Warm up or cool down with the sleek Silentnight 1500W PTC Heater Whisper-quiet in function so you can nap or work in peace Features an over-heat security system to turn off when it gets too hot Also has a cool air function Powered by PTC (positive temperature coefficient) technology 1500W of heating power  Ideal for the home or the office Compact and modern design Save 80% on the Silentnight 1500W PTC Heater - now 19.99 pounds