... aluminum, brass, ceramic, stainless steel.Some samples of uses.Heating water for shower, ducking bath, footbath, washing hand, ... or other liquid.Notice in appliance.PTC as a heating element, it fits for high safety, slap-up product. ... , and using high heat-conducting materials such as copper or aluminum. The higher is the temperature of water ... www.tiancheng-ptc.com/ptc4.html PTC heating element for water