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I took an old electric water heater and old chest freezer and made a solar water preheater . The tank is good so I mounted it horizontally in the freezer, covered it with a sheet of lexan after removing the freezer lid, and ran the cold water in to it and the preheated water from it into my regular gas water heater. This has saved me at least $15.00 a month on the gas bill and works great for a very small investment. It still works after 10 years with minimum maintenance.
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