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Thread: Monoflow vs. Strait loop

  1. #1
    DIY Junior Member Peter57's Avatar
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    Default Monoflow vs. Strait loop

    Hi all:
    I'm replacing a 60 year old copper/monoflow system with PEX, and am considering a strait through loop. I could use some advice.

    The heating is for the first floor, 1 zone, about 750 sq. ft. I plan to branch off from a common 1 inch PEX feed into two 3/4 inch loops of approx. same size. The baseboard is Hi output slantfin (80) with 3/4 inch copper. Strait thru is so much simpler than monoflow, but are their disadvantages with strait thru? Why was monoflow even used in the first place? Am I doing the right thing??

    Also, do I need bleeders in a strait thru loop? (I will put shutoff valves in each zone)

    Regards, Peter
    Last edited by Peter57; 11-27-2011 at 05:38 PM. Reason: added last question on bleeders

  2. #2
    DIY Senior Member BobL43's Avatar
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    Default

    With monoflow Tees, you can shut off each baseboard radiator without shutting off the flow for the entire loop. If you have no need to be able to shut off individual radiators in the loop, I don't know if you'd need those tees. I never worked with PEX, but I've read that the effective sizes are different than those of copper because of the wall thickness, so you'd need to go up a size to get the same flow rating.
    I am definitely not a pro plumber, but I am a pro crastinator

  3. #3
    In the Trades Tom Sawyer's Avatar
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    Go with loop piping, there is way less pump head loss. I would bring each loop back to the boiler manifold rather than split 1" pex.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  4. #4
    Moderator & Master Plumber hj's Avatar
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    quote; Go with loop piping, there is way less pump head loss

    I doubt that that is true because a Mono-Flo system uses a larger main "loop" which creates LESS flow restriction.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member Peter57's Avatar
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    Default

    Thanx. I don't really need to shut off each baseboard. I've resched the PEX wall thickness and you're right, it is a bit smaller.

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