Cistern, in Particular In-Wall Cistern, for a Toilet or Urinal, and Drinking Water Pipe System Having a Cistern

The invention relates to a cistern, in particular an in-wall cistern, for a toilet or urinal, with a drain valve which has a closure body which can be lifted from a closed position into a flushing position. The closure body is designed as an overflow pipe and has a seal which rests tightly on a valve seat in the closed position, with at least one water intake line, with a valve assembly for letting in drinking water present in the water intake line, with a water discharge line for discharging the drinking water let in by the valve assembly, and with a controller which generates a control signal for actuating the valve assembly as a function of a sensor signal and/or when a predefined time interval has been exceeded since the last withdrawal of drinking water from a cold water or hot water line connected to the water intake line. The valve assembly lets in water from the water intake line as a function of the control signal. According to the invention, the water discharge line is designed in such manner that it discharges the drinking water let in by the valve assembly directly into the overflow pipe. The cistern according to the invention makes it easier to maintain the drinking water hygienic, offers the possibility of carrying out required hygienic flushes with relatively low water consumption and enables a hygienic flushing independent of the flushing water level.