supply temp ver: return temp

Discussion in 'HVAC Heating & Cooling' started by rrekih, Apr 9, 2010.

  1. rrekih

    rrekih New Member

    Messages:
    46
    Location:
    Canada
    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. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,279
    Location:
    Cave Creek, Arizona
    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. rrekih

    rrekih New Member

    Messages:
    46
    Location:
    Canada
    It is not a finished area at the moment so I could in worst case scenario do a reconfigure.
  4. zl700

    zl700 DIY Senior Member

    Messages:
    237
    Location:
    Texas
    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. rrekih

    rrekih New Member

    Messages:
    46
    Location:
    Canada
    I am using a total modulating tank less hot water heater.
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