I found this advertised on craigslist, seemed to be just what I need to keep the shop warm this winter. From what i can decipher it is a 1979 model. The specs are available online and the state this to be a 120k-160k BTU unit. Plans are to install it in the basement and run ducting through the floor. The shop is approximately 1800 SF with insulation in the walls, ceiling and poured walls for the basement. Had to do a little bit of welding, bought $12 worth of high temp paint and a whole lot of elbow grease.