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Electric fan heaters work because they have a powerful electric fan inside, which sucks in cold air from the room. The fan then blows the air through an electrically heated element and that hot air then comes out of the fan heater into the room.

Electric convector heaters work in a different way: inside they have large heating elements similar to - but bigger than - the elements inside a bread toaster.

When the electricity is switched on the element gets hot and heats up the air that is all around it.

Because hot air is lighter than cold air, the hot air rises up and comes out, into the room, through the grilles at the top of the heater. Cold air from the room moves in through the grilles at the bottom of the heater to take the place of the cold air, and this process continues for as long as the heater is switched on.

Any movement of air in that way - cold air taking the place of hot air moving up - is called "convection", which is why the appliance is called a convection heater.

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