No, at 12 hours, It is still hot, not 650 degrees hot, but plenty hot, warm air blowing out the top, as I run the fans on high 24/7 except for cold starts, re-loading & during shoulder season, and of course during power outages. 12hours or more depending on wood species, size of splits etc, will be either remnants of splits, or plenty of coals. During shoulder season, I can extend another 4 hours sometimes more. I know some don't agree, but outside temps & wind play a factor. But 12 hours is my typical routine.Yep, the higher you set the thermostat, the more the burning experience is similar between a cat and noncat. I'm with you on that. The cat stove is still more efficient at all burn rates but if all you ever want to do is run the stove balls to the wall then you might as well have a non-cat.That's why my shop stove is a non-cat. Full output all the time! A little clarification though, after 12 hours your summit is nearly cold right? I know that I can burn up 3.5 CF of firewood in 3 hours in my non-cat, best case is overnight with a few coals left to restart.
The pleasure of the BK is that it can put out heat and flames like a noncat OR can be turned way back to idle along when you don't need eye blistering heat. Wide output range with resulting wide burn time range. The ashfords have almost entirely fixed the dark glass feature that I have with my older princess.
I reload, and start cranking it down after about 15 mins. Again this is with hard species. If I am burning pine etc, then of course the times is reduced.