Over 100 views and only two replies, guess this one's a bit of a rarity. The little information I've unearthed indicated this is a Haas and Sohn Pluto model, and grates and other parts are available from stovepartsplus.com, although this one needs nothing. Lonnnnng burn times are possible on this one by turning the control to its lowest setting... owner would literally load it up on Friday evening, turn the control down and leave for the weekend and find it still burning Sunday evening upon his return, 48 hours later.
Unfortunately I must pass on this... the cost of installing a chimney to vent it is well beyond my price range. If anyone else is interested though, I can direct you to the Craigslist listing here in Connecticut.