Originally Posted by Grey9712
The pressure relief valve was open. No water goes in.
Let me get my head around this. You have a 3 valve system but no water will enter the water heater when the top and bottom valves are open and the middle one is closed. Is that right?
Try it with the top and bottom valves open (handles in line with pipe) and the middle one closed (handle cross wise) and see if you get water out of the hot water taps. It should fill the water heater's tank if you open a hot water tap. Opening the pressure relief will vent air to more quickly fill the tank, but it will fill just fine with a tap open.
Opening the bypass will, well, bypass the water heater. This typically results in cool or luke warm water due to the mixing of hot water coming out of the tank and cold water coming up the bypass tube.
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