I have also heard of the Defiance Volcano. I am from central Illinois and a friend of mine just put in a Central Boiler to heat his house and their hog farm. In his basement he had a volcano that was actually a boiler. It had about 20ft. of copper coil in the top of the stove that they ran to their propane boiler which then transferred it to their radiant baseboard heat. I actually posted on here previously because I was going to try and modify the stove to use for my radiant in-floor pex tubing for my shed. I am still looking for advice on this, but before everyone said that it was to dangerous being a pressurized vessel. Any thoughts? Any more information on manuals?