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Electric fan heaters can be less expensive to buy than other heaters, as the fan carries heat away from the device, which can be made smaller without overheating. The relatively small amount of electricity used to turn the fan is converted to additional heat, so that efficiency is not a problem: all heaters, including fan heaters, without external ventilation are 100% efficient, meaning that all energy input goes into the room as heat. However their main downside is that electric fan heaters are significantly more expensive to run than fuel powered heaters due to the cost of electricity. This makes them best suited to occasional use rather than as regularly used heat sources.