The Kuma model we purchased has the air flow in front of the glass, and as long as the wood does not touch the glass, it stays somewhat clean.
We started with a Lowe's special, the small Franklin style stove for $150 or so. Very scary to use! Not UL listed either. Just a cruddy, cheaply made wood stove.
Our second was the Jotul "Nordic" model listed at 35,000 BTU for up to 1,000 sq.ft.. I found that # to be VERY optimistic. That was a $1,000 mistake.
Our third, and current stove is the Kuma "Tamarack" model, listed for up to 1,700 sq ft. It was $800 new, and delivered !
Fortunately they had NO idea what they were getting in to!
We love this stove, and it heats our cabin very nicely.
BK, wanna buy a Jotul woodstove?