I'm in the same boat as some of you; my OWB is keeping up fine but my house isn't cooperating. A north-facing wall comprised of single pane, floor to ceiling windows, a west facing wall of the same construction, one cement block wall and the rest a converted pole barn with absolutely NO insulation, combined with a forced hot air heating system that was too small to begin with just makes it almost impossible to heat. It was holding 68 degrees until the outside temps went below zero and the wind kicked up to a sustained 30 mph speed. Now it's barely holding 63 with an outside temp of -12. But the boiler temp holds 185 degrees and even shuts off on a regular basis. The inside duct work just can't handle any more flow. I'm still getting a 12 hour feeding time with the OWB, altho it's burning slightly more wood. Just got it on-line a week ago, so no time to get used to it or learn any querks it may have. It's only trying to heat about 1300 square feet right now, but it'll be closer to 6000 when I finally get the main house on line, hopefully at the end of this week.