• About Amtrol
  • Company
    Leadership
  • Policies
    • Legal Statement
    • Our Quality Policy
    • Terms and Conditions
  • Certificates
  • AMTROL Warranty
  • Education Center
• Products
  • Well Tanks
    • Well-X-Trol
    • Champion
    • Wel-Flo
    • Pro-Line
    • Value-Well
    • Well-X1
    • Pressure Booster Systems
    • Retention Tanks
    • Reverse Osmosis
  • Plumbing & Heating
    • Indirect Water Heaters
    • BoilerMate
    • HydroMax
    • Premier
    • Thermal Expansion Tanks
    • Hydronic Expansion Tanks
    • Boiler Fill Valves
    • Shock Suppressors
    • Plumbing & Heating Accessories
  • Commercial & Industrial
    • Fire Protection Systems
    • Surge-Trol Surge Suppressors
    • FIRE-X-TROL Tanks
    • Hydronic Expansion
    • Thermal Expansion
    • Well Tanks
    • Shock & Surge Suppressors
    • Air Separator
    • Air Vent and Air Purger
    • Commercial Water Heaters
  • Refrigerant & Chemical Cylinders
    • CoMet® Recovery
    • Refrigerant Recovery
    • Non-Refillable Gas
  • AutoGas Cylinders
• What's New
  • Featured Products
    • Well-X-Trol
    • Therm-X-Trol
    • Extrol
  • Trade Shows/Events
  • Tanks on Tour
• Support
  • List Price Book
  • Sales Rep Tools
  • BoilerMate Warranty Info
  • Installer Programs
    • Amtrol Rewards
• Contact
  • Contact Us
  • Local Sales Rep
  • Warranty Registration
  • Technical Support
  • Employment

THERM-X-TROL® Thermal Expansion Absorbers Thermal expansion occurs as domestic water is heated. Left unchecked, the resulting pressure increase can cause relief valve discharge and other potentially unsafe conditions. Therm-X-Trol® expansion tanks absorb this expanded water, keeping water pressure at a safe level. #1 choice of Professional Installers in USA Most effective way to control Thermal Expansion Stainless steel system connection Molded, polypropylene liner for maximum corrosion resistance NSF 61 approved Broadest line of models to fit any application Meets CA and VT low lead laws 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. Featured on Ask This Old House

ASK THIS OLD HOUSE® is a registered trademark of This Old House Ventures, Inc. Used with permission.