1. Directive (EU) 2018/844 of the European Parliament and of the Council of 30 May 2018 Amending Directive 2010/31/EU on the Energy Performance of Buildings and Directive 2012/27/EU on Energy Efficiency,2018
2. Heat Meters, Part 1: General Requirements,2002
3. EN 1434-1, Heat Meters, Part 1: General Requirements,2007
4. Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the Harmonisation of the Laws of the Member States Relating to the Making Available on the Market of Measuring Instruments (Recast),2014