About this calculator

How-to: enter annual heat demand in kWh (a typical EU home is 8,000–15,000 kWh/yr), the heat pump's SCOP (seasonal coefficient of performance — 3.0–4.5 is realistic), your electricity tariff and your current fuel cost per kWh. Heat pump electricity = heat ÷ SCOP. Old system fuel = heat ÷ boiler efficiency. Savings = old − new.

Frequently asked questions

What SCOP is realistic?

Modern air-source heat pumps sized correctly achieve SCOP 3.2–4.2 in most of Europe. Ground-source can reach 4.5+. Poorly sized or high-flow-temperature systems drop to 2.5.

Should I include the install cost?

This calculator focuses on running-cost savings. For payback including install and grants, use the Heat Pump ROI calculator.

Why does electricity look expensive?

Per delivered kWh of heat, a SCOP of 3.6 divides the electricity price by 3.6 — so €0.28/kWh electricity delivers heat at €0.078/kWh, cheaper than €0.10/kWh gas.

What does the Heat Pump Savings Calculator do?

Annual running cost and $/€ savings of an air-source heat pump versus your existing gas, oil, LPG or electric-resistance heating. How-to: enter annual heat demand in kWh (a typical EU home is 8,000–15,000 kWh/yr), the heat pump's SCOP (seasonal coefficient of performance — 3.0–4.5 is realistic), your electricity tariff and your current fuel cost per kWh. Heat pump electricity = heat ÷ SCOP. Old system fuel = heat ÷ boiler efficiency. Savings = old − new.

Is the Heat Pump Savings Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Heat Pump Savings Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified hvac & climate professional before committing to a purchase or a job.

What inputs does the Heat Pump Savings Calculator need?

Enter values for: Annual heat demand (kWh), Heat pump SCOP, Electricity price (per kWh), Current fuel price (per kWh), Old system efficiency, Old fuel CO₂ (kg/kWh). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Heat Pump Savings Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.