Hi All,
I recently completed a dedicated gravity hot water re-circulation loop in my house. As part of the build I had installed a PVC non spring flapper check valve in the line. It was working perfectly. We went from 3-4 minutes hot water at the kitchen sink to less than 10 seconds.
Then after a week or so I found out that I should not be using PVC in potable water lines. So I bought a brass flapper check valve at Home Depot and immediately started having cold water in my hot water line....
Check valve for gravity hot water re-circulation
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