PTC heater with shell1. Configuration.TypeSpecialtyExcellenceshortcomingOthersAluminium shellAluminium shell, with wire and insulating filmFast heat ... constant temperature, safty, long last time. PTC heater is very appropriate under 260℃ temperature. Main appliances ... : hair straightener, hair curler (crimper), wax melting heater, humidifier, water boiler, liquid warmer, coffee warmer, ...