Vacuum relief valve or not

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by bradah, Apr 24, 2021.

  1. bradah

    bradah New Member

    Joined:
    Jul 8, 2009
    I’m wondering if in my situation I need a vacuum relief valve on my Bradford White Arrowtherm hybrid water heater. I have city water and there is a backflow check valve so that water from the house can’t go back into the main system. Wouldn’t the backflow check valve negate the need of a vacuum check valve?
     
  2. Reach4

    Reach4 Well-Known Member

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    Sep 25, 2013
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    IL
    No relationship.

    Vacuum relief valves are usually for when the WH is not on the lowest floor. I am not a pro.

    The city backflow check valve would be the reason that thermal expansion tanks are needed on tank-type water heaters. You need an expansion tank for your Bradford White AeroTherm hybrid water heater.
     
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  4. WorthFlorida

    WorthFlorida The wife is still training me.

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  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    My city requires one, regardless of where the WH is located to pass an inspection. WH are designed for pressure, not vacuum, and a vacuum can damage one.
     
  6. bradah

    bradah New Member

    Joined:
    Jul 8, 2009
    My water heater is in the basement... I plan to install the TET.

    Thank you for the replies.
     
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