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Heat Pump Cost Calculator: Annual Running Cost and CO₂
Enter useful annual heat demand in kWh or million BTU, or estimate it from the heating share of a fuel bill. Compare four heating systems with your own prices and CO₂ factors.
Heat Pump Cost Calculator: Annual Running Cost and CO₂: Divides the same useful heat demand by each system's SCOP or efficiency, then multiplies input energy by its tariff and CO₂ factor. Bill-derived demand is bill divided by unit price, times unit energy and old heater efficiency. Fixed charges, installation and maintenance are excluded. Prices and factors start blank, with labelled placeholders. For appliance energy, use the [electricity cost calculator](/electricity-cost-calculator). Runs 100% locally in your browser with zero server file uploads.
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For a bill in kWh, enter 1 kWh per unit. For litres or gallons, enter the supplier's energy per litre or gallon. Use only the heating share of the bill and exclude standing charges, cooking and other uses.
All prices and CO₂ factors are your inputs. Blank fields must be filled; placeholders are examples, not local tariffs. Currency changes the label only. Enter oil price per kWh of fuel: price per litre or gallon ÷ kWh per litre or gallon.
SCOP 3.0 means 3 kWh of useful heat per kWh of electricity over a season. Try 2–4 as an editable sensitivity range, not a guarantee: climate, flow temperature, defrosting and backup heating affect performance. Use a measured seasonal value when available. The two electric systems share one tariff and grid factor.
Enter finite numbers within the supported range.
Seasonal performance
UK Government Energy Technology List defines SCOP as reference annual heating demand divided by annual heating electricity. The 3.0 default and 2–4 sensitivity range are scenario assumptions, not a promised efficiency. Source: https://etl.energysecurity.gov.uk/products/heat-pumps/air-water-heat-pumps
Energy balance and units
Useful heat equals fuel input energy times heater efficiency. Cost equals input kWh times its price, and emissions equal input kWh times an entered factor. One kWh is approximately 3412.142 BTU (International Table). Unit background: https://www.nist.gov/pml/special-publication-811
How to use it
- Enter useful heat demand, or a heating-only fuel bill with its price, energy content and old heater efficiency.
- Fill in prices, CO₂ factors, boiler efficiencies and seasonal COP; select a currency label.
- Compare annual input energy, running costs and emissions.
Privacy & limitations
Bills, prices and energy inputs stay in your browser.
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Frequently asked questions
What does SCOP 3 mean?
It means 3 kWh of useful heat for each kWh of electricity over the heating season. The default is an example. Try 2–4 for sensitivity, and use local measured seasonal performance where available; climate, flow temperature, defrosting and backup heat affect it.
What prices should I enter?
Use your tariff per input kWh. For oil sold by litre or gallon, divide the unit price by its kWh content. The two electric systems share one tariff and grid factor. Changing currency does not convert money.
Are the emissions lifecycle totals?
They include exactly the boundary in the factors you enter. Use consistent direct CO₂ or lifecycle CO₂e factors. Installation and embodied emissions are excluded.
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