The inquirer has a preview of a new computer power supply that is rated at 850W with a peak of 950W. This is almost a whole kilowatt!
Who needs heating? Just install a few computers and you can have all of the heat you need and play Half life 2 (or probably 3 by that point) instead.
Technically the issue is the power draw from the graphics cards. This seems to be pushing upwards of 200W per card for high end products; and if you have more than one card in the machine the totals will be higher.
The key issue of course is whether such a monster PSU can be cooled efficiently and quietly enough for the consumer market. You would probably need quite a large fan to cool a 1kw PSU adaquately and that isn’t likely to be quiet.