Since 2008, the EPN (Energy Performance Norm) describes a method how to measure the electrical, auxiliary energy consumption for central heating boilers. A reduction of the EPC (Energy Performance Coefficient) can be determined with the boiler-dependent constants that results from this measurement method. For the current generation of boilers a total EPC reduction of approximately 5% can be achieved.
In 2012, the EPN has been replaced by the EPG (Energy Performance for Buildings). In the EPG a measurement method that allows for a reduction of the Energy Performance Coefficient based om electrical, auxiliary energy consumption measurements is described as well.