Gas water heater with zero cold water function

The utility model discloses a gas water heater with a zero cold water function. The gas water heater with the zero cold water function comprises a machine shell, and a water inlet pipe, a water outlet pipe and a zero cold water pipe are arranged on the machine shell; the heat exchanger is used for water flowing heat exchange; the auxiliary heating module comprises a circulating water pump, an electric heating part and a heating container, the electric heating part is arranged on the heating container and is configured to be electrified to heat water in the heating container, and an inlet of the circulating water pump is communicated with an outlet of the heating container; wherein the heat exchanger, the circulating water pump and the heating container are connected end to end to form a closed-loop internal circulating flow path; the zero cold water pipe, the circulating water pump, the heat exchanger, the heating container and the water outlet pipe are sequentially connected to form an open type outer circul