Abstract: The invention relates to a warm drinking water conduit system, with at least one drinking water heater/storage tank for warm drinking water, with a fresh water supply conduit for supplying cold drinking water into the tank and with a heat exchanger connected to a heating circuit and intended for heating the supplied cold drinking water in the tank to a predetermined temperature and for maintaining the warm drinking water temperature in a conduit system connected to the tank and having tapping points for the extraction of warm drinking water, the warm drinking water circulating in the conduit system by means of a pumping device, wherein the drinking water heater/storage tank is tied into the warm drinking water circulation circuit, the circulation temperature in the entire conduit system being maintained at a level such that the warm drinking water is largely free of microorganisms, in particular legionellae, and that the tank is thermally disinfected of microorganisms in rota in a largely reduced conduit bran