Using water as a greenhouse heat medium

I found this on YouTube.  Another greenhouse using water as the heat energy storage medium.

 

This greenhouse isn’t using geothermal heating, but it provides additional testimony that water makes a better medium than air and, as this man claims in the video, better than rock.

I’m not sure his claims about hydrogen are correct.  Hydro-carbons like oil have a lot more hydrogen than water does but gave lower specific heat than water.  But regardless, good technique!

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