Heat from Chemical Processes
European Commission - Eurostat

International Energy Agency (IEA)
Refers to only the heat originating from processes without input energy, such as a chemical reaction (e.g. the treatment of zinc oxide ore with hydrochloric acid). Note that waste heat originating from energy driven processes is not considered as a primary energy source. Therefore, it should be reported as heat produced from the corresponding fuel.

United Nations Economic Commission for Europe (UNECE)
Refers to only the heat originating from processes without input energy, such as a chemical reaction (e.g. the treatment of zinc oxide ore with hydrochloric acid). Note that waste heat originating from energy driven processes is not considered as a primary energy source. Therefore, it should be reported as heat produced from the corresponding fuel.