scope:

This part of EN 16905 specifies the calculation of the seasonal performance factor for gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat recovery, to be used outdoors.

This document only applies to appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions.

This document only applies to appliances under categories I_2H, I_2E, I_2Er, I_2R, I_2E(S)B, I_2L, I_2LL, I_2ELL, I_2E(R)B, I_2ESi, I_2E(R), I_3P, I_3B, I_3B/P, II_2H3+, II_2Er3+, II_2H3B/P, II_2L3B/P, II_2E3B/P, II_2ELL3B/P, II_2L3P, II_2H3P, II_2E3P and II_2Er3P according to EN 437:2021.

This document only applies to appliances having:

a) gas fired endothermic engines under the control of fully automatic control systems;

b) closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated;

c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 °C during normal operation;

d) where the maximum operating pressure in the:

1) heating water circuit (if installed) does not exceed 6 bar,

2) domestic hot water circuit (if installed) does not exceed 10 bar.

This document applies to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery.