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  1. #1
    Join Date
    Jun 2007
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    No oxygen barrier in radiant floor heat

    I installed a radiant fl heat,350ft of pex (no oxygen barrier) ,ran it off gas hot water heater.5 Years later I'm installing a gas hot water boiler for BBHW, taking out hot air.The question is will I have a problem with rust in the new boiler when I connect the low temp radiant heat .I should of used a oxygen barrier but nothing to saying except I was DUMB.The new boiler will be gas,hot water ,150 temp ,3 or 4 zones,mixing valve,pex(with oxygen barrier) and copper.I thought I posted this already but can't find it so I'm doing it again.

  2. #2
    Join Date
    Nov 2004
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    If you're concerned about this existing loop buggering up the new boiler, isolate it from the rest of the system with a plate type heat exchanger.
    Ed J

  3. #3
    Join Date
    Apr 2007
    Rossland, B.C.
    Post Likes
    Yes .isolate te rad. loop it will mess up the system if you dont. it will need separate boiler feed, expansion tank, and rust proof pump.

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