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Below is the layout of my bathroom and my starting point are the red/blue vertical copper pipes you see in the picture. The walls you see will be tiled so not sure how much sense would make to have a manifold somewhere. I will need box behind the shower panel. I am considering running the trunk and lines low near the ground and the dry vent and the drains (green and yellow pipes) at the level of the inflexion point of the shower. I would like to install them up near the ceiling but I don't think that I have enough room behind the two vertical copper pipes (red and blue) to the right of the shower

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  • what program did you draw the bathroom in? Nov 29 '20 at 2:23
  • I used Sketchup
    – MiniMe
    Nov 29 '20 at 2:40
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I home run cold tap water lines 1/2" as close to supply as possible so I can get cold water ground temperature for drinking with the shortest wait possible - assumes your tap water is good quality. Not sure if you'll be drinking the cold water from the bathroom.

I home run hot water lines as close to the hot water tank as possible so again I wait the minimum amount of time to get the water at the tank temperature.

If I was only re-doing this bathroom I might do the last mile here as if it was homerun plumbing up to your take off point and if/when you redo the rest you could update it.

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  • There is a long way to the boiler which sits somewhere to the left of the sink ... two rooms away. The upstairs bathroom is downstream to this bathroom so to speak
    – MiniMe
    Nov 29 '20 at 2:44
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My understanding is that manifolds must be exposed, so can't be buried in a wall, say, like behind wallboard or tile. What I read also specified that you have cutoff valves either at the manifold on each line, or accessible near each termination (point of water use,) and that placement might be determined already by your AHJ - the Code Dept or

Authority Having Jurisdiction.

SOURCE: PlasticPipe.org - check their publications

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    I'm sure that putting the manifold behind an easily removable panel (as is often done on the back side of a shower to grant access to the valve assembly) would be quite acceptable.
    – FreeMan
    Jan 28 at 18:43
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    Very good point, using a panel. I wanted to point out to have it serviceable and accessible, didn't sound that way, you're right. Jan 29 at 3:26

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