If you've got a tower PC the trick is to locate it under your desk . The amount of heat those thing chuck out is amazing.I've got one of the earlier versions from Aldi that cost under £10. No flame effect just a mini fan heater. 400w max - just checked and actually 360w. Works fine to warm my legs under the desk late at night when central heating gone off but it does little more. I actually bought, as it's so small, for use in my Doblo when I make it into a camper and have main hook-up.