I have a diy torch like that. When I bought my house it had small radiators in so I bought a torch like that to enable me to add some bigger radiators. It had been out in the garage for years and a couple of years ago I re-found it, so I was able to make use of it if I got a job that was too big for my normal torch. The only problem with them is they roar and if you are soldering in a spare bedroom complete with expensive carpet its a bit scary.