Amtrol Therm X Trol Water Heater Expansion Tanks
Product Support

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