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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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#30 Extrol Expansion Tank (4.4 Gallon)SKU: 102-1Brand: Amtrol
(210)2,174Mon, Feb 42,174Qty Arrives 2,174 Mon, Feb 4 Questions? Call 1-888-757-4774 -
#15 Extrol Expansion Tank (2 Gallon)SKU: 101-1Brand: Amtrol(56)763Mon, Feb 4763Qty Arrives 763 Mon, Feb 4 Questions? Call 1-888-757-4774 -
#60 Extrol Expansion Tank (7.6 Gallon)SKU: 103-1Brand: Amtrol(27)373Mon, Feb 4373Qty Arrives 373 Mon, Feb 4 Questions? Call 1-888-757-4774 -
1/2" Pro-Pal Full Port Brass Ball Valve w/ Hi-Flow Hose Drain
SKU: 41672Brand: Webstone(9) -
11" HydroClaw Expansion Tank Support BracketSKU: HC11-ABrand: Storm King Enterprises(37)95Mon, Feb 495Qty Arrives 95 Mon, Feb 4 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (2.5 Gal. Capacity)SKU: QS-5Brand: Holdrite(24)157Mon, Feb 4157Qty Arrives 157 Mon, Feb 4 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (5 Gal. Capacity)SKU: QS-12Brand: Holdrite(27)154Mon, Feb 4154Qty Arrives 154 Mon, Feb 4 Questions? Call 1-888-757-4774 -
ETX-30, Non-Potable Water Expansion Tank (4.5 Gallon)SKU: 0066606Brand: Watts(12)143Mon, Feb 4143Qty Arrives 143 Mon, Feb 4 Questions? Call 1-888-757-4774 -
8" HydroClaw Expansion Tank Support BracketSKU: HC8-BBrand: Storm King Enterprises(23)44Mon, Feb 444Qty Arrives 44 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Flexconsole - 1/2" x 1/2" NPT - Steel (Red)
SKU: 97975Brand: Flamco(6)188Mon, Feb 4188Qty Arrives 188 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol w/ Valve (4.4 Gallon)SKU: 110-1Brand: Amtrol(33)133Mon, Feb 4133Qty Arrives 133 Mon, Feb 4 Questions? Call 1-888-757-4774 -
SX-30V Extrol Expansion Tank (14 Gallon)SKU: 118-27Brand: Amtrol(6)78Mon, Feb 478Qty Arrives 78 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol w/ Valve (2 Gallon)SKU: 109-1Brand: Amtrol(15)83Mon, Feb 483Qty Arrives 83 Mon, Feb 4 Questions? Call 1-888-757-4774 -
RX-30 Radiant Extrol Expansion Tank (4.4 Gallon)SKU: 141-305Brand: Amtrol(10)69Mon, Feb 469Qty Arrives 69 Mon, Feb 4 Questions? Call 1-888-757-4774 -
#90 Extrol Expansion Tank (14 Gallon)SKU: 112-1Brand: Amtrol(10)82Mon, Feb 482Qty Arrives 82 Mon, Feb 4 Questions? Call 1-888-757-4774 -
SX-40V Extrol Expansion Tank (20 Gallon)SKU: 118-78Brand: Amtrol(8)66Mon, Feb 466Qty Arrives 66 Mon, Feb 4 Questions? Call 1-888-757-4774 -
SX-60V Extrol Expansion Tank (32 Gallon)SKU: 118-79Brand: Amtrol(1)33Mon, Feb 433Qty Arrives 33 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Fill Control ValveSKU: 109-15Brand: Amtrol(7)71Mon, Feb 471Qty Arrives 71 Mon, Feb 4 Questions? Call 1-888-757-4774 -
ETX-15, Non-Potable Water Expansion Tank (2.1 Gallon)SKU: 0066605Brand: Watts(1)25Mon, Feb 425Qty Arrives 25 Mon, Feb 4 Questions? Call 1-888-757-4774 -
ETX-60, Non-Potable Water Expansion Tank (6.0 Gallon)SKU: 0066607Brand: Watts(5)58Mon, Feb 458Qty Arrives 58 Mon, Feb 4 Questions? Call 1-888-757-4774 -
RX-15 Radiant Extrol Expansion Tank (2 Gallon)SKU: 140-705Brand: Amtrol(5)37Mon, Feb 437Qty Arrives 37 Mon, Feb 4 Questions? Call 1-888-757-4774 -
RBFF, 1/2" Residential Boiler Fill FittingSKU: 0386466Brand: Watts(3)13Mon, Feb 413Qty Arrives 13 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Flexconsole - 3/4" x 1/2" NPT - Stainless Steel (White)SKU: 97976-FLAMCOBrand: Flamco23Mon, Feb 423Qty Arrives 23 Mon, Feb 4 Questions? Call 1-888-757-4774 -
1/2" External NPT Heating Expansion Tank (4.4 Gallon)SKU: TK300-30Brand: Honeywell-Sparco(1)25Mon, Feb 425Qty Arrives 25 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol Tank Only (4.4 Gallon)SKU: 110-002Brand: Amtrol(10)29Mon, Feb 429Qty Arrives 29 Mon, Feb 4 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol, Tank Only (2 Gallon)SKU: 109-133Brand: Amtrol(12)30Mon, Feb 430Qty Arrives 30 Mon, Feb 4 Questions? Call 1-888-757-4774 -
SX-90V Extrol Expansion Tank (44 Gallon)SKU: 118-153Brand: Amtrol(3)26Mon, Feb 426Qty Arrives 26 Mon, Feb 4 Questions? Call 1-888-757-4774 -
HFT-30, Hydronic Heating Expansion Tank (4.4 Gallon)SKU: 1BN327Brand: Bell & Gossett(1) -
RX-60 Radiant Extrol Expansion Tank (10.3 Gallon)SKU: 143-381Brand: Amtrol(3)12Mon, Feb 412Qty Arrives 12 Mon, Feb 4 Questions? Call 1-888-757-4774 -
DT-2 Drain-O-Tank Air ChargerSKU: 113041Brand: Bell & Gossett(1)
Resources
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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 Sizing Calculator.
We offer a wide selection of Amtrol, Watts, Cash Acme, and Bell & Gossett expansion tanks to suit all of your plumbing and heating needs.
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