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Radiant Heating Expansion Tanks

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J Van Lund
J Van Lund Member Posts: 19
in THE MAIN WALL
What is the difference between the AMTROL/EXTROL EX-15 and RX-15 expansion tanks? What is the life expectancy of the rubber bladder assuming 6 months operation a year, 120F max water temp, and 15 psi max pressure?

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  • SWEI
    SWEI Member Posts: 7,348
    The RX series have a polymer lining on the inside of the metal shell, which allows them to be used in non-barrier systems without fear of rusting. They're also a good idea on systems which are otherwise composed of nonferrous components.

    Bladder life depends a lot on water quality, but should not differ between the two designs. I would expect either to last at least five years in a properly set up and maintained system, but they do need to be tested at least semi-regularly.

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