Re: High efficiency wood-furnaces?

Posted by jdemaris on February 28, 2005 at 06:49:59 from (209.23.30.13):

In Reply to: Re: High efficiency wood-furnaces? posted by BLW on February 28, 2005 at 06:31:09:

I built one years ago that was similar. I too used the bi-metal spring off an Ashley, but you can buy them separate in many places now. I worked for Thermo-Control stoves that used the same principle. I used a 25' chimney made from 7" well casing, and put 10" chimney pipe over it, and then filled it will insulation. This kept the pipe hotter and cleaner in low-fire situations. It had a pretty high expansion/contraction rate. I built the furnace from 1/4" and 3/8" steel plate and insulated the interior with firebrick. I also built a recirculative flue-gas reburner in it with a diverter damper that I could open during low fire or starting situations. It worked well, but was still not efficient during low-fire. Using a bi-metal spring to control intake air allows the fire temp to get too low where it gets inefficient. That is the entire principle behind all the "air-tight" stoves that were popular during the 70s, and are now, more-or-less, illegal to sell new in the U.S.

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