We are replacing all the mechanical systems, and pex seems attractive because it's easier to install and cheaper.... and hopefully less prone to freezing and bursting. However, I'm concerned about the "gasoline smell" and chemical leaching associated with pex - and there's only one detailed study about it I can find! See link here: http://wheltongroup.org/wp-content/uploads/2015/08/IN-RuralWaterConfLunchPres-Aug2015.pdf
Would love to hear about people's experiences with pex.
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