Free shipping for orders over $99 Learn more

    Add to wishlist
    compact expansion tank
    compact expansion tank

    Therm-X-Trol Mini Compact Expansion Tank for Tankless Water Heaters

    $48.95

    • Prevents hot water from back flowing into the cold water line, or escape through the pressure relief valve
    • Compact size (about 4″ diameter)
    • For use with tankless water heaters
    • Also use with water heaters up to 2 gallons
    • 1/2″ MNPT (MIP) inlet connection
    • Lead free, UPC approved

    8 in stock

    SKU: AM-ST1 Categories: , ,

    About This Product

    The Therm-X-Trol ST-1 absorbs thermal expansion and water hammer in tankless and point-of-use water heaters to protect the heat exchanger. Simple to install, the ST-1 features a patented air cell and requires no precharge adjustment or maintenance. With a 304SS waterway and a 7-Year limited warranty, the ST-1 has big protection in a compact size.

    Highlights

    • Eliminates the waste of energy and water, thus saving money
    • Protects the water heater and plumbing fixtures from premature failure
    • Prevents a dangerous pressure build-up in the system
    • Prevents the relief valve from going off
    • Connection: 1/2 in. MNPT
    • Proprietary, sealed design never requires charging
    • For use with tankless water heaters and point of use water heaters up to 2 Gal.
    • Superior water hammer capacity
    • Therm-X-Trol brand is the #1 choice of professional installers
    • Professional plumber should check the complete system, including the Therm-X-Trol, yearly and more frequently as the system ages
    Approvals

    UPC

    Brand

    Connection

    Size

    Compact