Depends a lot on wood and how you fill it. A normal 12 hour load of dry oak in my conventional typically runs 300-400 depending on the part of the cycle. 430 was the highest I'd seen it ever, until I filled it for 24 hours (double load) to prove a point to a crazy old hippie, which raised it to 480. Wet wood it never comes off the bottom and my gauge goes down to 200. I shoved it full of old magazines last week and saw 720 I believe. Last night shoved it 100% full of really dry, partially punky oak. Like almost 4 wheelbarrows full, 8x a typical load in 30 degree weather just as an experiment to see how long it'd last. I didn't stand there and watch the stack forever, but I never saw it hit 400 in the 15 minutes I was out there. There was a video of the raging blaze on Facebook, d5knapp saw it and can attest. I'd be very interested to see what your BL 2840 runs! They seem to be very efficient stoves and burn very clean in comparison to mine