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Old 11-13-2018, 09:26 AM   #3
sourdough
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Join Date: Feb 2014
Location: W. Texas
Posts: 17,600
Joe beat me to it. Wrote a detailed reply but my ISP lost it. The check valve/backflow preventer on the hot water out side could be defective allowing water to enter the hwh. I am assuming you have a one valve bypass. If you have 3 it literally blocks the water without depending on the valve.
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