Water heater expansion tank pressure question

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On Dec 14, 7:02pm, "Steve Barker DLT"

Correct. 80 psi is much higher than is recommended for residential use. 60 psi (measured at the house) is about the most ever needed unless it is a commercial establishment. Pressures higher than 60 cause excessive strain on fixtures for no percieveable gain.
If a Pressure Reducing Valve is not installed at either the meter or where the water enters the house, one should be installed.
Harry K
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