The cheap weed burners are just a length of metal tubing shaped like a “J” with a fitting for a 1-pound propane tank and a handle. Typically sold as a “weed burner/ice melter” combination, the manufacturers don’t mention these units’ BTU rating for a reason: they’re not powerful enough to do any serious weeding with. They also rip through those little disposable propane tanks like a hot knife through butter, which isn’t a good use of your money.
To really do any serious weeding, you need a weed torch rated at a minimum of 100,000 BTU. The leading brand for these units is
Weed Dragon, but users report that the generic knock-offs work reasonably well. If you buy an
off brand of weed torch, inspect it carefully, because equipment failure around propane and fire can have tragic consequences. If you’re buying online, you’re better off sticking to the name brand, which is priced reasonably and available through a variety of online stores.