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<updated>2026-07-21T08:16:22+00:00</updated>
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<title>Vacuum tubes solar water heater working</title>
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<summary type="html"><![CDATA[The basic pipe is a coaxial arrangement with a glass outer tube and a closed copper inner tube that holds a nontoxic fluid. The inner tube has low pressure in it so that the small amount of fluid vaporizes at a lower than normal temperature.]]></summary>
<updated>2021-06-30T06:55:35+00:00</updated>
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