I use a primus blowtorch it takes those orange gas tanks you can get them from any good plumbers merchant, it is self igniting and has a swirl jet nozzle, it cost about £ 50 however the gas refills are really cheap . If you are using it to heat stubborn bolts you use quite a bit of gas so don't be tempted by cheap guns they will break down and the gas cartridges are the real cost.
The primus one is used by plumbers so is commercial grade and is very controllable.
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