How can i tell supply from return?

Discussion in 'Boiler Forum' started by marklamberti, Jun 6, 2013.

  1. marklamberti

    marklamberti New Member

    May 24, 2013
    staten island
    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. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Aug 9, 2009
    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.

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