The chart below provides Domestic Annual Heat Pump System Efficiency (DAHPSE) estimates based on data held in the Product Characteristics Database (PCDB) and demonstrates their variation with heat source, dwelling heat loss, emitter design flow temperature and presence of weather compensation. See here for more details.
The chart can be populated by selecting from the table "Heat pump input options". Filter options can be applied as required.
Select & compare real heat pumps below
To provide annual efficiency estimates, an annual combined space and hot water heating duty cycle was developed. This cycle incorporates hourly space and hot water heat load and temperature assumptions for the UK climate. It is based on the standard EN15316-4-2:2017 and the system boundary SEPEMO SPF_H4, it uses EN14825 (Ecodesign) test data - see here for background. A brief background to the calculation method's development is available here. The calculation method is available here and a detailed background document here.
The UCL Energy Institute "Final report on analysis of heat pump data from the renewable heat premium payment (RHPP) scheme", which considered field data for 700 heat pump installation sites in the UK, indicated that 36% of heat pump installations have weather compensation disabled. Therefore, the above chart enables both scenarios (on or off) to be displayed.