Usha 3609FS PTC 2000-Watt Oil Filled Radiator (White) Usha's Oil Filled Radiators are made to provide with the highest heating efficiency and the most comfortable experience. Using PTC heating technology and unique wave style fins, these heaters provide safety, faster and longer lasting heating and power saving, thus making them one of the best products in their class. They are also equipped with fans for instant heating of the room.