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
(216)634Tue, Apr 2634Qty Arrives 634 Tue, Apr 2 Questions? Call 1-888-757-4774 -
#15 Extrol Expansion Tank (2 Gallon)SKU: 101-1Brand: Amtrol(58)492Tue, Apr 2492Qty Arrives 492 Tue, Apr 2 Questions? Call 1-888-757-4774 -
#60 Extrol Expansion Tank (7.6 Gallon)SKU: 103-1Brand: Amtrol(28)128Tue, Apr 2128Qty Arrives 128 Tue, Apr 2 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(39)60Tue, Apr 260Qty Arrives 60 Tue, Apr 2 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (2.5 Gal. Capacity)SKU: QS-5Brand: Holdrite(25)101Tue, Apr 2101Qty Arrives 101 Tue, Apr 2 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (5 Gal. Capacity)SKU: QS-12Brand: Holdrite(27)122Tue, Apr 2122Qty Arrives 122 Tue, Apr 2 Questions? Call 1-888-757-4774 -
8" HydroClaw Expansion Tank Support BracketSKU: HC8-BBrand: Storm King Enterprises(24)8Tue, Apr 28Qty Arrives 8 Tue, Apr 2 Questions? Call 1-888-757-4774 -
ETX-30, Non-Potable Water Expansion Tank (4.5 Gallon)SKU: 0066606Brand: Watts(12)98Tue, Apr 298Qty Arrives 98 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Flexconsole - 1/2" x 1/2" NPT - Steel (Red)
SKU: 97975Brand: Flamco(6)92Tue, Apr 292Qty Arrives 92 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol w/ Valve (4.4 Gallon)SKU: 110-1Brand: Amtrol(34)75Tue, Apr 275Qty Arrives 75 Tue, Apr 2 Questions? Call 1-888-757-4774 -
SX-30V Extrol Expansion Tank (14 Gallon)SKU: 118-27Brand: Amtrol(6)8Tue, Apr 28Qty Arrives 8 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol w/ Valve (2 Gallon)SKU: 109-1Brand: Amtrol(15)15Tue, Apr 215Qty Arrives 15 Tue, Apr 2 Questions? Call 1-888-757-4774 -
RX-30 Radiant Extrol Expansion Tank (4.4 Gallon)SKU: 141-305Brand: Amtrol(10)36Tue, Apr 236Qty Arrives 36 Tue, Apr 2 Questions? Call 1-888-757-4774 -
#90 Extrol Expansion Tank (14 Gallon)SKU: 112-1Brand: Amtrol(10)44Tue, Apr 244Qty Arrives 44 Tue, Apr 2 Questions? Call 1-888-757-4774 -
SX-40V Extrol Expansion Tank (20 Gallon)SKU: 118-78Brand: Amtrol(9)20Tue, Apr 220Qty Arrives 20 Tue, Apr 2 Questions? Call 1-888-757-4774 -
SX-60V Extrol Expansion Tank (32 Gallon)SKU: 118-79Brand: Amtrol(1) -
Fill Control ValveSKU: 109-15Brand: Amtrol(7)43Tue, Apr 243Qty Arrives 43 Tue, Apr 2 Questions? Call 1-888-757-4774 -
ETX-15, Non-Potable Water Expansion Tank (2.1 Gallon)SKU: 0066605Brand: Watts(1)14Tue, Apr 214Qty Arrives 14 Tue, Apr 2 Questions? Call 1-888-757-4774 -
RX-15 Radiant Extrol Expansion Tank (2 Gallon)SKU: 140-705Brand: Amtrol(6)26Tue, Apr 226Qty Arrives 26 Tue, Apr 2 Questions? Call 1-888-757-4774 -
ETX-60, Non-Potable Water Expansion Tank (6.0 Gallon)SKU: 0066607Brand: Watts(5)44Tue, Apr 244Qty Arrives 44 Tue, Apr 2 Questions? Call 1-888-757-4774 -
RBFF, 1/2" Residential Boiler Fill FittingSKU: 0386466Brand: Watts(3)1Tue, Apr 21Qty Arrives 1 Tue, Apr 2 Questions? Call 1-888-757-4774 -
1/2" External NPT Heating Expansion Tank (4.4 Gallon)SKU: TK300-30Brand: Honeywell-Sparco(1)24Tue, Apr 224Qty Arrives 24 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Flexconsole - 3/4" x 1/2" NPT - Stainless Steel (White)SKU: 97976-FLAMCOBrand: Flamco12Tue, Apr 212Qty Arrives 12 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol Tank Only (4.4 Gallon)SKU: 110-002Brand: Amtrol(10)20Tue, Apr 220Qty Arrives 20 Tue, Apr 2 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol, Tank Only (2 Gallon)SKU: 109-133Brand: Amtrol(12)16Tue, Apr 216Qty Arrives 16 Tue, Apr 2 Questions? Call 1-888-757-4774 -
SX-90V Extrol Expansion Tank (44 Gallon)SKU: 118-153Brand: Amtrol(3)9Tue, Apr 29Qty Arrives 9 Tue, Apr 2 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)11Tue, Apr 211Qty Arrives 11 Tue, Apr 2 Questions? Call 1-888-757-4774 -
DT-2 Drain-O-Tank Air ChargerSKU: 113041Brand: Bell & Gossett(1)
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 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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