Heat Pump ROI Calculator
Is a heat pump worth it for your home? Enter your current heating costs, heat pump price and energy tariffs to see annual savings, payback period and 20-year return.
Not sure what size heat pump you need? Use the Heat Loss Calculator first →
Quick Start
Tip: Use your actual heating bill for the most accurate results. Your annual kWh consumption is usually shown on your energy statement.
Project
Current Heating System
Find your annual kWh on your energy bill or gas statement. A typical 100 m² home uses 10,000–18,000 kWh/year for heating.
Heat Pump
Common heat pump questions
Is a heat pump worth it financially?+
For most well-insulated homes, a heat pump pays back within 7–12 years when replacing oil or LPG heating, and 10–15 years when replacing gas. Over 20 years, most installations deliver a positive return, especially as fossil fuel prices continue to rise.
How much does a heat pump save per year?+
Annual savings depend on your current fuel, the heat pump's COP and local energy prices. Replacing oil heating typically saves €800–€1,500 per year. Replacing gas saves less — around €200–€600 — because gas is cheaper per kWh than oil or LPG in most markets.
What is COP and why does it matter?+
COP (Coefficient of Performance) measures how much heat a pump delivers per kWh of electricity consumed. A COP of 3.5 means 1 kWh of electricity produces 3.5 kWh of heat. Higher COP means lower running costs. Air source heat pumps typically achieve 2.5–4.0; ground source typically 3.5–5.0.
What size heat pump do I need?+
Heat pump size is based on your home's peak heat loss in kilowatts. A well-insulated 100 m² home typically needs 5–8 kW. An older, poorly insulated home may need 10–16 kW. Use the Heat Loss Calculator to find the right size before choosing a model.
How the heat pump ROI calculation works
The method
This calculator compares your current annual heating cost against the projected cost of running a heat pump, then applies the net saving against the installed cost to find the payback period and 20-year return.
Current heating cost
Annual kWh × fuel price ÷ boiler efficiency = current annual cost. For example: 14,000 kWh × €0.09 ÷ 0.88 = €1,432/year.
Heat pump running cost
Annual kWh ÷ COP × electricity price + annual maintenance = heat pump annual cost. For example: 14,000 ÷ 3.5 × €0.28 + €200 = €1,320/year.
Payback period
Net installed cost (after grant) ÷ annual saving = payback in years. The 20-year net saving is (annual saving × 20) minus net installed cost.