I recently received a post on my blog from a subscriber in the U.K. by the name of Cleland who has installed numerous glycol solar hot water systems. He said he was starting to encounter many of the problems I’ve been describing lately. In particular, he mentioned the following headaches…
Stagnation and boiling of glycol
Corrosion of pop-off valves
Degeneration of the glycol
Failure of expansion tanks
Need to change out the glycol every five years (minimum).
Feel free to read his entire comment and post your own thoughts or questions about glycol systems. Luckily, there’s a much better way to design a solar hot water system as I’ll be illustrating next time.
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