Looking at a Jotul 602. I found a used one locally, but am not sure what I should look for, or if I should go with a new one. Owner says it's the "original" model 602, FWIW, and does not have a glass door. I tried searching, but couldn't find an answer on: 1) Can I replace the door with a glass one? If so, where to buy it? 2) How can I tell if this is an EPA stove? Seems like these have been around for a while--I'd like one with a secondary burn. Do I just look for burn tubes in the firebox? Other distinguishing features? 3) Anything else that separates older/newer versions of the stove?