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Amtrol Therm-X-Trol 2.0 Gallon Thermal Expansion Tank


Quick Overview

Amtrol Therm-X-Trol 2.0 Gallon Thermal Expansion Tank - ST-5


Amtrol Therm-X-Trol 2.0 Gallon Thermal Expansion Tank

The Amtrol ST-5 Therm-X-Span® 2-gallon thermal expansion tank provides protection against pressure build up in closed hot water systems while also helping eliminate BTU and water waste. This easy-to-install expansion tank can be used for office buildings, apartments, hospitals and more. Amtrol covers the Therm-X-Trol tanks with a 5-Year Warranty.


  • The Amtrol ST-5 accepts expanded water as system temperature rises and returns hot water to system when demand occurs.
  • For use with water heaters up to 75 gallons in size.
  • Prevents dripping faucets, intermittent toilet fill and pressure relief valve discharge
  • Eliminates wasted water and energy
  • Required by most building codes where backflow preventers are specified.
  • NEW Anti-Microbial liner to help prevent Legionella
  • Insite Indicator to let you know when tank has failed
  • Water Tabulator to mix stagnant water in the tank


     System Connection: Stainless Steel
     Diaphragm: Butyl
     Liner Material: Polypropylene
Tank Volume: 2.0 gallons
Height: 13"
Diameter: 8"
System Connection: 3/4 NPTM
Shipping Weight: 5 lbs
Operating Temperature: 200° F
Working Pressure: 150 PSIG

Amtrol ST-5 Thermal Expansion Tank - 2.0 Gallon

Additional Information

Manufacturer Amtrol
Water Heather Type Tank