Arrangement and method for providing warm water comprising a heat exchanger

Arrangement for providing hot water - a primary circuit (10) providing end with a fluid, a warm or hot fluid (11) having a buffer with temperature-dependent layered portions of the primary fluid or a water-conducting pipe system of a heating system of a building or a connected Nahund district heating network, and a conveyor ( 14) for the fluid, - a secondary circuit (20) for the drinking water to be heated, - a heat exchanger (50) for transferring heat from the fluid of the primary circuit (10) to the drinking water in the secondary circuit (20), - a line (13) in the primary circuit (10), the fluid from the heat exchanger (50) for means (11) returns, - with a control device (30) for the conveyor (14), - with at least one temperature sensor (57) in the primary circuit (10) or secondary circuit (20) whose measuring values ​​of the control means (30) are fed, - with a circulation circuit (40) in the secondary circuit (20), which circulation circuit (40) comprises a conveyor (44) and is designed such that it provides constantly already heated drinking water in a hot water outlet (23) of the secondary circuit. characterized, that a conveyor (70) or a controllable valve (72) in combination with the conveyor (44) in the circulation circuit (40) is provided, that the conveyor (70) or the controllable valve (72) after completion of a draw-off (in the circulation circuit 40 ) is turned on and a defined amount of water from the circulating circuit (40) the secondary side (in the cold water inlet 22) of the heat exchanger (50) or (in a cold water circuit 101) performs.