Zero-cold-water water heater system

The utility model relates to a zero-cold-water water heater system which comprises a water pipeline and a water heater. The water heater is provided with a water pump, a controller, a water outlet and a water inlet. The water using pipeline at least comprises two pipeline units used for being connected with water using points. Each pipeline unit is connected with the water outlet and the water inlet so as to form a hot water circulation loop with the internal pipeline; the controller is used for receiving water flow signals of the water flow sensing devices and controlling the electromagnetic valves on the hot water circulation loops corresponding to the water flow sensing devices to be opened and closed. The controller controls the electromagnetic valves on the circulation branches to be opened and closed according to water flow signals of the water flow sensing devices, and the problems that due to the fact that water using points are located in the same preheating circulation loop, laying is complex, and h