Therm-X-Trol®

We Can Take the Pressure™
Amtrol invented the thermal expansion tank to absorb expanded water in closed, hot water systems and protect the water heater. Since the beginning, we’ve kept the pressure on our competitors with features they just can’t match; like our patented Turbulator™, antimicrobial liner, patent-pending InSight™ service indicator cap and 50 PSIG precharge. When your water heater is on the line, we deliver.

  • FEATURES
  • SPECIFICATIONS
  • BROCHURES
  • MANUAL & SUBMITTALS
  • VIDEOS

FEATURES

  • Antimicrobial Liner Neutralizes Bacteria on Contact.
  • Patented Turbulator™ Water Circulation Device.
  • InSight™ Indicator Cap Tank Service Alert.
  • Highest Precharge – 50 PSIG.
  • Strongest Tank Design Featuring Deep Drawn Steel and Multi-Dome Construction.
  • Thickest Diaphragm – Heavy Duty Butyl.
  • Projection Welded Air Stem to Help Eliminate Leaks.
  • Stainless Steel System Connection.
  • In-Line Models Available in 2.0, 3.2 and 4.4 Gallon sizes.
  • Freestanding Models Available in 10.3 through 86 Gallon sizes.
  • Exclusive ST-1 for Tankless Water Heaters.

SPECIFICATIONS

Construction

  • Shell: High Strength Steel
  • Diaphragm: Heavy Duty Butyl NSF/ANSI 61
  • Liner: Antimicrobial
  • System Connection: Stainless Steel
  • Water Circulator: Patented Turbulator™
  • Air Valve: Projection Welded
  • Air Valve Cap: Patent-Pending InSight™ Indicator Cap
    (In-Line Models: ST-5, ST-8, ST-12)
  • Factory Precharge:
    In-Line Models: 50 PSIG (3.5 bar)
    Stand Models: 40 PSIG (2.8 bar)

Performance

  • Max. Operating Temperature: 200º F (93º C)
  • Max. Working Pressure: 150 PSIG (10.3 bar)
  • Warranty:
    ST-1 through ST-25V: 5-Year Limited
    ST-30V through ST-210V: 1-Year Limited

Application

  • For use in closed, potable hot water systems to control pressure build-up and protect the water heater.
  • Accepts expanded water as system temperature rises and returns hot water to system when demand occurs.

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