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I installed a working indoor wood fired boiler. The EPA rules when I purchased and installed the boiler excluded wood boilers and cookstoves. But this wood boiler has European clean air certification and was sold by Buderas as well as the Polish stove supplier. Don't worry about my insurance or city inspections they are done and passed as a regular wood stove and a heating appliance. I supplied the heating system diagrams and installation instructions to the city when they asked.
It is a primary/secondary piping system with two pumps. It took me some time to reason out the piping and controls which are manual not automatic. The stove operates safely with correct pressure release and it works very well now. The biggest hurdle was the pressure release. The stove called for a European type cistern overflow. I am an amateur so most would caution against a DIY system design and installation but I'm a decent researcher and learner. I had a problem figuring out how to get fresh water into the cistern in my setup. The stove is designed to stay below atmospheric pressure internally thus the cistern pressure release; the solution was a pressure release valve at atmospheric pressure and a regular fresh water supply valve. Actually although I got a lot of guff, the folks at Hearth.com helped me figure this one out.
I also tried installing just one pump and having a storage tank for the heated water. I switched to primary secondary for safety. There is a three way valve that introduces water from the return side if the primary loop gets too hot. There is an aqua stat that turns on the second pump when the water reaches 90 degrees. When work was being done in the utility room I removed the storage tank and the system seemed to work better directly to the heat exchange plate. It is a very efficient house and a wood fire is mostly for ambiance. But it is also emergency backup for the gas boiler. The wood boiler is rated to provide approximately 27000 btu with ideal wood.
This was not an inexpensive system. I spent about $3500 dollars setting it up even reusing copper and left over high heat pex from my other systems. Not to mention my time in design and re-design. We don't need much heat in the house so on a cold evening a fire in the stove will delay the mod/con triangle tube challenger boiler firing until morning. I'm not advocating this system for anyone else. It's Just something different for your entertainment. http://blog.twinsprings.com/category/house-systems/radiant/fireplace-boiler/
Equipment: Triangle Tube Challenger C-85, Honeywell Zone Valves (old type), Taco ZVC404-EXP Zone Controller, Taco 009 primary and 011 secondary single speed pumps, one zone baseboard, four zones radiant.