The thermostat of the water heater is mainly used to limit the working temperature of the equipment not to exceed the set value, when the temperature reaches the set value, the thermostat will disconnect the power supply to prevent the equipment from overheating. If the water heater does not have a temperature limiter, when the heating pipe is badly scaled and the heat is not transmitted, it will cause the thermostat to malfunction and continue to heat beyond the set temperature, which will lead to damage to the thermostat and dry burning of the tank for lack of water.