HEATER

摘要

There is provided a heater for a room heating system. The heater comprises a heating element and a housing for the heating element. The heater includes a thermal distribution fluid inlet into the housing and a thermal distribution fluid outlet from the housing. The housing is arranged for containing the thermal distribution fluid as it follows a flow path from the inlet to the outlet and over the heating element. The heater further comprises at least one safety feature of the room heating system, which is mounted to the housing and is responsive to the fluid contained by the housing. The heater is a backup heater in a room heating system mostly powered by a heat pump.