This is my first time posting. My dad use to build these stoves in NW Minnesota. I remember seeing the steel plant stacked with these stoves when I was a kid. He also built a bigger double barrel stove they called the "Pribbs 48" that kicked out the heat like you woudn't believe. I don't know much about the design or BTU out put, but I think I can find some literature on it. Asked my dad and he said he could build one in his sleep. When he stopped production he loaded up a semi and a guy in northern Canada bought them all. My dad kept a few for his own use. I know we still have a bunch of wood nobs for the handles.