Expansion Tanks

Expansion Tank Size Calculator - This tool will help you find what size expansion tank you need and will suggest which model will work for your system.

This category contains Amtrol WELL-X-TROL pre-pressurized well tanks, available in a variety of models and sizes, as well as THERM-X-TROL expansion tanks, designed for use in potable water systems and open loop heating systems.

49 products shown

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  • THERM-X-TROL ST-5 Expansion Tank View Specs

    THERM-X-TROL ST-5 Expansion Tank

    • SKU: 140N43
    • Brand: Amtrol
    In Stock!
    38 Avail (Ships in 24-48 Hrs)

    $43.49 / each

    $165.96 / box
    4 x $41.49

     
  • THERM-X-TROL ST-12 Expansion Tank View Specs

    THERM-X-TROL ST-12 Expansion Tank

    • SKU: 141N43
    • Brand: Amtrol
    In Stock!
    25 Avail (Ships in 24-48 Hrs)

    $57.49 / each

    $219.80 / box
    4 x $54.95

     
  • THERM-X-TROL ST-25V Expansion Tank (10.3 Gallon Volume) View Specs

    THERM-X-TROL ST-25V Expansion Tank
    (10.3 Gallon)

    • SKU: 143N164
    • Brand: Amtrol
    In Stock!
    7 Avail (Ships in 24-48 Hrs)

    $103.49 / each

     
  • THERM-X-TROL ST-30V Expansion Tank (14 Gallon Volume) View Specs

    THERM-X-TROL ST-30V Expansion Tank
    (14 Gallon)

    • SKU: 143N273
    • Brand: Amtrol
    In Stock!
    1 Avail (Ships in 24-48 Hrs)

    $171.95 / each

     
  • THERM-X-TROL ST-42V Expansion Tank (20 Gallon Volume) View Specs

    THERM-X-TROL ST-42V Expansion Tank
    (20 Gallon)

    • SKU: 144N177
    • Brand: Amtrol
    In Stock!
    1 Avail (Ships in 24-48 Hrs)

    $239.95 / each

     
  • THERM-X-TROL ST-60V Expansion Tank (34 Gallon Volume) View Specs

    THERM-X-TROL ST-60V Expansion Tank
    (34 Gallon)

    • SKU: 147N130
    • Brand: Amtrol
    In Stock!
    4 Avail (Ships in 24-48 Hrs)

    $279.95 / each

     
  • THERM-X-TROL ST-80V Expansion Tank (44 Gallon Volume) View Specs

    THERM-X-TROL ST-80V Expansion Tank
    (44 Gallon)

    • SKU: 147N131
    • Brand: Amtrol
    In Stock!
    2 Avail (Ships in 24-48 Hrs)

    $333.95 / each

    Free Shipping
  • THERM-X-TROL ST-180V Expansion Tank (62 Gallon Volume) View Specs

    THERM-X-TROL ST-180V Expansion Tank
    (62 Gallon)

    • SKU: 148N118
    • Brand: Amtrol
    Usually Ships 7-10 Days

    $459.95 / each

    Free Shipping
  • THERM-X-TROL ST-210V Expansion Tank (86 Gallon Volume) View Specs

    THERM-X-TROL ST-210V Expansion Tank
    (86 Gallon)

    • SKU: 150N32
    • Brand: Amtrol
    Usually Ships 7-10 Days

    $499.95 / each

    Free Shipping
  • THERM-X-SPAN T-5 Expansion Tank (2 Gallon Volume) View Specs

    THERM-X-SPAN T-5 Expansion Tank
    (2 Gallon)

    • SKU: 140735
    • Brand: Amtrol
    In Stock!
    15 Avail (Ships in 24-48 Hrs)

    $33.95 / each

    $130.36 / box
    4 x $32.59

     
  • THERM-X-SPAN T-12 Expansion Tank (4.4 Gallon Volume) View Specs

    THERM-X-SPAN T-12 Expansion Tank
    (4.4 Gallon)

    • SKU: 141363
    • Brand: Amtrol
    In Stock!
    29 Avail (Ships in 24-48 Hrs)

    $42.95 / each

    $163.80 / box
    4 x $40.95

     
  • THERM-X-TROL ASME ST-12-C Expansion Tank View Specs

    THERM-X-TROL ASME
    ST-12-C Expansion Tank

    • SKU: 141-326
    • Brand: Amtrol
    Usually Ships 7-10 Days

    $1,399.95 / each

    Free Shipping
  • WX-101 (140PR1), 2 Gal WELL-X-TROL In-Line Well Tank View Specs

    WX-101 (140PR1)
    2 Gal. WELL-X-TROL
    In-Line Well Tank

    • SKU: WX-101
    • Brand: Amtrol
    In Stock!
    7 Avail (Ships in 24-48 Hrs)

    $49.95 / each

     
  • WX-102 (141PR1), 4.4 Gal WELL-X-TROL In-Line Well Tank View Specs

    WX-102 (141PR1)
    4.4 Gal. WELL-X-TROL
    In-Line Well Tank

    • SKU: WX-102
    • Brand: Amtrol
    In Stock!
    5 Avail (Ships in 24-48 Hrs)

    $69.95 / each

     
  • WX-103 (142PR1), 7.6 Gal WELL-X-TROL In-Line Well Tank View Specs

    WX-103 (142PR1)
    7.6 Gal. WELL-X-TROL
    In-Line Well Tank

    • SKU: WX-103
    • Brand: Amtrol
    In Stock!
    2 Avail (Ships in 24-48 Hrs)

    $112.95 / each

     
  • WX-104 (143S75), 10.3 Gal WELL-X-TROL In-Line Well Tank View Specs

    WX-104 (143S75)
    10.3 Gal. WELL-X-TROL
    In-Line Well Tank

    • SKU: WX-104
    • Brand: Amtrol
    Usually Ships 7-10 Days

    $149.95 / each

     
  • WX-200 (143PR30), 14 Gal WELL-X-TROL In-Line Well Tank View Specs

    WX-200 (143PR30)
    14 Gal. WELL-X-TROL
    In-Line Well Tank

    • SKU: WX-200
    • Brand: Amtrol
    In Stock!
    2 Avail (Ships in 24-48 Hrs)

    $159.95 / each

     
  • WX-201 (143S29), 14 Gal WELL-X-TROL Well Tank (Stand) View Specs

    WX-201 (143S29), 14 Gal. WELL-X-TROL Well Tank

    • SKU: WX-201
    • Brand: Amtrol
    In Stock!
    2 Avail (Ships in 24-48 Hrs)

    $168.95 / each

     
  • WX-202 (144S29), 20 Gal WELL-X-TROL Well Tank (Stand) View Specs

    WX-202 (144S29), 20 Gal. WELL-X-TROL Well Tank

    • SKU: WX-202
    • Brand: Amtrol
    In Stock!
    5 Avail (Ships in 24-48 Hrs)

    $194.95 / each

     
  • WX-202XL (144S240), 26 Gal WELL-X-TROL Well Tank (Stand) View Specs

    WX-202XL (144S240)
    26 Gal. WELL-X-TROL
    Well Tank

    • SKU: WX-202XL
    • Brand: Amtrol
    In Stock!
    5 Avail (Ships in 24-48 Hrs)

    $225.89 / each

     

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More about Amtrol

AMTROL revolutionized the hydronic industry in 1954 when they introduced Extrol, the world's first pre-pressurized diaphragm expansion tank. Since then, Amtrol has been the world leader in the design and operation of the vital mechanical systems that are used to control hydronic heating and to store potable water.

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