We are now starting to get reports on the 2020 stoves, and it seems that the ones that are limiting how low you can cut the air in order to meet the regs, might be harder to control. Heck, I got my SIL a 2019 stove, and it wants to go high with only 15' of stack and a flue damper. I recently installed a second damper and it appears to cut the burn back a little bit.There's been a bit of discussion lately (maybe always) about how installers never measure draft even in situations that are likely to have too much. You may need a flue damper (some use two) to reduce your draft.
I mean, I can get an under-control burn, but I'm a stove nerd. My SIL is slower to pick up on the subtleties, even with me coaching her. Joe Blow average stove buyer has no clue what's going on and unless they come here, or have a good dealer backing them, will remain in the dark. Stove damage or worse may be the result. Those good dealers appear to be rather few and far between.
I'm about to find out what happens with a larger load in cold weather with stronger draft; Mid-teen lows are on the way for a few days.
I'll then find out whether I need to take measures. I think I will either way, so my SIL can cut the legs out from under the burn if she mis-calculates when starting a larger load. She's just been burning short loads but that's not gonna work when winter finally gets here.
As it stands now, she had a lot easier time running her previous cat stove.