Our passive greenhouse solar water heater

It can't get much simpler: An old window framed with old 2 x 4s, an old piece of OSB for the backing, 20' of 3/8 cooper, 3/8 and 1/2″ plastic tubing, a piece of garden hose and a couple of 1/2″ plastic barbs reducing to 3/8″.  Black spray paint for the OSB and copper and …

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