Amtrol Therm X Trol Water Heater Expansion Tanks

Thermal expansion occurs as domestic water is heated. Left unchecked, the resulting pressure increase can cause relief valve discharge and other potentially hazardous conditions. Therm-X-Trol® expansion tanks absorb this expanded water, keeping water pressure at a safe level. Water heater manufacturers and plumbing codes require the installation of an expansion control device if a backflow preventor, pressure reducing valve or check valve is installed in the domestic supply line. Therm-X-Trol satisfies all manufacturers' requirements.

Product Features:

  • Antimicrobial liner neutralizes bacteria on contact
  • Patent pending Turbulator™ water diffuser
  • 50 psi precharge - the industry's highest
  • Deep drawn steel domes for 2X the strength of other tanks
  • Thickest diaphragm for extra long life
  • Hoop and groove design for added reliability
  • Stainless steel system connection
  • NSF 61 approved
  • Meets CA and VT low lead standards
  • Made in the USA

 

Installation Manual Selection Guide Literature
Available Models
BRAND ORDER NO. DESCRIPTION PHOTO
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Amtrol ST-12 Therm-X-Trol Exp Tank (Potable Water Heaters Only) - 141N43 High Gloss Tan - Volume: 4.4 Login
Amtrol ST-12-C (150) Therm-X-Trol Expansion Tank - Diameter: 12-12 - PSI: 150 - Volume: 5 Login
Amtrol ST-12-C (175) Therm-X-Trol Expansion Tank - Diameter: 12-12 - PSI: 175 - Volume: 5 Login
Amtrol ST-12-C (250) Therm-X-Trol Expansion Tank - Diameter: 12-12 - PSI: 250 - Volume: 5 Login
Amtrol ST-12-C (300) Therm-X-Trol Expansion Tank - Diameter: 12-12 - PSI: 300 - Volume: 5 Login
Amtrol ST-20V-C (150) Therm-X-Trol Expansion Tank - Diameter: 12-19 - PSI: 150 - Volume: 8 Login
Amtrol ST-20V-C (175) Therm-X-Trol Expansion Tank - Diameter: 12-19 - PSI: 175 - Volume: 8 Login
Amtrol ST-20V-C (250) Therm-X-Trol Expansion Tank - Diameter: 12-19 - PSI: 250 - Volume: 8 Login
Amtrol ST-20V-C (300) Therm-X-Trol Expansion Tank - Diameter: 12-19 - PSI: 300 - Volume: 8 Login
Amtrol ST-25V Therm-X-Trol Exp Tank (Potable Water Heaters Only) - 143N164 TAN - Volume: 10.3 Login
Amtrol ST-30V Therm-X-Trol Exp Tank (Potable Water Heaters Only) - 143N273 TAN - Volume: 14 Login
Amtrol ST-30V-C (150) Therm-X-Trol Expansion Tank - Diameter: 16-19 - PSI: 150 - Volume: 14 Login
Amtrol ST-30V-C (175) Therm-X-Trol Expansion Tank - Diameter: 16-19 - PSI: 175 - Volume: 14 Login
Amtrol ST-30V-C (250) Therm-X-Trol Expansion Tank - Diameter: 16-19 - PSI: 250 - Volume: 14 Login
Amtrol ST-30V-C (300) Therm-X-Trol Expansion Tank - Diameter: 16-19 - PSI: 300 - Volume: 14 Login
Amtrol ST-5 Therm-X-Trol Exp Tank (Potable Water Heaters Only) - 140N43 High Gloss Tan - Volume: 2 Login
Amtrol ST-5-C (150) Therm-X-Trol Expansion Tank - Diameter: 10-10 - PSI: 150 - Volume: 2 Login
Amtrol ST-5-C (175) Therm-X-Trol Expansion Tank - Diameter: 10-10 - PSI: 175 - Volume: 2 Login
Amtrol ST-5-C (250) Therm-X-Trol Expansion Tank - Diameter: 10-10 - PSI: 250 - Volume: 2 Login
Amtrol ST-5-C (300) Therm-X-Trol Expansion Tank - Diameter: 10-10 - PSI: 300 - Volume: 2 Login