A controller includes a shell, a valve, a temperature-sensitive regulator and a cover. The shell defines an intake, a first space in communication with the intake, a second space in communication with the first space and an outlet in communication with the second space. The valve is installed in the first space for shutting the intake. The temperature-sensitive regulator is installed in the second space for contact with the valve. The cover is used to shut the second space and contact the temperature-sensitive regulator.