It consumes energy, it smells so you need to keep a window open, and it's suitable for a small space, smaller than a regular room.

The tool is excellent. If you use it in a very small space, you need to be careful because even at its lowest setting it produces a lot of heat. It can turn a tent, even a large one, into an oven in just a few minutes. It can easily heat up a small room, for example, those used by security guards, kiosk owners, or military sentry posts. Also, if a large vehicle is not moving, it can easily heat the driver's cabin (definitely only when stationary, otherwise on bumps it produces a dangerous flame). If you use it at full power, it can even heat a student dorm room or a small studio apartment. Outdoors, it can somewhat help some coastal fishermen if they have it close by. The consumption is the same as that of a small gas canister used for making Greek coffee. It loses one star only because the base where you attach the gas canister does not fit modern bottles, but this can be easily fixed with a little improvisation or even without it, since the canister doesn't fall off even without the base. Be very careful not to have it near flammable materials as it produces very high temperatures 40-50 centimeters away from the burner.