It is nice to see some cold weather to watch the boiler do it's thing. I've been sitting on the end of my seat since I put this thing in this fall. The cold weather showed up just before New Years. The first real test was New Years Eve. Filled the boiler at 5pm as we left for the night.Outdoor temps were -12* C (10*F),winds were NNW at 40KPH( 25 MPH). I returned New Years Day at 8 am to find the house still at 20*C (70*F) with a nice pile of coals left in the fire box. I was impressed with that, 15 hrs of heat and didn't burn out I 3/4 filled it last night, at about 6pm. There was no wind so I didn't bother to top it up when I went to bed. I stayed in bed a little longer than planned this am. Went to the garage at 720am to find the boiler down to 156*F, opened the door to find the load had bridged. There were a nice bit of coals, so I stirred them around and threw in about half a load of splits. I just looked out and it has come from 156* to 173* in exactly 1 hr. So far I'd have to say I'm happy with the cold weather performance.