PTC heater is very appropriate for constanct temperature heating under 260 degree temperature. self- limit heating. ) Aluminum shell. PTC heater is very appropriate under 260 temperature. Main appliances: hair straightener, hair crimper, wax melting heater, humidifier, water boiler, liquid warmer, coffee warmer, polymer press-coating heater, hot glue gun, chocolate extruder. For details of liquid ...