DIY Solar Water Heater! – Solar Thermal COPPER COIL Water Heater! – Easy DIY (Full instr.) 170F

Here is a simple to construct copper coil solar hot water heater. It is like an on-demand water heater, as there is no storage tank, but when the sun is shining, you can get hot water for cleaning. With a little ingenuity, a tank could be added.


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  1. WGP 17 February, 2017, 11:22

    Nice idea. Be sure to paint it all black and cover it with heat trapping tempered glass so it is easily cleaned and less affected by air temperature

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  2. WGP 17 February, 2017, 11:31

    Braided high pressure pop line painted black won’t break or split when frozen during cold nights and winter. Aslo a hell of a lot less expensive than copper. Consider black ABS in a larger box painted black tilted 90 degrees to the suns lowest sky path. Cover with tempered glass to trap heat and keep clean. Don’t forget a drain or other method to keep from freezing with ABS.

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  3. ZebBlanchard 18 February, 2017, 13:56

    Price out the cost of tempered glass and copper vs the amount of heater wood you will save in your outdoor hot water furnace. 🙂

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  4. Attila 24 July, 2017, 10:20

    Use the foil backed insulation board for the bottom of the box, cedar 1×2 for the sides, glued and screwed, flat black spray paint the entire interior as well as the tubing. If you have an attic, get a large hot water heater up there and plumb it so the solar heated water goes in the top and water from the drain goes in the bottom of the solar tubing. The difference in height will allow thermal siphoning. In the deep South, throwing an old blanket over it during freeze warnings will suffice, otherwise drain during the freeze season.

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