The entire gas boiler is also equipped with overheating protection (when the water temperature in the furnace is too high, the burner will automatically stop working and buzzer alarm, secondary overheating protection (when the boiler shell temperature exceeds 105 ℃, the secondary circuit will be automatically cut off), to prevent dry burning Water protection (when the boiler water is lower than the extremely low water level, the boiler stops working and sends out a buzzer alarm), boiler leakage protection (the control system will automatically cut off the power after detecting electrical leakage or short circuit).