I guess you're referring to the Green Mountain stoves? Have either you or @webby3650 had a chance to look inside one? Did they look like substantial construction? Cat well-protected? The 40 looks weak but the 60 looks like it puts out some heat according to the EPA tests..Also look at the hearthstone hybrid stoves.
Seems a lot has been changing in the non-cat stove world. Lower particulate outputs, but webby said he looked inside at the new Heritage 8023 and that they had "cheapened it up." I wonder if they are having to build less mass into them to help them burn cleaner? Just guessing here, I dunno..
I see that the EPA numbers are showing less high-end output on the newer models, for example the Manchester 2 8361 @ 34000 BTU/hr, 2.1 grams/hr particulate compared to the 8360 @ 47500 BTU, 3.1 particulate. And the Heritage 8023 @ 23791 BTU, 2.0 particulate, the older 8022 @ 32800 BTU, 2.7 particulate.
I don't know the ins and outs of the upcoming new, more stringent EPA standards, but it's clear that the lower a stove burns with the air wide open, the lower the gm/hr particulate is going to be. So in 2020, are we going to be stuck with a bunch of low-output secondary-only stoves, with the only way to get higher output being to go hybrid or straight cat?