The main advantage of ceramic heater units is that they can warm up instantly and it takes very little time for you to feel the heating effects of this type of heater. This design makes them some of the most efficient electric heaters available. A ceramic heater as a consumer product is a space heater that generates heat using a heating element of PTC (Positive Temperature Coefficient) ceramic. Ceramic heaters are usually portable and typically used for heating a room or small office, and are of similar utility to metal-element fan heaters