Oil Filled Radiators are convection room heaters, which work by electrically heating oil that acts as a heat reservoir. The hot oil heats the metal walls and in turn the surroundings via convection and radiation. The thin fin columns provide a large surface area to allow more air to be in contact with the heater and help rapid transfer of heat into the room. OFR room heater is a safe environment friendly method of heating that does not involve any fuel burning. Oil filled radiators do not reduce oxygen nor do they cause any dryness in the room. Glen Oil Filled Radiator Heaters are designed to provide fast and flexible heating to any indoor space. They are highly efficient, safe and provide long lasting heating. With a 400 W ceramic fan they spread their warmth instantly.