Actually, they were connected one way or the other by my builders plummers.
I don't know which way they installed. I'd like to take the heater out of
the attic and remover the additional lines there (inlet and outlet) However,
I'm not sure all will be well. For the moment I have it switched off and the
heater in the garage provides enough water for the house. What would the
repective diagrams look like? How would I know if they are parallel or
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