stoker-man wrote:We used our unit for only one season and that's what it took (9 tons). I can't add anything to that.
That is very impressive for a building of that size. Did you heat it at all on the weekends? If you ran it from mid November to mid May and assumed 13,500 btus per lb of anthracite...that is an average input of about 56,000 btus per hour over the entire season. As a means of comparison, the math on my 3,500 sq. ft home works out to ~41,000 btus per hour over the same period. Naturally we keep it a lot warmer than your warehouse, and don't turn it down on weekends.
Getting back to the original post, it sure sounds like a draft control is worth a try.