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Thread: 2 HW Tanks in Parallel, Where to Tap Irrigation Line? Need for Expansion Tanks?

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    DIY Member jluksic's Avatar
    Join Date
    Jul 2005
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    Colorado
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    Default 2 HW Tanks in Parallel, Where to Tap Irrigation Line? Need for Expansion Tanks?

    I have 2 50 gallon HW heaters in Parallel. I have tapped into the cold supply line that feeds the 2 HW heaters between the HW heaters.

    See diagram.

    I have noticed that the cold water line supplying "Tank B" gets very warm over time.

    Questions:

    1. Where is the proper place to tap into the cold water lie to feed my irrigation system? Before, during or after the 2 HW heaters are served?

    2. The "excess" heat generated by my HW heaters seems to "back track" into their respective cold water feeds... will an expansion tank address this issue? If so, where should the tanks be located?

    Thanks.
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