Heat Pump COP Calculator
Calculate your heat pump's efficiency (COP) and cost per kWh of heat to check if it runs efficiently.
The COP (Coefficient of Performance) shows how efficiently a heat pump converts electricity into heat. Enter heat output, electrical input and electricity price to calculate the COP and heat cost.
Pro tips
- A COP of 3-4 is considered good for air-source heat pumps.
- Lower flow temperatures (e.g. underfloor heating) increase the COP.
Frequently Asked Questions
What's a good COP value for a heat pump?
A COP of 3-4 is considered good – meaning the heat pump delivers 3-4 times more heat energy than the electricity it consumes.
How is COP calculated?
COP = heat output divided by electrical power input. A COP of 3.5 means 1 kWh of electricity produces 3.5 kWh of heat.
Is a heat pump cheaper than a gas boiler?
It depends on the COP and electricity vs. gas prices – with a COP above 3, a heat pump is usually cheaper per kWh of heat, even though electricity costs more than gas.
Why does COP drop in winter?
The bigger the temperature difference between outside air and the desired flow temperature, the more electricity the heat pump needs – so COP drops in cold weather.