DIN 4709:2011-11

This Standard specifies a procedure for the determination of the Standard efficiency factor of micro-CHP-plants for heating and sanitary warm water preparation. It defines a test specification with different thermal impacts for the heating of the systems. It describes the way determined power requirements for sanitary warm water preparation are included in the Standard efficiency factor according to other Standards. This Standard is valid for systems with and without storages, which do not exceed the nominal heat input of 70 kW and which use - domestic gas and other burnable gases according to G260 or - heating oil according to DIN 51603-1 as fuel. This Standard is valid for micro-CHP-plants, which are defined as a whole unit by the manufacturer.