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Five votes. I converted a Roundhouse Billy to alcohol firing a couple of years ago. I used the stock boiler and added a firebox to the back end to make a "C-type" boiler. I used two 1/2" dia. wicks, and I added baffling to the single flue to slow down exhaust gas flow. Most of the hard work was in the smokebox to make it air tight and to figure out the blast pipe arrangement.

Steve
 
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