I had been following the manual word for word as well including loading left to right, not getting wood near the cat (which is very difficult to not do with the 20), keeping it on high for as long as the manual stated which is longer than necessary (and which would burn up the wood so I couldn't achieve longer burn times). When the dealer was here checking it out he stuffed wood in the easy way - front to back and packed as much as would fit. I do that now and I just let it burn until cat is engaged, then maybe 5-10 min on high before turning down the stat. Have also found that turning it down in smaller increments for ~10 minutes at a time works better. Wood changes the burns each time, but these stoves really seem to fall into the category of fussy and finicky. What is the longest burn time you have gotten?I'm new to this. Sorry to confuse. When you burn on high it gets hot. My house up to 80 85! Getting off topic now tho