a space heater that transfers heat to the surrounding air by convection
a radiator that supplies a maximum amount of heat by convection , using many closely-spaced metal fins fitted onto pipes that carry hot water or steam and thereby heat the circulating air
A radiator for either hot water or steam heat with many radiation surfaces, such as fins, to increase contact with air moved either by natural or forced convection.
A heating device in which the air enters through an opening near the floor, is heated as it passes through the heating element and enters the room through an upper opening.
A heat exchange device that uses the heat in steam, hot water, or an electric resistance element to warm the air in a room; often called inaccurately, a radiator.