Really thin metal and metal was dented in several places when I unpacked it. The seams were a little crooked where they welded the metal sides together. I would say you get what you pay for. This was not expensive and I am guessing it will only last 1 maybe 2 years if I am lucky. Just a heads up that the instructions say do not leave out in the rain or snow. What?! I am connecting to natural gas, so I am not moving it! That would require a plumber every time it rains!