Pex Design Question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rocknroj, Apr 21, 2009.

  1. Rocknroj

    Rocknroj New Member

    Dec 30, 2008
    I am replacing my system with wirsbo. I have an open jolst bay that services 2 showers, laundry, and 1 lav. It is located about 12 feet from the water heater. I am planning on using a manifold with 1" inlet and 1/2 lines through the joist bay for each cold supply. From the manifold, the trunk line continues another 5 feet to another joist bay serving 2 toilets, 1 lav, 1 hose bib. Here I would place another manifold for the cold. I was going to do same for hot, except without the second manifold (not needed). In researching, it seems it may be better to place a manifold closer to the hot water heater and run the 1/2 lines the extra 12 feet rather than fill the 1" line each time I need hot water. Perhaps I answered my own question and am looking for some experienced confirmation.

    So my question restated.. Should I make long runs of 1/2 for the hot or run them off a manifold closer to their destination? It seems that this would give me quicker hot water when first used.

    Thanks in advance..
  2. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    I doubt you will notice much difference, but smaller lines will get the water there faster.
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