The Clarke Devil 2000PTC features a composite aluminium & ceramic PTC (positive temperature coefficient) heater element. This means: - Rapid heating of the element Self-regulating temperature - Heating power is controlled by the air flow Uniform heating with minimal power variation With its minimal warm up time, the Devil 2000PTC ceramic heater is an easy and convenient way to quickly warm rooms. Variable heat output means a constant, comfortable room temperature can be easily maintained.