This isn't the cheapest fan heater you can get, but it is probably worth paying a little extra because of its appearance and construction, and its features.
It's surprisingly nicely made, with a smooth but rigid plastic shell and a painted metal grille. the controls are crisp and easy to use too. It feels like a quality item that'll take a few kicks (I always end up tripping over my fan heaters!).
Some reviewers complain about the noise of the fan, but to me it seemed quieter than previous heaters I've used, which have tended to grind and rattle; this has a smooth sound (though perhaps they all do when new).
If you want to use it to keep a room frost free, there's a special setting for that; there's a cold air setting for hot days too.
Otherwise you just set the thermostat wheel and leave it to its own devices. It switches itself on and off to maintain the room at an even temperature.
Being 3Kw, which I think is the highest rating you can plug into a standard socket, it's capable of heating quite a large room. I'm using mine in my loft, which is a chilly 20 x 18 feet. Even so, it heats the room up pretty quickly on a cold winter's day. The only snag is the knowledge that the electricity meter is spinning nearly as fast as the fan...