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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
(193)1,495Wed, Oct 311,495Qty Arrives 1,495 Wed, Oct 31 Questions? Call 1-888-757-4774 -
#15 Extrol Expansion Tank (2 Gallon)SKU: 101-1Brand: Amtrol(51)503Wed, Oct 31503Qty Arrives 503 Wed, Oct 31 Questions? Call 1-888-757-4774 -
#60 Extrol Expansion Tank (7.6 Gallon)SKU: 103-1Brand: Amtrol(25)349Wed, Oct 31349Qty Arrives 349 Wed, Oct 31 Questions? Call 1-888-757-4774 -
1/2" Pro-Pal Full Port Brass Ball Valve w/ Hi-Flow Hose Drain
SKU: 41672Brand: Webstone(8) -
11" HydroClaw Expansion Tank Support BracketSKU: HC11-ABrand: Storm King Enterprises(37)72Wed, Oct 3172Qty Arrives 72 Wed, Oct 31 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (2.5 Gal. Capacity)SKU: QS-5Brand: Holdrite(23)141Wed, Oct 31141Qty Arrives 141 Wed, Oct 31 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (5 Gal. Capacity)SKU: QS-12Brand: Holdrite(26)203Wed, Oct 31203Qty Arrives 203 Wed, Oct 31 Questions? Call 1-888-757-4774 -
ETX-30, Non-Potable Water Expansion Tank (4.5 Gallon)SKU: 0066606Brand: Watts(12)182Wed, Oct 31182Qty Arrives 182 Wed, Oct 31 Questions? Call 1-888-757-4774 -
8" HydroClaw Expansion Tank Support BracketSKU: HC8-BBrand: Storm King Enterprises(22)43Wed, Oct 3143Qty Arrives 43 Wed, Oct 31 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol w/ Valve (4.4 Gallon)SKU: 110-1Brand: Amtrol(30) -
SX-30V Extrol Expansion Tank (14 Gallon)SKU: 118-27Brand: Amtrol(5)43Wed, Oct 3143Qty Arrives 43 Wed, Oct 31 Questions? Call 1-888-757-4774 -
Flexconsole - 1/2" x 1/2" NPT - Steel (Red)
SKU: 97975Brand: Flamco(1)77Wed, Oct 3177Qty Arrives 77 Wed, Oct 31 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol w/ Valve (2 Gallon)SKU: 109-1Brand: Amtrol(14)60Wed, Oct 3160Qty Arrives 60 Wed, Oct 31 Questions? Call 1-888-757-4774 -
RX-30 Radiant Extrol Expansion Tank (4.4 Gallon)SKU: 141-305Brand: Amtrol(9) -
#90 Extrol Expansion Tank (14 Gallon)SKU: 112-1Brand: Amtrol(9)84Wed, Oct 3184Qty Arrives 84 Wed, Oct 31 Questions? Call 1-888-757-4774 -
SX-40V Extrol Expansion Tank (20 Gallon)SKU: 118-78Brand: Amtrol(8) -
ETX-60, Non-Potable Water Expansion Tank (6.0 Gallon)SKU: 0066607Brand: Watts(5) -
ETX-15, Non-Potable Water Expansion Tank (2.1 Gallon)SKU: 0066605Brand: Watts(1)100Wed, Oct 31100Qty Arrives 100 Wed, Oct 31 Questions? Call 1-888-757-4774 -
Fill Control ValveSKU: 109-15Brand: Amtrol(7) -
SX-60V Extrol Expansion Tank (32 Gallon)SKU: 118-79Brand: Amtrol(1) -
RX-15 Radiant Extrol Expansion Tank (2 Gallon)SKU: 140-705Brand: Amtrol(5) -
Model 110 Fill-Trol Tank Only (4.4 Gallon)SKU: 110-002Brand: Amtrol(10) -
RBFF, 1/2" Residential Boiler Fill FittingSKU: 0386466Brand: Watts(3)37Wed, Oct 3137Qty Arrives 37 Wed, Oct 31 Questions? Call 1-888-757-4774 -
1/2" External NPT Heating Expansion Tank (4.4 Gallon)SKU: TK300-30Brand: Honeywell-Sparco(1) -
Flexconsole - 3/4" x 1/2" NPT - Stainless Steel (White)SKU: 97976-FLAMCOBrand: Flamco12Wed, Oct 3112Qty Arrives 12 Wed, Oct 31 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol, Tank Only (2 Gallon)SKU: 109-133Brand: Amtrol(11)6Wed, Oct 316Qty Arrives 6 Wed, Oct 31 Questions? Call 1-888-757-4774 -
HFT-30, Hydronic Heating Expansion Tank (4.4 Gallon)SKU: 1BN327Brand: Bell & Gossett(1) -
SX-90V Extrol Expansion Tank (44 Gallon)SKU: 118-153Brand: Amtrol(3)8Wed, Oct 318Qty Arrives 8 Wed, Oct 31 Questions? Call 1-888-757-4774 -
DT-2 Drain-O-Tank Air ChargerSKU: 113041Brand: Bell & Gossett(1) -
RX-60 Radiant Extrol Expansion Tank (10.3 Gallon)SKU: 143-381Brand: Amtrol(3)6Wed, Oct 316Qty Arrives 6 Wed, Oct 31 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 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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