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DIY Solar Water Heater! – Solar Thermal COPPER COIL Water Heater! — 2 Comments

  1. No freeze protection, which is the real challenge for solar thermal. In climates where that isn’t needed, such systems become much more feasible and cost-effective, and a variety of even simpler systems proliferate, like the good old-fashioned black-painted metal barrel.

    • We used to have a black painted barrel on the roof in Colorado but the water almost never got nice and warm. Now in the tropics it’s the opposite situation where it’s easy to heat water with the sun. In fact, it’s easy to overheat the water and get scalded with the wrong design.

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