Division 3 General conditions for energy efficiency index and consumption of local space heaters:

The useful efficiency values η_th,nom , η_th,min and the direct and indirect heat output values for P_nom , P_min are measured, where applicable.

The energy efficiency index (EEI) shall be calculated as the seasonal space heating energy efficiency in active mode (η_S,on ) corrected for local space heaters using biomass as preferred fuel by a factor taking into account the renewable character of the preferred fuel, and corrected by contributions accounting for temperature controls, auxiliary electricity consumption and permanent pilot flame energy consumption. The energy efficiency index (EEI) is expressed as a figure equivalent to its figure expressed in percentage.