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Thread: supply temp ver: return temp

  1. #1
    DIY Member rrekih's Avatar
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    Default supply temp ver: return temp

    I have a small staple up under floor radiant heating system.
    Right now 8 zone manifold that I am using 5 zones, will be adding 3 more zones in the near future.
    I am running supply temp of 140deg F (it actually runs at 137 / 138deg F)
    The return temp is between 126 and 128deg F, so it runs between 8 to 10deg F cooler.
    Is this a good ratio?

    Thanks for any info.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    If the zones were too large, the return temperature would be much lower and the "end" of the system would be starved of heat. You seem okay, but even if it were not a "good ratio", what could you do about it now?

  3. #3
    DIY Member rrekih's Avatar
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    It is not a finished area at the moment so I could in worst case scenario do a reconfigure.

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    DIY Senior Member zl700's Avatar
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    A tight Delta T on radiant flooring can be a good thing, offering even temps however, tight S & R temps on the boiler depending on piping can lead to reduced efficiencies.

  5. #5
    DIY Member rrekih's Avatar
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    I am using a total modulating tank less hot water heater.

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