For soldering wires in places beyond an extension cord, or for burning stuff with fine details I use this butane-fueled micro torch. It is like a propane torch, only 10 times smaller. The micro torch generates a tiny, precise, very hot blue flame. Uses typical butane refill liquid. It’s lightweight and agile. But unlike other self-igniting micro-torch models, including the previously-reviewed Weller Portasol, or the ones used by jewelers, this one is cheap at $12. It is good enough for the occasional heating I do.