Until 26 September 2015 Member States may allow the placing on the market and/or putting into service of water heaters which are in conformity with the national provisions in force when this Regulation is adopted regarding water heating energy efficiency and sound power level.

Until 26 September 2018 Member States may allow the placing on the market and/or putting into service of water heaters which are in conformity with the national provisions in force when this Regulation is adopted regarding emissions of nitrogen oxides.

Until 26 September 2017 Member States may allow the placing on the market and/or putting into service of hot water storage tanks, which are in conformity with the national provisions in force upon adoption of this Regulation regarding standing losses.