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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®, patent pending antimicrobial liner, patented InSight® service indicator cap and 50 PSIG precharge. 

When your water heater is on the line, we deliver.
Features
  • Patent Pending Antimicrobial Liner Neutralizes Bacteria on Contact.
  • Patented Turbulator® Water Circulation Device.
  • Patented 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

Brand

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

  • Patented InSight® Indicator Cap (In-Line Models: ST-5, ST-12)

Factory Precharge

  • In-Line Models: 50 psig (3.5 bar)
  • 40 psig (2.8 bar)

Maximum Operating Temperature

  • 200° F (93° C)

Maximum Working Pressure

  • 150 psig (10.3 bar)

Warranty

  • ST-1 through ST-12: 7-Year Limited
  • ST-25V through ST-210V: 1-Year Limited

Documentation

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