Originally Posted by cci
I belive start simple first. Any chane your hot water bypass has been has been turned by accident. Both getting pressure from same place so could also be a kinked or blocked line. Would have to be right after water heater or not all faucets would trickle at same time.
I believe that if the bypass valve were open, the pressure and flow would be identical; just the cold water would mix with the hot and the result would be plenty of luke warm water.
Several issues of luke warm water solved by closing that valve.
It could also be a rare (but not unique) 2 valve system where there is a check valve at the hot water outlet AND a bypass valve. In that case the check valve should be replaced.
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