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...
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Bell & Gossett 7.6-Gallon HFT-60 Expansion Tank 1BN328Call or Chat for availability
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Bell & Gossett 20-Gallon HFT-40V Expansion Tank 1BN331In stock (1 unit)
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Bell & Gossett 14-Gallon HFT-90 Expansion Tank 1BN329In stock (1 unit)
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Bell & Gossett 4.4-Gallon HFT-30 Expansion Tank 1BN327In stock (1 unit)
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Bell & Gossett 110-Gallon D200V Expansion Tank 116531Call or Chat for availability
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Bell & Gossett 90-Gallon D180 Expansion Tank 116508Call or Chat for availability
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Bell & Gossett 35-Gallon D-60 Expansion Tank 116301In stock (1 unit)
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Bell & Gossett 110-Gallon D200 Expansion Tank 116509Call or Chat for availability
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Bell & Gossett 77-Gallon D144 Expansion Tank 116507Call or Chat for availability
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Dependable Pressure Control for Closed Hydronic Systems
Non-ASME pre-charged diaphragm expansion tanks are designed to help manage thermal expansion in closed hydronic heating and cooling systems. Commonly used in residential and light commercial applications, these tanks help maintain proper system pressure, improve performance, and protect system components from excessive pressure buildup.
As water heats and expands, the diaphragm tank absorbs the added volume to help keep the system operating safely and efficiently. A heavy-duty butyl diaphragm separates the system water from the tank’s air charge, helping prevent waterlogging while reducing oxygen-related corrosion.
With flexible in-line or floor-mount installation options, diaphragm expansion tanks provide a practical and reliable solution for supporting closed-loop hydronic systems.
Product Features
- Designed for closed hydronic heating and cooling systems
- Suitable for residential and light commercial applications
- Helps prevent excessive pressure in heating systems
- Supports improved system performance and stability
- Helps reduce oxygen corrosion
- Prevents waterlogging
- Heavy-duty butyl diaphragm separates system water from the tank’s air charge
- Available for in-line or floor-mount installation
- Maximum operating temperature: 240°F / 115°C
- Maximum working pressure: 100 PSI / 689 kPa
From the Atoms & Bits Blog
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 ...
Thermal expansion relief valves and tanks are interchangeable components to compensate for water expansion in closed-loop systems.
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 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.