Heat Pump Efficiencies (COP)
System efficiencies vary between installations and the parts used. Your property’s energy efficiency is also a hugely important factor to consider when calculating potential system efficiencies.
The efficiency (coefficient of performance or COP - sometimes CP) of the system itself (the ratio between the electricity invested in order to run the heat pump and the pump’s output) varies between the types of system used.
Ground source heat pumps tend to have an efficiency of between 2.5 and 3 (that is, 3 units of heat generated per unit of power needed to drive the system). Air source heat pumps can be slightly less efficient, with an average efficiency of between 1.5 and 3. However it must be noted that these figures are increasing as technologies advance and it is likely that manufacturer’s claims on a products' COP will be very much a ‘best case scenario’.
System efficiency is dependent on other factors, however, such as the quality of the installation, the system owner’s competency in maximising the system output, and the property’s energy needs and efficiency.
Coefficient of performance (COP) Heating Equation