I drank the koolaide a bit when it came to people with older stoves like fishers & all nighters claiming that they get more heat out of the old stock vs the newer cleaner stoves of today. In the back of my mind there was that small part of me that wanted to believe they were right, and indeed somehow the epa regs w/ todays stove design (circa 2012 and newer) somehow concentrated emissions over usable heat.
Fast forward to this heating season, made good friends with a new guy on our fire dept, been over to his house a bunch of times, he has a all nighter big moe, the stove is a beast compared to my BK princess pound of pound, and we def had a cold winter here, I've only burnt about 2 1/4 cords of wood so far, my buddy on the other hand is at least 4 cords in and ran out of wood, his house was warm, but man did he have to fill the beast, I'm sure if I ran my stove on its highest setting 24/7, I still couldnt keep up with his wood consumption, and thats possibly the difference here, we are maxed or capped on our top end due to how the air intakes are worked, were as his intakes are simple draft caps w/ a tiny door seal that doesnt really do much for air tightness in my opinion, so his top end would be much higher then mine, hence the thicker steel his stove is made out of to handle the higher temps.