3600sf heated from the basement, with 2x4 walls, and running at 400+. Something just doesn't seem right.
I've got 1,000 sqft less and struggle to heat with 2 stoves! But besides the poor insulation and air leaks, I just have a hard time moving heat around from the great room with 18' ceiling through a doorway to the other side anyhow, so 2 stoves help heat more evenly.
So far I am quite impressed with the IS! As far as stovetop temps, kind of depends where you measure... my last burn I recorded I was over 400 stt for ~13 hours on the hottest part of the stovetop, and I'm still pretty new to learning how to control it. That being said I got enough heat out of it for about double that length, just a bit under 400, but apparently good enough to keep the house nice and toasty.
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