Hot water heating system, with primary and secondary heat transfer units, has a single recirculating pump and a pump drive for the secondary circuit powered by the water flow in the heating circuit

摘要

The heating system especially for hot water, has a primary heat transfer unit (11) linked to a heating circuit (12), and a secondary heat transfer unit (21). The flow of liquid to be heated is connected to the primary side of the heating circuit and the secondary side of the secondary circuit (24), with a flow generated by a recirculating pump (15). A drive (31) is at the heating circuit, powered by the liquid flow through the heating circuit to operate a pump (32) to give a recirculating flow through the secondary circuit.