Therm-X-Trol ST-8 Thermal Expansion Tank (3.2 Gal Volume)
Brand: Amtrol
Part#: 140N738
Model: ST-8
In Stock
Usually ships: within 1 business days

Amtrol ST-8 is 3.2 gallons In-Line Model of Therm-X-Trol searies expansion tank designed to control pressure build-up in closed, hot water systems. Equipped with the thickest diaphragm that provides extra strength and flexibility. Polypropylene tank liner provides 100% corrosion resistance and complies with NSF International Standard for clean and safe water storage.

Materials of Construction:

  • Shell: Steel;
  • Diaphragm: Butyl;
  • Liner: Polypropylene;
  • System Connection: Stainless Steel.

Technical Specifications:
  • Tank Volume 3.2 Gal (12 Lit)
  • Maximum Acceptance Factor 0.59
  • Maximum Operating Temperature: 200°C (93°C)
  • Maximum Working Pressure: 150 PSIG (10.3 bar)
  • System Connection (NPTM): 3/4"
  • Tank Height x Diameter: 15" x 9" (381 mm x 229 mm)
  • Shipping Weight 7 lb (3 Kg).
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5 years manufacturer's warranty.
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Helpful? Yes 2 No
Verified Purchase
Good sized
I wanted this size as it is just slightly oversized for my needs...50 gal water heater and 60 psi pressure. I was seeing 75 psi avg and excursions up to 120 psi before I put in pressure regulator and expansion tank. Now I only see 60 psi avg and 70 psi peak.
By Verified Buyer on 06/17/2016
Ask a Question
Do you have a wall mount for the Therm-X-Trol ST-8 Thermal Expansion Tank 3.2 Gal?
Helpful? Yes No
Yes. It's part# 598-0210
By PexUniverse Customer Service on 12/12/2016