| http://www.w3.org/ns/prov#value | - ng to go on top of it is a simple vertical tube water jacket type with turbulator that also acts a cleaner/scraper for the heat exchange surface.....not as efficiant as a multipass type but it allows the exhaust gas to retain some heat, which is sort of important when the coal your running is 1.5-2% sulfur....any flue gas that condenses causes corrosion damage real quick.....an insulated chimney s
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