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Bell & Gossett Bladder Expansion Tanks

Bladder expansion tanks are pressure management components designed to absorb thermal expansion in closed-loop hydronic heating and cooling systems. Their bladder-style construction separates air and water within the tank, helping maintain stable system pressure, protect connected equipment, and support reliable operation in applications where controlled expansion, reduced system stress, and dependable long-term performance are important.

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Bell & Gossett 1057-Gallon B-4 Expansion Tank 116796
Bell & Gossett
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Bell & Gossett 1057-Gallon B-4 Expansion Tank 116796
Sale price$43,938.95 Regular price$78,462.00
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Bell & Gossett 1980-Gallon B-7500 Expansion Tank 116841
Bell & Gossett
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Bell & Gossett 1980-Gallon B-7500 Expansion Tank 116841
Sale price$81,560.95 Regular price$145,645.00
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Bell & Gossett 2640-Gallon B-10 Expansion Tank 116842
Bell & Gossett
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Bell & Gossett 2640-Gallon B-10 Expansion Tank 116842
Sale price$104,356.95 Regular price$186,352.00
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Bell & Gossett 1321-Gallon B-5 Expansion Tank 116819
Bell & Gossett
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Bell & Gossett 1321-Gallon B-5 Expansion Tank 116819
Sale price$56,895.95 Regular price$101,601.00
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Bell & Gossett 925-Gallon B-3500 Expansion Tank 116795
Bell & Gossett
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Bell & Gossett 925-Gallon B-3500 Expansion Tank 116795
Sale price$41,240.95 Regular price$73,646.00
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Bell & Gossett 792-Gallon B-3 Expansion Tank 116794
Bell & Gossett
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Bell & Gossett 792-Gallon B-3 Expansion Tank 116794
Sale price$28,464.95 Regular price$50,832.00
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Bell & Gossett 660-Gallon B-2500 Expansion Tank 116793
Bell & Gossett
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Bell & Gossett 660-Gallon B-2500 Expansion Tank 116793
Sale price$22,143.95 Regular price$39,542.00
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Bell & Gossett 422-Gallon B-1600 Expansion Tank 116559
Bell & Gossett
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Bell & Gossett 422-Gallon B-1600 Expansion Tank 116559
Sale price$17,966.95 Regular price$32,083.00
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Bladder expansion tanks from Bell & Gossett contain a balloon-like bladder or rubber membrane within the shell that can be replaced when required. Pre-charged bladder expansion tanks from Bell & Gossett absorb thermal expansion forces in hydronic heating and cooling systems. Their rubber membranes isolate the air from the system fluid, preventing waterlogging, and the pre-charge minimizes the size of the tank.

From the Atoms & Bits Blog

Bell & Gossett Expansion Tanks: Models Overview

Bell & Gossett Expansion Tanks: Models Overview

Published: May 21, 2026 By: Lucas Gasparotto

Bell and Gossett expansion tanks help protect hydronic, plumbing, and well water systems from pressure problems caused by thermal expansion and pump cycling. This guide explains how B&G expansi...

Expansion Tanks vs. Buffer Tanks

Expansion Tanks vs. Buffer Tanks

Published: Feb 28, 2023 By: Laura Eck

An expansion tank allows for the expansion and contraction of a system when it heats up and cools off and provides head pressure for the circulation pump. A buffer tank adds volume to a heating or ...

Expansion Tank vs. Pressure Tank

Expansion Tanks vs. Pressure Tanks

Published: Jan 25, 2023 By: Laura Eck

Although very similar, pressure tanks and expansion tanks perform unique functions. Expansion tanks compensate for water expansion in closed-loop systems, while pressure tanks maintain the water pr...

Bladder Tanks vs. Diaphragm Tanks

Bladder Tanks vs. Diaphragm Tanks

Published: Nov 01, 2022 By: Laura Eck

Bladder expansion tanks contain a balloon-like bladder that can be replaced when required. On the other hand, a diaphragm expansion tank includes a flat diaphragm directly mounted to the tank.

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