File: Open loop system.gif
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Revision as of 21:30, 28 February 2014 by Rick Swarts (talk | contribs) (This file is in the public domain, being produced by the United States Department of Energy (http://energy.gov/energysaver/articles/geothermal-heat-pumps).)
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This file is in the public domain, being produced by the United States Department of Energy (http://energy.gov/energysaver/articles/geothermal-heat-pumps).
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