At one time, with my VELUX skylight business, VELUX manufactured solar powered water heaters. Profit was fair and payback was reasonable. Plus, there were and are some state and Federal solar tax credits which made solar water heaters practical. The solar panels were installed just like our skylights, thus when the roof was replaced, the panels remained in place like a skylight and a new roof only required a new inexpensive flashing. VELUX ended up selling their system to another solar company as they knew once the tax credits would expire, it would be financially unfeasible to recoup the investment without tax credits. I quit selling them and only sold solar powered skylights that had a better payback for the homeowner. Thus, if it sounds to be too good to be true, it usually is.
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