Those produce very hot air (600C - think of a hair dryer on steroids!) which burns the top of the weeds off. It won't kill the roots and is generally only of use on gravel driveways etc which are infested by small annual weeds as it will also kill the seeds. No use on weeds in borders, perennial weeds such as dandelion or close to wanted plants, as they will get fried too.
A trowel in the hand is worth a thousand lost under a bush.
I have a gas one which I would assume is pretty much the same, yes they are designed for gravel or paving, they have the same effect on perennial weeds as a hoe will. it kills the leaves but doesn't do anything else so it will take a lot of goes to kill a dandelion or bindweed.
Another use for them is stale seedbedding, you prepare your seedbed for carrots or other slow germinating crops sow the seeds, then wait 3-5 days and run the flame weeder over the bed killing all the newly germinated weeds but not the carrots that have not appeared yet. This is why I have mine.
I have one. It was around £25 from Amazon. I would not pay more than that for one.
I use it regularly. Not for your normal weeding as it would take forever. I use it on weeds that are hard to get at (up the side of walls,block paving, gravel etc...)
It is not an essential part of gardening kit, however it does come in rather useful for the above. It it also quite satisfying when you hear the weeds crackling under the heat.
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By reading what Bob has said I don't think it would work for her.but I would be interested in anyone's opinion who has used them.
I also burnt out 30 conifer stumps with one. Not a recommended use, but amazingly effective with a bit of practice.
If you want to clear a large area, there are more effective methods, but for spot weeding, paving etc worth having one.
I use it regularly. Not for your normal weeding as it would take forever. I use it on weeds that are hard to get at (up the side of walls,block paving, gravel etc...)
It is not an essential part of gardening kit, however it does come in rather useful for the above. It it also quite satisfying when you hear the weeds crackling under the heat.