Amtrol ST-12 Thermal Expansion Tank

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: Patented 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-12: 7-Year Limited
  ST-25V 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.

Sizing Chart