Water supply device

A method for sterilizing a pipeline that is used in a draw-off mode for conveying water with a temperature below 65° C. to a draw-off point and that is in fluid communication with a hot-water tank discharge of a hot-water tank of a water supply device, wherein the hot-water tank is arranged for keeping hot water at a temperature of at least 90° C. and comprises a hot-water tank feed for supplying fresh water to the hot-water tank, wherein the water with a temperature below 65° C. to be supplied in the draw-off mode comes at least partially from the hot-water tank,

• wherein an inlet valve is provided that is arranged to allow or to block inflow of fresh water into the hot-water tank, and a draw-off valve that is arranged to allow or to block outflow of water with a temperature below 65° C. from the line for conveying water with a temperature below 65° C. to the draw-off point,
• wherein a return pipe is provided, which connects the pipeline for conveying water with a temperature below 65° C. to the hot-water tank for returning water from the line for conveying water with a temperature below 65° C. to the hot-water tank,
• wherein a return pipe valve is fitted in the return pipe to allow or to block flow of water through the return pipe, and
• wherein a pump is provided for at least pumping water through the return pipe,
• wherein the method comprises
• the at least partial sterilization of the pipeline for conveying water with a temperature below 65° C., comprising the steps
• forming a circulation circuit by blocking the inlet valve and opening the return pipe valve, and
• pumping water round in the circulation circuit, wherein water that is supplied from the hot-water tank into the pipeline for conveying water with a temperature below 65° C. is returned via the return pipe to the hot-water tank.