Heat extraction device for hot water tank using counter-flow heat exchanger unit with two series heat exchangers and feed device for hot water stored in tank

摘要

The heat extraction device uses a counter-flow heat exchanger unit (2) and a feed device (3) for the hot water stored in the hot water tank (1). The counter-flow heat exchanger unit has 2 series heat exchangers (8,9), the first coupled to the hot water feed path and the second coupled to the hot water return path via a temperature-controlled valve (10), an overflow line (12) leading to the hot water tank coupled to the coupling line (11) between the heat exchangers via a valve (13).