I have a small one that works pretty well,30,000 BTU I think can't remember the make without looking but it's one from Lowes or Home Depot and it works fine but it needs electricity.Then I have another one that's adjustable from 30-80,000 btu that one works without electric and I've used it for a lot of things,including auxillary heat for the house,I put it in the basement and it did a heck of a job but that one has a much bigger flame so you need to be cautious with anything flammable nearby.