Eere_active_closed_loop_simple.gif(316 × 295 pixels, file size: 11 KB, MIME type: image/gif)

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current23:36, 2 August 2007Thumbnail for version as of 23:36, 2 August 2007316 × 295 (11 KB)Climbingsurfer (talk | contribs)This picture provided as public domain at [http://www.eere.energy.gov/consumer/your_home/water_heating/index.cfm/mytopic=12850?print] by the US Dept. of Energy

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