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Thread: How can i tell supply from return?

  1. #1
    DIY Junior Member marklamberti's Avatar
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    May 2013
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    Default How can i tell supply from return?

    I am replacing a small radiator in my kitchen with a kickspace heater.

    I have a 4 zone boiler with individual pex runs to each raidator, what i cant figure out is if there is a way to tell which pex line is the supply/return.

    Is the bleeder on the radiator always on one side? is there a simple way to figure this out?

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Default

    If you can't trace the lines out turn the heat on from a cold start. Holding both lines the one that gets hot first is the feed. Can't see what difference it would make on a toe kick heater.

    John

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