Abstract
Across Europe, the installed heating appliance stock is generally fairly old, with around 60% of the heating appliances being rated within the lowest two classes of the energy label scale. An energy labelling methodology for old appliances has been developed to rate appliances that were installed before the introduction of the EU energy label. The developed methodologies followed the requirements of EU regulations 811/2013 for space heating appliances and 812/2013 for water heaters, allowing for a more transparent message for consumers. Furthermore, policy integration scenarios were set out for the adoption of the energy labelling scheme at the national level in energy support policies that can boost the energy transition of the heating sector.