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Division (a) From 26 September 2018 emissions of nitrogen oxides, expressed in nitrogen dioxide, of water heaters shall not exceed the following values:

United Kingdom

Original text. Later amendments are not shown.

  • conventional water heaters using gaseous fuels: 56 mg/kWh fuel input in terms of GCV,

  • conventional water heaters using liquid fuels: 120 mg/kWh fuel input in terms of GCV,

  • heat pump water heaters equipped with external combustion using gaseous fuels and solar water heaters using gaseous fuels: 70 mg/kWh fuel input in terms of GCV,

  • heat pump water heaters equipped with external combustion using liquid fuels and solar water heaters using liquid fuels: 120 mg/kWh fuel input in terms of GCV,

  • heat pump water heaters equipped with an internal combustion engine using gaseous fuels: 240 mg/kWh fuel input in terms of GCV,

  • heat pump water heaters equipped with an internal combustion engine using liquid fuels: 420 mg/kWh fuel input in terms of GCV.