Haven't ever had to rely solely on wood for heat. As of right now, I'm almost completely off oil and on GSHPs. The two story portion of my house is running on the GSHPs and the single story portion is still on oil for now. Well, the oil ran out two days ago, so I figured I'd just cut off all heat since the GSHPs have too much surge for the electric generator. Figure I need to know what my capacity is in the event of power outage, which are somewhat frequent in my town. What I've noticed is that the single story, which has historically been pretty easy to keep at 68-72 degrees with the Alterra even at single digit temps, can't get above 64. Nothing new with fuel source per se. Only feeding it kiln dried. The two story is warm...very warm. The main room with the insert is large and at 79. Connecting rooms are at 71 and coolest room upstairs is 68. That's burning less than ideal wood with a few small chunks of untreated lumber on reload I can partition between the two inserts and it has no impact. Note, the partition is not air tight nor insulated. The only other variable is the oil boiler is in the basement below the Alterra...I've measured the temp in the room it's in before it wasn't running (54) and after it was offline (51). Actually, the bulk of the heating copper is below the two story. (50) Those temps are likely pretty accurate since my heat pump water heater beeps if it gets below 50 in that room. There are also roxul acoustical panels under the floor in the mechanical room so I'm not sure it was contributing much. Well, I think they're roxul panels, but I inherited them with home purchase in 2011. I'm pleased at the performance of the main living space insert (hybrid fyre), but a bit surprised that the Alterra isn't giving what it once gave. Thoughts on this are appreciated. I know there are folks on here running multiple stoves/inserts and was curious to hear thoughts on the matter. Only thing I can think of is the Alterra is good at maintaining temps, but not so good at raising the temps of a cool home. The temp was 51 when I discovered the oil had run out. Got up to 63 in about two hours. Two days of 24/7 running should be enough I would think if it was capable.