outdoor wood furnace - water system


(lots of outdoor wood furnace vendors on the 'net - very little "overview" type information, it seems)
Do all outdoor wood furnaces use an unsealed system for water circulation, or are some of them sealed loops these days?
cheers
Jules
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"Jules" wrote in message

Ask here... http://www.arboristsite.com/forumdisplay.php?fU
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