well its taken me 3 months to figure the thing out, but as far as forced wood furnaces go, im happy with it. as stated get the HW coil it works great. It looks like ill end up heating approx 2000 sq ft on about six maybe seven cords. A little more than I was hoping for but acceptable. if you get one pay close attention to the installation instructions, especially the cold air return locations, and duct work sizes. It was zero last night and I got a good 7 hr burn and kept the house at 70. Mines located in my gagage and ducted downhill into the main ductwork. Probably not the best way to do it but no other choice