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Description:The heating element of the metallic PTC electric heater is made from a specific alloy resistance wire of higher positive temperature coefficient. This alloy material has a special performance that the resistance increases at great rate while the input power of PTC heater gets lower if the temperature gets higher, which can stop the temperature from going up. On the contrary, the resistance reduces while the input power of PTC heater gets higher if the temperature gets lower. This performance therefore can make the heater keep constant temperature automatically.