Safety
Electric fan heaters are unsealed appliances with live electric parts inside, so are not safe to use in wet or very humid conditions, due to risk of a short circuit leading to fire, or electrocution due to access to electrically live parts. Electric fan heaters usually have a thermal fuse close to the element(s) to protect against fan failure causing overheating and possibly fire. Steel-cased heaters perform better in potential fire-causing faults than plastic-cased ones, since the case will stay whole and not burn.
Portable fuel-powered fan heaters release all the fumes of combustion into the room, creating a risk of poisoning by carbon monoxide and carbon dioxide. Most installed fuel fan heaters in the first world use a heat exchanger and external ventilation, avoiding this risk, and dumping the water vapour from combustion outdoors.
Read more about this topic: Fan Heater
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