A fuel-gas fast anti-freezing
water heater with an automatic draining function comprises a shell, a water inlet
pipe and a hot water outlet
pipe, and also comprises a normally opened water supplying valve, a normally closed draining valve, a temperature sensor and a controlling device; the water outlet end of the water supplying valve is connected with the water inlet end of the water inlet
pipe; the water inlet end of the water supplying valve is communicated with a
water source; the draining valve is communicated with the water outlet end of the water supplying end; the draining end of the draining valve is provided with a draining interface; the temperature sensor is arranged in the shell; the water supplying valve, the draining valve and the temperature sensor are connected with the controlling device. As such a structure is adopted, during use, a
water source switch is opened, water of the normally opened water
inlet valve enters a steam connecting valve and then enters a heat releasing and exchanging device; when the external temperature is lower and achieves the
freezing point, the temperature sensor sends a
signal to the controlling device, the normally opened water
inlet valve is closed, the normally closed draining valve is opened, rest water in a
heat exchanger is drained by the water inlet pipe and the normally closed draining valve; the fuel-gas fast anti-freezing
water heater with the automatic draining function can achieve the aim of anti-freezing.