A typical OWB install requires zero knowledge or licensing in the mechanical or boiler trade. The install itself is far more important to the system efficiency than the outdoor stove. No zoning, pipes 3-4 times too small, wrong pump sizes, wrong size heat exchangers. Its safe to say half are VERY wrong. When someone can easily Repipe and redesign the system and cut wood use in half, well says a lot about the typical 1 giant loop brochure design. And trying to shove 10-20 GPM thru 3/4" underground lines. Ever wonder why boilers always have big pipe? Cheap cheap cheap and purchases without good research are an OWB salesman dream customer. Its a shame we read so many horror stories that could've been easily prevented with just a little education and understanding. Those OWB's should be rated by cord use per lifespan. We have farms and greenhouses that don't burn 22 cords. It must be 6000 sqft of snow melt for. 22 cord