Solar hot water collectors use copper to collect heat and transfer it to water. They can be flat panels or evacuated tubes as is this one from German manufacturer Viessmann. This photo shows how copper fins, painted a dark color, act as a solar collector. Fluid flows through small pipes within each tube to a heat exchanger.
March 21, 2011 1:50 PM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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