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SOLAR, WIND & MICRO-HYDRO SOLUTIONS Solar Water Heaters… Vacuum tubes are the most efficient solar water heater, but until recently have been very expensive. They provide piping hot water on most days where there is a
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SOLAR, WIND & MICRO-HYDRO SOLUTIONS Solar Water Heaters… Vacuum tubes are the most efficient solar water heater, but until recently have been very expensive. They provide piping hot water on most days where there is a