Expansion Tanks
We stock expansion tanks from Bell & Gossett, Armstrong, Taco HVAC, Wessels and more. Expansion Tanks are available with either bladders or diaphragms so that water and air are permanently separated. No absorption can take place at any point during the system cycle, and you avoid the problems of waterlogged tanks, air-bound terminal units, excessive corrosion, inefficient balancing and pump cavitations. Plain steel tanks are also available. Please give us a call and we can help you find the right expansion tank for your needs.
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112008 Bell & Gossett ATF-9 Airtrol Tank Fittings
Bell & Gossett
$228.00112008 Bell & Gossett ATF-9 Airtrol Tank Fittings. Connection Size: Tank - 1/2"M, Boiler - 3/4"F. Bell & Gossett Airtrol Tank Fittings help to establish proper initial liquid level in the compression tank when filling the hydronic system. They...$228.00 -
CBX254-125 Taco 600-9613RP Expansion Tank Bladder Only
Taco
$3,173.40CBX254-125 Taco 600-9613RP Expansion Tank Bladder Only. *Vertical Installation Only. Taco CBX Expansion Tanks are bladder type tanks that provide permanent separation of air and water. Designed for use in hydronic systems and non-potable,...$3,173.40 -
AX-20V Armstrong Pre-charged ASME Expansion Tank
Armstrong
$1,987.00AX-20V Armstrong Pre-charged ASME Expansion Tank. Tank Volume 35.0 gal, (41.6 L). Armstrong Series AX & AX-V Diaphragm Tanks. Armstrong Expansion Tanks are designed to reduce tank sizes by up to 80% over standard designs. Expansion tanks...$1,987.00 -
CX130-125 Taco 35 Gal Diaphragm Expansion Tank
Taco
$2,967.95CX130-125 Taco Diaphragm 35 Gal Expansion Tank. Tank Volume: 35 Gal, 130 Lit. Taco Series CX Expansion Tanks. Most Taco Expansion Tanks are available with either bladders or diaphragms so that water and air are permanently separated. The Taco...$2,967.95 -
CBX254-125 Taco CBX Vertical Bladder Expansion Tank 67 Gal
Taco
$5,427.95CBX254-125 Taco CBX Vertical Bladder Expansion Tank 67 Gal. Tank Volume, Gal: 67, Liter: 254. *Vertical Installation Only. Taco CBX Expansion Tanks are bladder type tanks that provide permanent separation of air and water. Designed for...$5,427.95 -
CBX170-125 Taco CBX Vertical Bladder Expansion Tank 45 Gal
Taco
$4,781.95CBX170-125 Taco CBX Vertical Bladder Expansion Tank 45 Gal. Tank Volume, Gal: 45, Liter: 170. *Vertical Installation Only. Taco CBX Expansion Tanks are bladder type tanks that provide permanent separation of air and water. Designed for...$4,781.95 -
CBX130-125 Taco CBX Vertical Bladder Expansion Tank 34 Gal
Taco
$4,657.00CBX130-125 Taco CBX Vertical Bladder Expansion Tank 34 Gal. Tank Volume, Gal: 34, Liter: 130. *Vertical Installation Only. Taco CBX Expansion Tanks are bladder type tanks that provide permanent separation of air and water. Designed for...$4,657.00 -
CA140-125 Taco CA Expansion Tank
Taco
$4,351.00CA140-125 Taco CA Expansion Tank. Tank Volume: 37 Gal. 140 Liter. Standard Design Pressure and Temperature: 125 psi @ 240*F Max. Suitable for Vertical or Horizontal Installation. Information: Taco Series CA Expansion Tank Brochure Taco Series...$4,351.00 -
PAX170-150 Taco Bladder Expansion Tank
Taco
$3,861.00PAX170-150 Taco Bladder Expansion Tank. Acceptance Volume: 45 gal, 170 liter. Taco PAX Series bladder type tanks provide permanent separation of air and water. All wetted components are built of FDA-approved materials. Available in 11 models to meet...$3,861.00 -
PAX30-150 Taco Bladder Expansion Tank
Taco
$2,148.10PAX30-150 Taco Bladder Expansion Tank. Acceptance Volume: 5 gal, 19 liter. Taco PAX Series bladder type tanks provide permanent separation of air and water. All wetted components are built of FDA-approved materials. Available in 11 models to meet...$2,148.10 -
116552 Bell & Gossett Series B-400 ASME Pressurized Expansion Tank
Bell & Gossett
$7,341.00116552 Bell & Gossett Series B-400 ASME Pressurized Expansion Tank, Vertical. Tank And Acceptance Volume Gallons: 106 Gallons (400) liters. Repair Parts: 189581 Bell & Gossett Series B-400 Replacement Bladder Only Bell & Gossett...$7,341.00 -
116051 Bell & Gossett Series B-200 ASME Pressurized Expansion Tank
Bell & Gossett
$4,351.95116550 Bell & Gossett Series B-200 ASME Pressurized Expansion Tank, Vertical. Tank And Acceptance Volume Gallons: 53 Gallons (200) liters. Replacement Parts: 189579 Bell & Gossett Series B-200 Replacement Bladder Only Bell & Gossett...$4,351.95 -
112014 Bell & Gossett ATFL1 Airtrol Tank Fittings
Bell & Gossett
$658.95112014 Bell & Gossett ATFL Airtrol Tank Fittings. Connection Size: Tank - 1"F, Boiler - 1"F. Bell & Gossett Airtrol Tank Fittings help to establish proper initial liquid level in the compression tank when filling the hydronic system. They also...$658.95 -
572018-004 Armstrong Diaphragm Expansion Tank 90
Armstrong
$552.95572018-004 Armstrong Diaphragm Expansion Tank 90, non-asme, 13.2 gallon tank, 8.2 acceptance volume. *Please note image is generic. Information: Armstrong NON-ASME Diaphragm Expansion Tank Submittal Sheet Armstrong Series SX Diaphragm Expansion...$552.95 -
1BN322LF Bell & Gossett PT-60V Expansion Tank
Bell & Gossett
$598.951BN322LF Bell & Gossett PT-60V Expansion Tank. The Series PT expansion tank is designed to absorb the forces of expanding water and protect a potable water system from pressure build up. The FDA approved heavy duty butyl diaphragm with...$598.95 -
2220300 Wessels Series NLA-300 Expansion Tank Bladder Only
Wessels
$3,447.952220300 Wessels Series NLA-300 Expansion Tank Bladder Only. Wessels bladder expansion tanks are required in a closed loop heating or chilled water HVAC system to absorb the expanding fluid and limit the pressure within a heating or cooling system. A...$3,447.95 -
BB-50-G Boiler Buddy Buffer Tank 50 Gal Geothermal W/Aquastat
Boiler Buddy
$2,351.95BB-50-G Boiler Buddy Buffer Tank 50 Gal Geothermal With 3 Aquastat Wells. The Boiler Buddy is designed to be used in heating systems with low-mass boilers, geothermal, chilled water applications, or low-mass radiation. Boilers operating at low loads will...$2,351.95 -
572006-303 Armstrong AST-30 ASME Pre-Pressurized Expansion Tank
Armstrong
$1,962.90572006-303 Armstrong AST-30 ASME Pre-Pressurized Hydro-Pneumatic Expansion Tank. Volume Acceptance USGal (10.5) / Tank (15.0). Armstrong Expansion Tanks are designed to reduce tank sizes by up to 80% over standard designs. Expansion tanks use...$1,962.90 -
572006-302 Armstrong AST-20 ASME Pre-Pressurized Expansion Tank
Armstrong
$1,714.50572006-302 Armstrong AST-20 ASME Pre-Pressurized Hydro-Pneumatic Expansion Tank. Volume Acceptance USGal (3.1) / Tank (8.0). Armstrong Expansion Tanks are designed to reduce tank sizes by up to 80% over standard designs. Expansion tanks use...$1,714.50 -
AX-180V Armstrong 572005-105 Pre-charged ASME Expansion Tank
Armstrong
$4,542.00AX-180V Armstrong 572005-105 Pre-charged ASME Expansion Tank. *Please note image is generic. Tank Volume 90.0 gal, (73.0 L). Armstrong Series AX & AX-V Diaphragm Expansion Tanks are designed to reduce tank sizes by up to 80% over standard...$4,542.00 -
116310 Bell & Gossett Series D-280 ASME Expansion Tank
Bell & Gossett
$8,173.00116310 Bell & Gossett Series D-280 ASME Expansion Tank. Tank Volume: 211.0 Gallons (800.0L). Series "D" (ASME) Pressurized Expansion Tanks Vertical. "Not For Potable Water Systems". Bell & Gossett Expansion Tank Information: Bell &...$8,173.00 -
CX300-125 Taco 79 Gal Diaphragm Expansion Tank
Taco
$4,557.95CX300-125 Taco 79 Gal Diaphragm Expansion Tank. Tank Volume: 79 Gal, 300 Lit. Taco Series CX Expansion Tanks. Most Taco Expansion Tanks are available with either bladders or diaphragms so that water and air are permanently separated. The Taco...$4,557.95 -
CBX300-125 Taco CBX Vertical Bladder Expansion Tank 79 Gal
Taco
$5,581.95CBX300-125 Taco CBX Vertical Bladder Expansion Tank 79 Gal. Tank Volume, Gal: 79, Liter: 300. *Vertical Installation Only. Taco CBX Expansion Tanks are bladder type tanks that provide permanent separation of air and water. Designed for...$5,581.95 -
CA300-125 Taco CA Expansion Tank
Taco
$5,861.00CA300-125 Taco CA Expansion Tank. Tank Volume: 79 Gal. 300 Liter. Standard Design Pressure and Temperature: 125 psi @ 240*F Max. Suitable for Vertical or Horizontal Installation. Information: Taco Series CA Expansion Tank Brochure Taco Series...$5,861.00 -
CA215-125 Taco CA Expansion Tank
Taco
$5,351.00CA215-125 Taco CA Expansion Tank. Tank Volume: 57 Gal. 215 Liter. Standard Design Pressure and Temperature: 125 psi @ 240*F Max. Suitable for Vertical or Horizontal Installation. Information: Taco Series CA Expansion Tank Brochure Taco Series...$5,351.00 -
CA90-125 Taco CA Expansion Tank
Taco
$3,865.00CA90-125 Taco CA Expansion Tank. Tank Volume: 23 Gal. 90 Liter. Standard Design Pressure and Temperature: 125 psi @ 240*F Max. Suitable for Vertical or Horizontal Installation. Information: Taco Series CA Expansion Tank Brochure Taco Series CA...$3,865.00 -
573100-007 Armstrong A300-L Expansion Tank
Armstrong
$5,355.95573100-007 Armstrong A300-L Expansion Tank. Tank Volume Gal/L: 80(300). Armstrong Series L Bladder Expansion Tanks. Armstrong Expansion Tanks are designed to reduce tank sizes by up to 80% over standard designs. Expansion tanks use compressed air to...$5,355.95 -
116305 Bell & Gossett Series D-144 ASME Expansion Tank
Bell & Gossett
$4,698.95116305 Bell & Gossett Series D-144 ASME Expansion Tank. Tank Volume: 77.0 Gallons (291.5L). Series "D" (ASME) Pressurized Expansion Tank. "Not For Potable Water Systems". Bell & Gossett Expansion Tank Information: Bell & Gossett...$4,698.95 -
116302 Bell & Gossett Series D-80 ASME Expansion Tank
Bell & Gossett
$3,372.95116302 Bell & Gossett Series D-80 ASME Expansion Tank. Tank Volume: 44.4 Gallons (168.1L). Series "D" (ASME) Pressurized Expansion Tank. "Not For Potable Water Systems". Bell & Gossett Expansion Tank Information: Bell & Gossett...$3,372.95 -
PTA-20V Bell & Gossett 1BN348LF ASME Potable Expansion Tank
Bell & Gossett
$2,403.95PTA-20V Bell & Gossett 1BN348LF ASME Potable Expansion Tank. The Series PTA expansion tank is an ASME constructed vessel designed to absorb the forces of expanding water and protect the domestic water system from pressure build up. PTA-5 through...$2,403.95 -
PTA-12 Bell & Gossett 1BN347LF ASME Potable Expansion Tank
Bell & Gossett
$2,165.95PTA-12 Bell & Gossett 1BN347LF ASME Potable Expansion Tank. The Series PTA expansion tank is an ASME constructed vessel designed to absorb the forces of expanding water and protect the domestic water system from pressure build up. PTA-5 through...$2,165.95 -
116664 Bell & Gossett Compression Tank Model 40
Bell & Gossett
$1,257.00116664 Bell & Gossett Compression Tank Model 40. Capacity Gallons 40. Required 112010 Bell & Gossett Airtrol Tank Fitting ATF-12 Bell & Gossett ASME Compression Tanks Technical Brochure Bell & Gossett ASME Compression Tank...$1,257.00 -
113227 Bell & Gossett TPV-1/2FF Tank Purge Valve
Bell & Gossett
$82.50113227 Bell & Gossett TPV-1/2FF Tank Purge Valve. System Connection: 1/2" Female NPT - Tank Connection: 1/2" Female NPT. The Bell & Gossett Tank Purge Valve (TPV) is a combination full port ball type isolation valve and drain valve used to...$82.50 -
1BN335 Bell & Gossett HFT-160V Expansion Tank
Bell & Gossett
$1,025.951BN335 Bell & Gossett HFT-160V Expansion Tank. Bell & Gossett Non-ASME Expansion Tanks Series HFT Pre-Charged Diaphragm Technical Brochure Bell & Gossett Diaphragm Expansion Tanks ASME And Non-Code Instruction Manual Bell & Gossett...$1,025.95 -
PAX170-150P Taco Bladder Expansion Tank Potable Water
Taco
$4,117.00PAX170-150P Taco Bladder Expansion Tank Potable Water. Tank Volume: 45 gal, 170 liter. Taco PAX Series bladder type tanks provide permanent separation of air and water. All wetted components are built of FDA-approved materials. Available in 11...$4,117.00 -
BB-80-3W Boiler Buddy Buffer Tank 80 Gal W/3 Aquastat Wells
Boiler Buddy
$2,874.95BB-80-3W Boiler Buddy Buffer Tank 80 Gal W/3 Aquastat Wells. The Boiler Buddy is designed to be used in heating systems with low-mass boilers, geothermal, chilled water applications, or low-mass radiation. Boilers operating at low loads will short cycle...$2,874.95 -
572005-102 Armstrong AX-100V Pre-charged ASME Expansion Tank
Armstrong
$3,789.00AX-100V Armstrong Pre-charged ASME Expansion Tank 572005-102. Tank Volume 60.0 gal, (227.1 L). *Please note image is generic. Armstrong Series AX & AX-V Diaphragm Tanks. Armstrong Expansion Tanks are designed to reduce tank sizes by up to...$3,789.00 -
CA450-125 Taco CA Expansion Tank
Taco
$5,581.00CA450-125 Taco CA Expansion Tank. Tank Volume: 119 Gal. 450 Liter. Standard Design Pressure and Temperature: 125 psi @ 240*F Max. Suitable for Vertical or Horizontal Installation. Information: Taco Series CA Expansion Tank Brochure Taco Series...$5,581.00 -
PS135-125 Taco PS Expansion Tank 135 Gal
Taco
$2,445.50PS135-125 Taco PS Expansion Tank 135 Gal. Capacity (Gal) 135. Specifications: Manufactured in Accordance with ASME Section VIII. Maximum working pressure - 125 PSIG (optional 150 PSIG, -150 in Model No.). Maximum Operating Temperature - 375*F. Taco...$2,445.50 -
PS120-125 Taco PS Expansion Tank 120 Gal
Taco
$2,461.95PS120-125 Taco PS Expansion Tank 120 Gal. Capacity (Gal) 120. Specifications: Manufactured in Accordance with ASME Section VIII. Maximum working pressure - 125 PSIG (optional 150 PSIG, -150 in Model No.). Maximum Operating Temperature - 375*F. Taco...$2,461.95