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That's the one. I've never used it but the spiel on the back of the box is pretty much in line with my experience. I did increase my public liability to include working with heat as I could see a potential for a sash box catching fire if I was having a bad day!
It will slowly burn the backs of your hands, after a day of using it I feel like I've got sunburn. You'll need some decent scrapers too, the Speedheater (swedish not american) ones are good but a simple flat blade carbide scraper and a profile set would set you back £30 and they would be handy for a lifetime of jobs.
http://www.ebay.co.uk/itm/Electric-Infrared-Paint-Stripper-/121991745668?hash=item1c67465084:g:zn8AAOxyoA1RSc7T
Like this?