Not Ranked
Mando - my understanding is that it doesn't really matter where in the heater supply line or return line it is that the valve is located. When the valve is off, it just stops the flow, and there has to be 'dead' water sitting in the line before and after the valve. The important thing is that there can't be air anywhere in the system.
Can you add to that Tim?
Cheers,
Glen
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