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Expansion Tanks

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An expansion tank is a required component for all hot water boiler systems (not used for steam boilers). It controls system pressures and reduces energy consumption.

Not sure what size expansion tank is right for you? Let our easy to use Expansion Tank Selection Tool help you find the right tank for your hot water boiler system!

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Amtrol EXTROL 15
2 Gallon Bladder-Type Expansion Tank


$ 46.99
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    Product Image
    Amtrol EXTROL 30
    4.4 Gallon Bladder-Type Expansion Tank


    $ 53.99
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    Amtrol EXTROL 60
    7.6 Gallon Bladder-Type Expansion Tank


    $ 133.99
    Product includes:
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    fill-trol tank
    Amtrol FILL-TROL 109
    2 Gallon Bladder-Type Expansion Tank with Fill-Trol® Automatic Pressure Reducing Valve


    $ 83.99
    Product includes:
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    fill-trol tank
    Amtrol FILL-TROL 110 popular
    4.4 Gallon Bladder-Type Expansion Tank with Fill-Trol® Automatic Pressure Reducing Valve


    $ 88.99
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    Amtrol ST-5 Front
    Amtrol THERM-X-TROL ST-12 popular
    4.4 Gallon Bladder-Type Expansion Tank for Potable Hot Water Systems


    $ 66.99
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  • Premium Guarantee
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    Amtrol ST-5 Front
    Amtrol THERM-X-TROL ST-5 popular
    2 Gallon Bladder-Type Expansion Tank for Potable Hot Water Systems


    $ 41.99
    Product includes:
  • Premium Guarantee
  • Contractor Assistance

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