Heating and method for controlling a heating

摘要

The present invention relates to a heating comprising a circuit for flowing a working fluid at a set flow temperature (Ts) to a heat emitting section (30), an electricity driven heat pump (20) having a first heat exchanger (22) connected to the circuit for heat transfer to the fluid, a fuel fired boiler (10) having a second heat exchanger connected to the circuit for heat transfer to the fluid downstream of the first heat exchanger (22) and a control configured to determine the coefficient of performance (COP