I bought this exact same burner from Northern Tool about five years ago. I use mine at a group picnic. With a large pan of water on top it keeps a Calderon of beans hot all day. It is a high output burner. Even just using the smaller inner ring it will keep five gallons of beans piping hot. I think it would be too powerful for a smoker. I even have to put a heat shield under it to protect the picnic table.There are quite a few here that use this model from Northern Tool. Has three flame rings and three controls so you get a wide range of output if you need something other than full blast. I'm sure Pops and some of the others will offer their opinion of this model in the thread shortly.
http://www.northerntool.com/shop/tools/product_15490_15490