Abstract: A control method of a thermostatic system for a hot water heater is provided where when the water temperature in the hot water heater is too large, a first electromagnetic valve is controlled to be open and a second electromagnetic valve is controlled to be closed. Gas will be transferred via the first gas room to the second gas room. The control of the electromagnetic valves causes a decrease in gas outflow to the hot water heater. When the water temperature in the hot water heater is too small, the first electromagnetic valve is controlled to be closed and the second electromagnetic valve is controlled to be open. The further control of the electromagnet valves causes an increase in the open degree of a gas outlet valve, hence increasing gas outflow.

Abstract: The present invention proposes a control method of a thermostatic system, especially a control method of a first and a second electromagnetic valves of a thermostatic system of a water heater. When gas outflow output to a main stove is too large, the first electromagnetic valve is controlled to be open and the second electromagnetic valve is controlled to be close. Gas will be transferred via the first gas room to the second gas room. The control of gas charge of the second gas room is thus performed so as to decrease the open degree of the first gas outlet used to output gas to the main stove, hence decreasing gas outflow. When gas outflow output to the main stove is too small, the first electromagnetic valve is controlled to be close and the second electromagnetic valve is controlled to be open. Therefore, gas can not be transferred to the second gas room, and gas in the second gas room can be output via the second gas outlet used to output gas to a pilot flame.