, pay over £0.15/kWh, moderate-to-cold climates, stay 7+ years, access grants. Typical savings: 30-50% annually. Most systems pay back in 8-15 years.

How Heat Pump Analysis Works

Our heat pump calculator compares your current heating system with modern heat pump technology

Efficiency Analysis

Calculate COP and SCOP ratings based on your climate zone and heat pump type

Cost Comparison

Compare operating costs with gas, oil, electric resistance, and propane systems

ROI Calculation

Determine payback period and long-term savings potential for your investment

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