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Expansion Tanks
Lead Content Warning
Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.
Lead Content Warning
This product does not comply with the Safe Drinking Water Act, which requires that products used in any system providing water for human consumption (drinking or cooking) to meet low-lead standards. Please check the box below to confirm you are aware that this item is for non-potable water applications only.
You must agree to this statement in order to purchase this product.
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11" HydroClaw Expansion Tank Support BracketSKU: HC11-ABrand: Storm King Enterprises
(37)131Thu, Dec 27131Qty Arrives 131 Thu, Dec 27 Questions? Call 1-888-757-4774 -
THERM-X-TROL ST-12 Expansion TankSKU: 141N43Brand: Amtrol(32)Fri, Jan 18 – Fri, Jan 25 -
3/4" Threaded Spring Loaded Check Valve, Lead FreeSKU: SLCT075Brand: Bluefin(26)1,054Thu, Dec 271,054Qty Arrives 1,054 Thu, Dec 27 Questions? Call 1-888-757-4774 -
1" Threaded Spring Loaded Check Valve Lead FreeSKU: SLCT100Brand: Bluefin(26)102Thu, Dec 27102Qty Arrives 102 Thu, Dec 27 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (2.5 Gal. Capacity)SKU: QS-5Brand: Holdrite(23)128Thu, Dec 27128Qty Arrives 128 Thu, Dec 27 Questions? Call 1-888-757-4774 -
WX-250 (145S1), 44 Gal. WELL-X-TROL Well TankSKU: WX-250Brand: Amtrol(65)1Thu, Dec 271Qty Arrives 1 Thu, Dec 27 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (5 Gal. Capacity)SKU: QS-12Brand: Holdrite(27)70Thu, Dec 2770Qty Arrives 70 Thu, Dec 27 Questions? Call 1-888-757-4774 -
PLT-5, 2.1 Gallon Potable Water Expansion TankSKU: 0067370Brand: Watts(4)111Thu, Dec 27111Qty Arrives 111 Thu, Dec 27 Questions? Call 1-888-757-4774 -
WX-203 (146S30), 32 Gal. WELL-X-TROL Well TankSKU: WX-203Brand: Amtrol(60)Fri, Jan 18 – Fri, Jan 25 -
WX-202 (144S29), 20 Gal. WELL-X-TROL Well TankSKU: WX-202Brand: Amtrol(46)39Thu, Dec 2739Qty Arrives 39 Thu, Dec 27 Questions? Call 1-888-757-4774 -
8" HydroClaw Expansion Tank Support BracketSKU: HC8-BBrand: Storm King Enterprises(23)82Thu, Dec 2782Qty Arrives 82 Thu, Dec 27 Questions? Call 1-888-757-4774 -
1/2" Threaded Spring Loaded Check Valve, Lead FreeSKU: SLCT050Brand: Bluefin(26)1,489Thu, Dec 271,489Qty Arrives 1,489 Thu, Dec 27 Questions? Call 1-888-757-4774 -
THERM-X-SPAN T-5 Expansion Tank (2 Gallon)SKU: 140735Brand: Amtrol(12)Fri, Jan 18 – Fri, Jan 25 -
Pressure Switch, 40/60 PSI, 10 Amp, DPSTSKU: 9013FSG2J24Brand: Square D(8) -
WX-202XL (144S240) 26 Gal. WELL-X-TROL Well TankSKU: WX-202XLBrand: Amtrol(38)9Thu, Dec 279Qty Arrives 9 Thu, Dec 27 Questions? Call 1-888-757-4774 -
THERM-X-TROL ST-8 Expansion TankSKU: 140N738Brand: Amtrol(9)6Thu, Dec 276Qty Arrives 6 Thu, Dec 27 Questions? Call 1-888-757-4774 -
WX-302 (150S1), 86 Gal. WELL-X-TROL Well TankSKU: WX-302Brand: Amtrol(24)2Wed, Jan 2 – Fri, Jan 42Qty Arrives 2 Wed, Jan 2 – Fri, Jan 4 Questions? Call 1-888-757-4774 -
WX-101 (140PR1) 2 Gal. WELL-X-TROL In-Line Well TankSKU: WX-101Brand: Amtrol(12)14Thu, Dec 2714Qty Arrives 14 Thu, Dec 27 Questions? Call 1-888-757-4774 -
1-1/4" Threaded Spring Loaded Check Valve, Lead FreeSKU: SLCT125Brand: Bluefin(26)226Thu, Dec 27226Qty Arrives 226 Thu, Dec 27 Questions? Call 1-888-757-4774 -
WX-255 (149S147), 81 Gal. WELL-X-TROL Well TankSKU: WX-255Brand: Amtrol(27)7Wed, Jan 2 – Fri, Jan 47Qty Arrives 7 Wed, Jan 2 – Fri, Jan 4 Questions? Call 1-888-757-4774 -
THERM-X-TROL ST-25V Expansion Tank (10.3 Gallon)SKU: 143N164Brand: Amtrol(6)76Thu, Dec 2776Qty Arrives 76 Thu, Dec 27 Questions? Call 1-888-757-4774 -
Water Pump Pressure Switch, 30/50 PSI, DPSTSKU: 9013FSG2J21Brand: Square D(1) -
WX-350 (151S1) 119 Gal. WELL-X-TROL Well TankSKU: WX-350Brand: Amtrol(16)Wed, Jan 23 – Fri, Feb 1 -
WX-251 (145S10), 62 Gal. WELL-X-TROL Well TankSKU: WX-251Brand: Amtrol(32)6Wed, Jan 2 – Fri, Jan 46Qty Arrives 6 Wed, Jan 2 – Fri, Jan 4 Questions? Call 1-888-757-4774 -
DuraBase Tank Spacer for 22" & 26" Steel StandSKU: DURABASE-22Brand: Amtrol(6)Fri, Jan 18 – Fri, Jan 25 -
THERM-X-SPAN T-12 Expansion Tank (4.4 Gallon)SKU: 141363Brand: Amtrol(3)Fri, Jan 18 – Fri, Jan 25 -
WX-102 (141PR1) 4.4 Gal. WELL-X-TROL In-Line Well TankSKU: WX-102Brand: Amtrol(11)13Thu, Dec 2713Qty Arrives 13 Thu, Dec 27 Questions? Call 1-888-757-4774 -
1-1/2" Threaded Spring Loaded Check Valve, Lead FreeSKU: SLCT150Brand: Bluefin(26)35Thu, Dec 2735Qty Arrives 35 Thu, Dec 27 Questions? Call 1-888-757-4774 -
Expansion Tank Support Kit w/ 32.5" Band for 2 Gallon TanksSKU: 598-0210Brand: Sioux Chief(1)18Thu, Dec 2718Qty Arrives 18 Thu, Dec 27 Questions? Call 1-888-757-4774 -
WX-205 (147S44) 34 Gal. WELL-X-TROLSKU: WX-205Brand: Amtrol(18)7Thu, Dec 277Qty Arrives 7 Thu, Dec 27 Questions? Call 1-888-757-4774
Resources
Articles
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More About Expansion Tanks
An expansion tank is designed to relieve pressure in both a potable water and closed heating system. An expansion tank ensures a constant pressure is maintained within the pipes so they do not get damaged from excess pressure.
An expansion tank has two parts which are divided by a rubber diaphragm. The top portion of the tank is connected to the hot water system and is filled with water. The bottom portion is filled with air set at approximately 12 psi. As the hot water system is turned on or off, pressure increases. As pressure increases, the diaphragm in the expansion tank is pushed down. This compresses the air in the tank, creating more space for excess water to enter. This relieves excess pressure in the system and prevents pipes in the system from being damaged.
In the event that the diaphragm fails, the tank will completely fill with water. If this occurs, the tank must be replaced immediately. To check if the expansion tank is working properly, simply place your hand on the tank and feel its temperature. The top portion of the tank should feel warm to the touch, and the bottom portion of the tank should be room temperature. If the entire tank is warm, it is likely that the tank has completely filled with hot water.
Expansion tanks have capacities ranging from 2 gallons to several hundred gallons. To determine the size needed for your system, use the Expansion Tank Size Calculator located here.
We offer a wide selection of Therm-X-Trol and Well-X-Trol expansion tanks to suit all of your plumbing and heating needs.
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