I've searched all I could. Just can't seem to find the specs on this unit. BTU, heating capacity, burn times on wood and coal. I can't find any info but I know there's got to be someone out there who knows all this info. It's a biggen, just by looking at it, looks like it can heat the state of Alaska. Gold Marc Industries Monticello, date tested 5/8/80, wood/coal, label serialno. 113, test standard UL 1482. Tested by Arnold Greene Testing Laboratories in Natick, MA.