Multifunctional zero-cold-water heating system

Multifunctional zero cold water heating system Local machine and display panel, the display panel is provided with a display area and keys; the machine is provided with a cold water inlet, a zero coldwater return port, a hot water outlet and a bathtub connector, and a cold water pipeline is connected into the cold water inlet. The cold water pipeline is sequentially connected with a first temperature sensor, a water proportional valve, a water flow sensor and a heating body; a hot water pipe is led out of the heating body; the hot water pipe is sequentially connected with a second temperaturesensor and an electromagnetic valve; a bathtub connector is led out from the electromagnetic valve; the hot water outlet is connected to the hot water pipe and located between the second temperaturesensor and the electromagnetic valve, the zero cold water return port is led out after being externally connected with a one-way valve through the cold water pipe and then connected with a water pump,the one-way valve is in the