Powered by electricity, oil filled radiators are an incredibly economical form of heater. Oil filled radiator Heaters typically take longer to start to heat the room, but once they start they offer fantastic results. Oil filled radiators use silent convection to heat the room. Oil filled radiators available online from the heater shop Oil filled radiators are the most cost effective electric heater on the market. Shop online for a wide range of Oil filled radiators at the Argos Heaters and coolers shop. Dimplex Oil Filled Radiators are the original plug-in heater and with a totally enclosed heating element, provide a very safe and reliable room heater.