The Energy Related Products Directive (ErP) is a piece of European legislation setting minimum efficiency standards for energy using equipment. As of September 26th 2015 this will extend to heat pumps and other heating sources.
The energy efficiency categories for heating heat pumps are based on a seasonal coefficient of performance (SCOP). This depends firstly on the climatic region and secondly on the potential heating system. Europe is divided for this purpose into three climatic regions. For radiators and underfloor heating systems, the different flow temperatures and possible energy efficiency categories are shown on the Energy Labels.
Stand-alone heat pumps are rated a maximum of A++ and as part of integrated system can be rated as an A+++. Heating boilers (oil, gas, bio-mass) on the other hand are rated A at best, and in some cases as low as C or D. If the end-user is interested in top efficiency that is A+++ energy class rating they should look at heat pump as part of an integrated system.
The rating system for heat pumps classifies them into nine efficiency
categories. The best category is A++ and A+++. The labels are applied to heat
pumps as single source of heating, and combined with domestic hot water
preparation as well as the whole integrated system, including solar thermal
power, temperature control, etc.Domestic Danfoss air and ground source heat pumps
come with the highest rating from A+ up to A+++ depending on the model, receivers and integrated system.