I know you've experimented and thought this through but I have to ask:
Do they actually 'reverse' or do both lines go hot?
Both lines hot I can diagram out.
Reverse I can't.
A little more information please.
Is the hot the same temperature on house and city water?
Is the cold the same temp on house and city water?
What's the shore pressure?
Whats the pump pressure (just a guess is OK.)
What happens when you're on shore water AND have your pump on?
Does your shore hookup fill the house tank or is it gravity fill?
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