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Old 09-05-17, 05:37 AM   #7
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The UK company is still in business but people in North America don't seem to know how to use the highly efficient tubes very well and maintain them. The failure rate of tubes especially the Thermomax/Solarmax/Viessmann is quite high when you have a high solar fraction, ie: try to get more 50% of your annual load supplied by them.

The summer temps just get too high and it is hard on seals and other components. This is why I stay with flat panels. For you, it is different as they are free so i would say to go for it but make sure you can extract that heat in the summer for any longevity.
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