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
(217)582Mon, Apr 8582Qty Arrives 582 Mon, Apr 8 Questions? Call 1-888-757-4774 -
#15 Extrol Expansion Tank (2 Gallon)SKU: 101-1Brand: Amtrol(58)463Mon, Apr 8463Qty Arrives 463 Mon, Apr 8 Questions? Call 1-888-757-4774 -
#60 Extrol Expansion Tank (7.6 Gallon)SKU: 103-1Brand: Amtrol(28)111Mon, Apr 8111Qty Arrives 111 Mon, Apr 8 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(40)49Mon, Apr 849Qty Arrives 49 Mon, Apr 8 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (2.5 Gal. Capacity)SKU: QS-5Brand: Holdrite(25)41Mon, Apr 841Qty Arrives 41 Mon, Apr 8 Questions? Call 1-888-757-4774 -
QuickStrap Expansion Tank Mounting Bracket (5 Gal. Capacity)SKU: QS-12Brand: Holdrite(27)83Mon, Apr 883Qty Arrives 83 Mon, Apr 8 Questions? Call 1-888-757-4774 -
8" HydroClaw Expansion Tank Support BracketSKU: HC8-BBrand: Storm King Enterprises(24)1Mon, Apr 81Qty Arrives 1 Mon, Apr 8 Questions? Call 1-888-757-4774 -
ETX-30, Non-Potable Water Expansion Tank (4.5 Gallon)SKU: 0066606Brand: Watts(12)130Mon, Apr 8130Qty Arrives 130 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Flexconsole - 1/2" x 1/2" NPT - Steel (Red)
SKU: 97975Brand: Flamco(7)102Mon, Apr 8102Qty Arrives 102 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol w/ Valve (4.4 Gallon)SKU: 110-1Brand: Amtrol(34)67Mon, Apr 867Qty Arrives 67 Mon, Apr 8 Questions? Call 1-888-757-4774 -
SX-30V Extrol Expansion Tank (14 Gallon)SKU: 118-27Brand: Amtrol(6)3Mon, Apr 83Qty Arrives 3 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol w/ Valve (2 Gallon)SKU: 109-1Brand: Amtrol(15)8Mon, Apr 88Qty Arrives 8 Mon, Apr 8 Questions? Call 1-888-757-4774 -
RX-30 Radiant Extrol Expansion Tank (4.4 Gallon)SKU: 141-305Brand: Amtrol(10)24Mon, Apr 824Qty Arrives 24 Mon, Apr 8 Questions? Call 1-888-757-4774 -
#90 Extrol Expansion Tank (14 Gallon)SKU: 112-1Brand: Amtrol40Mon, Apr 840Qty Arrives 40 Mon, Apr 8 Questions? Call 1-888-757-4774 -
SX-40V Extrol Expansion Tank (20 Gallon)SKU: 118-78Brand: Amtrol(9)13Mon, Apr 813Qty Arrives 13 Mon, Apr 8 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)38Mon, Apr 838Qty Arrives 38 Mon, Apr 8 Questions? Call 1-888-757-4774 -
ETX-15, Non-Potable Water Expansion Tank (2.1 Gallon)SKU: 0066605Brand: Watts(1)35Mon, Apr 835Qty Arrives 35 Mon, Apr 8 Questions? Call 1-888-757-4774 -
RX-15 Radiant Extrol Expansion Tank (2 Gallon)SKU: 140-705Brand: Amtrol(6)25Mon, Apr 825Qty Arrives 25 Mon, Apr 8 Questions? Call 1-888-757-4774 -
ETX-60, Non-Potable Water Expansion Tank (6.0 Gallon)SKU: 0066607Brand: Watts(5)47Mon, Apr 847Qty Arrives 47 Mon, Apr 8 Questions? Call 1-888-757-4774 -
RBFF, 1/2" Residential Boiler Fill FittingSKU: 0386466Brand: Watts(3)17Mon, Apr 817Qty Arrives 17 Mon, Apr 8 Questions? Call 1-888-757-4774 -
1/2" External NPT Heating Expansion Tank (4.4 Gallon)SKU: TK300-30Brand: Honeywell-Sparco(1)24Mon, Apr 824Qty Arrives 24 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Flexconsole - 3/4" x 1/2" NPT - Stainless Steel (White)SKU: 97976-FLAMCOBrand: Flamco11Mon, Apr 811Qty Arrives 11 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Model 110 Fill-Trol Tank Only (4.4 Gallon)SKU: 110-002Brand: Amtrol(10)19Mon, Apr 819Qty Arrives 19 Mon, Apr 8 Questions? Call 1-888-757-4774 -
Model 109 Fill-Trol, Tank Only (2 Gallon)SKU: 109-133Brand: Amtrol(12)15Mon, Apr 815Qty Arrives 15 Mon, Apr 8 Questions? Call 1-888-757-4774 -
SX-90V Extrol Expansion Tank (44 Gallon)SKU: 118-153Brand: Amtrol(3)7Mon, Apr 87Qty Arrives 7 Mon, Apr 8 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)11Mon, Apr 811Qty Arrives 11 Mon, Apr 8 Questions? Call 1-888-757-4774 -
DT-2 Drain-O-Tank Air ChargerSKU: 113041Brand: Bell & Gossett(2)
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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