Kinda neat design. Definitely looks sturdy. Wonder if you could get some secondary burn built into the upper box, but I'm afraid the gasses would be cooled off too much after going through those tubes. My biggest concern with the design is that having that separate box separate from the burn is likely to build a bunch of creosote up in a place where it can't be cleaned and then you'll eventually have it burn off and be a potential hazard.
Discuss.
Discuss.
Also have a great little wood burning stove I built several years ago and no longer need. Stove is freshly sandblasted and ready for paint. The dimensions are 16 1/2-3/4 X 36" high to the top of the fire box, which is designed to mimic a fire-tube boiler. This little guy puts out a huge amount of heat for a small amount fuel !! Fire box {upper 2/3} is made of 3/16 steel plate and will last forever, and retains heat long after wood is gone. Will be painting in the near future, probably within the next week or so it doesn't rust up. Just paid $80 for the sandblasting!
Sandblasted = $325 obo
Painted= $400 obo