... dryer,hand/foot warmer,massager,physical therapy heater. 1) 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 ... gun, chocolate extruder. For details of liquid heater, read another page in this website.2) Ceramic shell. It is ...