Heat originating from processes without input energy, such as a chemical reaction. Excludes waste heat originating from energy driven processes, which should be reported as heat produced from the corresponding fuel.

• Regulation (EC) No 1099/2008 of the European Parliament and of the Council of 22 October 2008 on energy statistics
  Place of publication: (Dz. Urz. UE L 304 z 14.11.2008, str. 1, z późn. zm.)