CONTINUOUS FLOW DRINKING WATER HEATER, DRINKING WATER HEATING SYSTEM AND METHOD FOR OPERATING A CONTINUOUS FLOW DRINKING WATER HEATER

摘要

The invention relates to a flow-through drinking water heater with a first heat exchanger (4), with a second heat exchanger (6), with a primary line arrangement (8) for connecting the primary sides of the heat exchangers (4, 6) with a heat generator (12), with a secondary line arrangement ( 10) for connecting the secondary sides of the heat exchangers (4, 6) to a hot water circulation line (16) and to a cold water line (18), the primary line arrangement (8) connecting the primary sides of the heat exchangers (4, 6) in series, the secondary line arrangement (10) connects the secondary sides of the heat exchangers (4, 6) in series and connects the cold water pipe (18) through the second heat exchanger (6) to the secondary inlet of the first heat exchanger (4) with a controllable first pump (20) Supply of hot water to the primary side of the first heat exchanger (4) with a controllable second pump (2 2) for supplying hot water to the primary side of the second heat exchanger (6), with a first temperature sensor (24) arranged in the secondary line arrangement (10) for detecting the return temperature in the return of the first heat exchanger (4) and with a control device (26) for detecting the measured values of the temperature sensor (24) and for controlling the first pump (20) and the second pump (22). The technical problem of simplifying and improving the flow-through drinking water heater and a method for operating a flow-through drinking water heater and a system for drinking water heating is solved in that the control device (26) is set up to pump the pump output of the first pump (20) to a predetermined secondary return temperature of the first heat exchanger (4), that the control device (26) is set up to activate the pumping power of the second pump (22) when the total heat transfer power required exceeds a predetermined limit heat transfer power of the first heat exchanger (4), and that the control device (26) is set up to deactivate the pump power of the second pump (20) when the total heat transfer power required falls below the predetermined limit heat transfer power of the first heat exchanger (4).