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Thread: vACUUM RELIEF VALVE ON CLOSED LOOP SYSTEM?

  1. #1

    Default vACUUM RELIEF VALVE ON CLOSED LOOP SYSTEM?

    Hi, Chris here first time poster!

    I am putting a small infloor hydronic system together to heat a small addition. This is to supplement my existing forced air gas system.

    I am considering a Marathon hot water heater as the supply and the marathons come with a factory installed vacuum relief valve. My understanding of the vacuum relief is that it will let air into the system should a vacuum occur. Knowing that air in a hydronic system is not desireable should I remove the vacuum relief?

    Is there any possible way a vacuum could be created in a closed loop system?

    Regards,

    Chris

  2. #2
    Master Plumber nhmaster's Avatar
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    It won't make a difference.

  3. #3

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    Quote Originally Posted by nhmaster View Post
    It won't make a difference.

    You saying leave it, remove it and plug it all the same? I dont want to have the circ pump pull air into the system.

    Chris

  4. #4
    Master Plumber nhmaster's Avatar
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    Just leave it. The system is full and under pressure, the vacuum relief doesn't come into play unless you break a pipe. Why in hell's name are you using a water heater to for space heating? Like throwing money away?

  5. #5

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    Quote Originally Posted by nhmaster View Post
    Just leave it. The system is full and under pressure, the vacuum relief doesn't come into play unless you break a pipe. Why in hell's name are you using a water heater to for space heating? Like throwing money away?
    I have lots of money to throw away!!! Just kidding.

    This is a one room addition that is open to the rest of the house. House is heated by forced air gas.... The hydronic heat in the floor is just a supplement. On the coldest day so far (14F) the room got down to 57F and I have not even insulated the crawl space underneith or blown in the ceiling insulation of r50.
    By my calulations I will only need about 7500 btu's to keep the room nice on the coldest days in my climate (about -13f).

    What else would you recommend?

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