The utility model discloses a multiplexing water installation, including the cistern, the cistern is inside to be equipped with the baffle perpendicularly, and the baffle divide into cold water chamber and hot water cavity two parts with the cistern, runs through the baffle and is equipped with the water pipe, is equipped with the valve on the water pipe, and the baffle surface is provided with control system, and control system is connected with the valve, is provided with the water pump in the cold water chamber, and the water pump connects gradually with filter, basin, and the basin still is connected with the hot -water line, and the port of hot -water line is located the hot water cavity top. The utility model relates to a multiplexing water installation, install simple, with low costs, can the cyclic utilization water resource, reach the purpose that improves the water use rate, can alleviate enterprise's water load simultaneously, consequently have fine spreading value, the temperature sensor, the control unit, the driving motor that set up on the baffle can realize that the automation of valve is opened for refrigerated hot water flows in cold water chamber, and cyclic utilization has overcome the artifical drawback that the valve is wasted time and energy of opening.