Hot-water central heating system with service water preparation

摘要

The central heating system has a boiler (5) and an external water heater (11) heated by the latter as well as a water-pump heating system. The water-heater heating system (10, 12) is designed as a gravity heating system. The circulating pump (17) of the water-pump heating system is switched on and off by a service-water temperature sensor (18) in the water heater (11). Above a first temperature, the circulating pump (17) switches on and, below a predetermined second temperature, it switches off. A flow reversal in the water-heater heating system (10, 12) is prevented by a locking member (13). A heat flow from the water heater (11) into the water-pump heating system is prevented. <IMAGE>