(Continued from Part 1. This concludes the article.) BUILDING THE BOX Again, if money isn’t a big concern, I’d recommend using a full sheet of plywood and corrugated polycarbonate greenhouse panels. This will not only give you a larger water heater, but be lighter and easier to move as well. I constructed a double-coiled version using a free recycled, double-paned sliding patio door which, on sunny days, supplies more hot water than I can use. The construction method will be the same regardless of which size you choose to make. For the full-sheet-of-plywood version, use two treated 2 x 4 …
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