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How many loops on a manifold??

Kungur Member Posts: 49
As I start my retro-fit of my house I have the 2nd. floor tubing and transfer plates in. Insulation tomorrow.

My question is when I do my 1st. floor. I will have 12 loops and would like to know is there a maximum # of loops that can realistically be on one manifold?


  • CMadatMe
    CMadatMe Member Posts: 3,086
    That Is Dependent

    On head loss and whose manifold. For instant a Wirsbo TrueFlow Manifold can handle up to 12 loop configurations.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • Kungur
    Kungur Member Posts: 49
    These are the ones

    I was thinking of using Everhot (part# SSM010) or a Wirsbo TruFlow Jr.
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
    It is limited by....

    The size of the manifold, AND the size of the supply/return lines serving the manifold, which ever is lesser.

    For example, if you are using a 1-1/4" bodied manifold, but are only supplying it with a 3/4" S&R, then your max flow is limited by the S&R lines. If 3/4" can carry 4 GPM, and each branch circuit can carry 1/2 GPM, then the 3/4" lines dictate not more than 8 ports.

    So, as with ALL hydronic questions, the only correct answer is, it depends....

    Have you done a heat loss calc yet? That is what REALLY drives the S&R line size for the area being served. Manifold sizing is secondary to that.

    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • NRT_Rob
    NRT_Rob Member Posts: 1,013
    it's about flow

    not about loops. if you don't know your flow then you're guessing.

    I've done 16+ loop manifolds. but I design low flow systems, so my feeds and the manifold body can take that, no problem.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
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