... For detailed uses of PTC, air heater, hair straightener, hair curler, drink warmer, water heater, vapor generater, read other pages ... .1) After switching on, the initial heating power is large, and then decrease, finally it become steady state. ... loose, power or temperature may be instable. 7) Parallel connection is necessary for two or more PTC connection. Heater with temperature controllerAlumniunm ...