If you are looking at installing a solar thermal collector array, take a good hard look at "steam back" system design. They combine the strengths of other types of systems, and are safe and durable over the long term. The steamback can be over built, containing more collection area than other types of systems. This gives you more productive operation when the sun is out, covering demands overall throughout the years. On especially sunny days with low demand, the panels simply stagnate and the liquid boils out if it can. No harm, no foul, no problems. Slick and simple operation.
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