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We have an evacuated tube system that was professionally installed in 2008. I believe we were the company's first evacuated tube customers, possibly their first solar customers! Not good. We recently moved, brought the system with us, and are designing how the system will be set up at our new home.
After seeing the plumbing diagram of how it was plumbed before, a friend brought up an interesting point/possible plumbing error.
Our storage tank has two coils. The glycol from the collectors flows into the tank through the first coil, exists the tank, goes back into the tank through coil #2, exits the tank and goes back to the collectors. Our domestic water is the water inside of the tank (not in a coil), cold into the bottom, hot out of the top of the tank.
Is this setup ok or is another layer of protection required between the glycol and domestic water?