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From BrewWiki
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A HERMS, or Heat Exchanging Reciculating Mash System, is a brewing system designed to maintain or adjust the temperature of the mash. This is done by pumping the mash liquid from the bottom of the mash tun, through a heat exchanger, and back to the tun again.
[[Image:Herms1herms1.jpgJPG|left|thumb]] [[Category:Equipment]]
