DIN 18873-15
DIN 18873-15 Methods for measuring the energy consumption of commercial kitchen appliances - Part 15: Double jacketed boiling and quick boiling pans
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2016
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2016