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Expansion Tanks for Heating

Amtrol manufactures a wide variety of expansion tanks for heating applications, including residential and commercial hydronic baseboard/radiators heating systems and radiant floor heating systems.
Amtrol heating expansion tank series include:
Extrol - the most popular expansion tank used for closed loop hydronic and radiant heating applications;
Fill-Trol - comprised of an Extrol series tank with a fill valve;
Radiant Extrol - for open loop heating systems or systems with high oxygen content;

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Product Description SKU Qty Unit Price
1/2" Threaded Pro-Pal Expansion Tank Pro Service Valve w/ Hose Drain

Webstone Valves
41672
x1
$14.75 / each
x10
$140.00
($14.00 / each)
Extrol #15 Expansion Tank (2.0 Gal Volume)

Amtrol
101-1

 
x1
$22.35 / each
x4
$84.60 / box
($21.15 / each)
Extrol #30 Expansion Tank (4.4 Gal Volume)

Amtrol
102-1
x1
$27.50 / each
x4
$102.00 / box
($25.50 / each)
Extrol #60 Expansion Tank (7.6 Gal Volume)

Amtrol
103-1

 
x1
$61.95 / each
x4
$237.00 / box
($59.25 / each)
Extrol #90 Expansion Tank (14.0 Gal Volume)

Amtrol
112-1
x1
$86.95 / each
Extrol SX-30V Expansion Tank (14.0 Gal Volume)

Amtrol
118-27

 
x1
$98.95 / each
Extrol SX-40V (118-78) Expansion Tank (20.0 Gal Volume)

Amtrol
118-78
x1
$119.95 / each
Extrol SX-60V Expansion Tank (32.0 Gal Volume)

Free shipping

Amtrol
118-79
x1
$239.95 / each
Extrol SX-90V Expansion Tank (44.0 Gal Volume)

Free shipping

Amtrol
118-153
x1
$385.95 / each
Fill-Trol 109 Expansion Tank w/ Fill Valve (2.0 Gal Volume)

Amtrol
109-1

 
x1
$62.95 / each
x4
$239.80 / box
($59.95 / each)
Fill-Trol 110 Expansion Tank w/ Fill Valve (4.4 Gal Volume)

Amtrol
110-1

 
x1
$74.95 / each
x4
$284.00 / box
($71.00 / each)
Fill-Trol 111 Expansion Tank w/ Fill Valve (7.6 Gal Volume)

Amtrol
111-1
x1
$114.00 / each
RX-15 Radiant Extrol Expansion Tank (140-705), 2.0 gal.

Amtrol
140-705
x1
$46.95 / each
x4
$180.00 / box
($45.00 / each)
RX-30 Radiant Extrol Expansion Tank (141-305), 4.4 gal.

Amtrol
141-305
x1
$58.95 / each
x4
$220.00 / box
($55.00 / each)
RX-60 Radiant Extrol Expansion Tank (143-381), 10.3 gal.

Amtrol
143-381
x1
$145.00 / each
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About Expansion Tanks For Hydronic Heating

A diaphragm type expansion tank is a required component in a hot water hydronic heating system. The tank is constructed of a welded drawn steel body with an internal diaphragm, which internally separates it into (2) chambers. One of the chambers is filled with pressurized air. The other has a threaded inlet and is connected to the supply line near the boiler. As water is heated by the boiler, it expands, an is accommodated by the hydronic expansion tank, with air pressurized chamber acting like a cushion. This prevents formation of excess pressure which may cause damage to systems' components and prevents the frequent discharge of the pressure relief valve.

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