20140237714 | HEAT EXCHANGER, SHOWER TRAY AND METHOD FOR PRODUCING A SHOWER TRAY - A shower tray having a heat exchanger that is arranged beneath the shower tray for recovering heat from waste water in order to heat up clean water, wherein a first heat-exchanger surface is in contact with the waste water and a second heat-exchanger surface is in contact with the clean water, and the first heat-exchanger surface forms the floor, or part of the floor, of the shower tray. The shower tray here is produced from one metal material and, in the region of the tray floor, beneath the shower tray, a base plate made of some other metal is fastened on the tray floor, so as to form a heat-conducting connection to the tray floor is formed substantially over the entire surface of the base plate. Beneath the base plate, tubes are connected to the base plate in an integral manner. The tubes form the second heat-exchanging surface. | 08-28-2014 |