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Taco Plain Steel Expansion Tanks

Plain steel expansion tanks are non-bladder pressure vessels designed to absorb thermal expansion in closed-loop hydronic heating and cooling systems. Their ASME Section VIII construction, broad size range, and optional saddle support make them suitable for applications where system volume control, stable operating pressure, and dependable expansion management are important to reliable long-term mechanical system performance.

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Taco Plain Steel Expansion Tanks
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Taco PS120-125, PS Series Plain Steel Expansion Tank 120 Gal 125PSI
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Taco PS120-125, PS Series Plain Steel Expansion Tank 120 Gal 125PSI
$2,460.95 $5,350.00
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Taco PS080-125, PS Series Plain Steel Expansion Tank 80 Gal 125PSI
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Taco PS080-125, PS Series Plain Steel Expansion Tank 80 Gal 125PSI
$2,589.95 $4,280.00
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Taco PS240-125R, 240 GAL, 125 psi PS Expansion Tank
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Taco PS240-125R, 240 GAL, 125 psi PS Expansion Tank
$4,957.95 $11,530.00
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Taco PS220-150, 220 GAL, 150 psi PS Expansion Tank
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Taco PS220-150, 220 GAL, 150 psi PS Expansion Tank
$5,267.95 $12,250.00
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Taco PS180-125R, 180 GAL, 125 psi PS Expansion Tank
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Taco PS180-125R, 180 GAL, 125 psi PS Expansion Tank
$3,702.95 $8,610.00
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Taco PS135-150, 135 GAL, 150 psi PS Expansion Tank
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Taco PS135-150, 135 GAL, 150 psi PS Expansion Tank
$3,201.95 $6,960.00
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Taco PS135-125R, 135 GAL, 125 psi PS Expansion Tank
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Taco PS135-125R, 135 GAL, 125 psi PS Expansion Tank
$2,787.95 $6,060.00
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Taco PS120-125R, 120 GAL, 125 psi PS Expansion Tank
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Taco PS120-125R, 120 GAL, 125 psi PS Expansion Tank
$2,626.95 $5,710.00
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Taco PS100-150, 100 GAL, 150 psi PS Expansion Tank
Taco
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Taco PS100-150, 100 GAL, 150 psi PS Expansion Tank
$3,860.95 $6,380.00
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Taco PS080-150, 80 GAL, 150 psi PS Expansion Tank
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Taco PS080-150, 80 GAL, 150 psi PS Expansion Tank
$2,152.95 $4,680.00
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Taco PS080-125R, 80 GAL, 125 psi PS Expansion Tank
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Taco PS080-125R, 80 GAL, 125 psi PS Expansion Tank
$2,134.95 $4,640.00
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Taco ps060-150, 60 GAL, 150 psi PS Expansion Tank
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Taco ps060-150, 60 GAL, 150 psi PS Expansion Tank
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Taco PS060-125R, 60 GAL, 125 psi PS Expansion Tank
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Taco PS060-125R, 60 GAL, 125 psi PS Expansion Tank
$2,541.95 $4,200.00
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Taco PS040-150, 40 gal 150 psi PS Expansion Tank
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Taco PS040-150, 40 gal 150 psi PS Expansion Tank
$1,697.95 $3,690.00
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Taco PS030-250, 30 GAL, 250 psi PS Expansion Tank
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Taco PS030-250, 30 GAL, 250 psi PS Expansion Tank
$2,962.95 $6,440.00
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Taco PS030-150, 30 GAL, 150 psi PS Expansion Tank
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Taco PS030-150, 30 GAL, 150 psi PS Expansion Tank
$1,471.95 $3,200.00
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Taco PS030-125R, 30 GAL, 125 psi PS Expansion Tank
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Taco PS030-125R, 30 GAL, 125 psi PS Expansion Tank
$1,499.95 $3,260.00
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Taco PS015-150, 15 GAL, 150 psi PS Expansion Tank
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Taco PS015-150, 15 GAL, 150 psi PS Expansion Tank
$1,329.95 $2,890.00
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Taco PS015-125R, 15 GAL, 125 psi PS Expansion Tank
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Taco PS015-125R, 15 GAL, 125 psi PS Expansion Tank
$1,700.95 $2,810.00
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Taco PS515-125, PS Series Plain Steel Expansion Tank 515 Gal 125PSI
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Taco PS515-125, PS Series Plain Steel Expansion Tank 515 Gal 125PSI
$8,737.95 $20,320.00
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Taco PS030-125, PS Series Plain Steel Expansion Tank 30 Gal 125PSI
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Taco PS030-125, PS Series Plain Steel Expansion Tank 30 Gal 125PSI
$1,338.95 $2,910.00
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Taco PS240-125, PS Series Plain Steel Expansion Tank 240 Gal 125PSI
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Taco PS240-125, PS Series Plain Steel Expansion Tank 240 Gal 125PSI
$4,738.95 $11,020.00
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Taco PS400-125, PS Series Plain Steel Expansion Tank 400 Gal 125PSI
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Taco PS400-125, PS Series Plain Steel Expansion Tank 400 Gal 125PSI
$7,082.95 $16,470.00
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Taco PS300-125, PS Series Plain Steel Expansion Tank 300 Gal 125PSI
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Taco PS300-125, PS Series Plain Steel Expansion Tank 300 Gal 125PSI
$5,770.95 $13,420.00
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844-448-0880

Documentation & Resources

From the Atoms & Bits Blog

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Taco Expansion Tanks

Taco Expansion Tanks: A Technical Guide to the PAX, CA, CX, and CBX Series

Published: Mar 19, 2026By: Lucas Gasparotto

Discover why the Taco expansion tanks models are a good alternative for commercial and domestic potable water systems. This guide covers the purpos...
Bladder Tanks vs. Diaphragm Tanks

Bladder Tanks vs. Diaphragm Tanks

Updated on: Jul 16, 2026By: 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...
Taco Air Separators: An Essential Overview and Guide

Taco Air Separators: An Essential Overview and Guide

Published: May 31, 2023By: Laura Eck

Taco Air Separators expel air from the water or coolant in heating and cooling systems, safeguarding system components from potential oxygen-induce...
Taco 00 Series Pumps

Taco 00 Series Circulator Pumps: Models, Specifications, and Selection Guide

Published: Jan 22, 2026By: Lucas Gasparotto

Explore the Taco 00 Series circulator pump family, including model flow and head ranges, differences between common circulators such as the 007, 00...
Taco FI Series End Suction Pumps: A Product Guide

Taco FI Series End Suction Pumps: A Product Guide

Published: Jun 19, 2026By: Lucas Gasparotto

Taco FI Series pumps are commercial, base-mounted, end-suction pumps designed for water supply applications. This guide covers key FI Series featur...
Taco Pump Motors - Overview

Taco Pump Motors - Overview

Published: May 14, 2026By: Lucas Gasparotto

Learn how a Taco circulator pump motor works and are designed across major Taco product lines. Also, if you are looking for technical insights, thi...
Taco 110-120

Taco 110-120 Series Pumps: Models, Parts and Service Guide

Published: Apr 16, 2026By: Lucas Gasparotto

A practical guide to the Taco 110-120 Series inline circulator - model variants, internal construction, service components, common failure modes, f...
Taco 2400

Why the Taco 2400 is a Great Circulator for Commercial Hydronic Loops

Published: Feb 19, 2026By: Lucas Gasparotto

The Taco 2400 is a commercial-grade circulator pump designed for hydronic systems. It is commonly used in general commercial water systems. This ar...

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