Space heaters are electrical appliances that are used to provide warmth in a room or area. They are typically used in colder climates, or during the winter months, to supplement a home's heating system. The most common type of space heater is the 'SUN' heater, which uses infrared radiation to warm the air in a room. SUN heaters are usually powered by electricity, but some models can also be powered by natural gas or propane.