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Afan heater, also called ablow heater, is aheater that works by using afan to pass air over a heat source (e.g. aheating element).[1] This heats up the air, which then leaves the heater, warming up the surrounding room. They can heat an enclosed space such as a room faster than a heater without a fan,[2] but like any fan, create a degree ofnoise.
Electric fan heaters can be cheaper than other heaters due to simple construction.[3] The fan carries heat away from the device, which can be made smaller without overheating. The relatively small amount of electricity used to operate the fan is converted to additional heat, so that efficiency remains at 100%.
Electric fan heaters can be more expensive to run than fuel powered heaters due to the cost of electricity.[3] This makes them best suited to occasional use rather than as regularly used heat sources.
Residential electric fan heaters are limited in capacity by the voltage of the electrical system. In 110/120 V countries, 15 A is a typical maximum, which results in many models being 1.5 kW. In 220/230 V countries, 3 kW is a maximum, however 2 kW is commonly used as it is adequate for most cases. Industrial fan heaters can draw more power than smaller commercial models.
Most modern fan heaters have a power setting to determine power output. Some also have athermostat which switches off heating when the desired ambient temperature is reached. They do not maintain perfect room temperature control, since:
While the fans in fan heaters are electrically powered, various heat sources may be used:
Electric fan heaters are unsealed appliances with live electric parts inside, so they are not safe to use in wet environments because of therisk ofelectrical injury if moisture provides a conductive path to electrically live parts. Electric fan heaters usually have athermal fuse close to the heating element(s) to prevent overheating damage in the event of fan failure or air intakes becoming blocked, and a tip-over switch to shut the heater off when the fan outlet is not in the required orientation. Metal-cased heaters may perform better in the case of possible fire-causing faults than plastic-cased ones, since the case will stay intact and is not flammable, but the metal case presents a higher risk of electric shock if a heater malfunctions.
Portablefuel-powered fan heaters release all the fumes ofcombustion into the room, creating arisk of poisoning bycarbon monoxide andcarbon dioxide. Most installed fuel fan heaters in thefirst world use aheat exchanger and external ventilation, avoiding thatrisk by venting thecombustion gases to the outdoors.
The picture immediately to the right (the top on the mobile site) shows most of the component parts of a typical plug-in electric fan heater.
The next picture shows the two overheat cutouts. The bimetal cutout (left) operates if the device overheats because the intake is blocked or the fan fails, and resets automatically or manually depending on specification, once the heater cools after the operational fault is corrected. The thermal fuse (right) is afail-safe backup device that will blow and disconnect theheating element permanently should the bimetal cutout fail to operate (e.g. due to its contactswelding together) and in so doing prevent extreme overheating which could result in a fire.
Industrial fan heaters use high-output finnedheating elements in front of a fan to provide a larger airflow and higher kilowatt rating than many smaller residential fan heaters.Industrial fan heaters can be used inwarehouses,shipping containers,clean rooms, shops and other general purpose heating applications.They can also be used asdryers ordehumidifiers with modified attachments or mountings. Portable industrial fan heaters tend to range from around 1.5 kW up to about 45 kW with eitheraxial orcentrifugalfans and various staged controls and over-temperature safety limit controls.
