AMTROL 101-1 EX-15 15 Extrol Expansion Tank



Extrol expansion tanks accept expanded fluid in closed-loop hydronic systems to control pressure buildup, improve comfort and help reduce energy costs. Nearly seven decades after inventing the first diaphragm expansion tank, Amtrol’s lineup now includes specialty models engineered for modern, high efficiency systems. None of it would have been possible without Extrol – The One That Started It All™.

Extrol® In-Line Models

  • 7-Year limited warranty.
  • Suitable for expansion control in most residential closed-loop boiler systems.
  • Patented InSight® indicator cap provides visual check of tank condition.
  • In-line mounting adds convenience and space savings.


  • Strongest Tank Design Featuring Deep Drawn Steel and Multi-Dome Construction.
  • Thickest Diaphragm – Heavy Duty Butyl/EPDM.
  • Projection Welded Air Stem to Help Eliminate Leaks.
  • Patented InSight® Service Indicator Cap.
  • In-Line Models Available in 2.0 through 14.0 Gallons
  • Freestanding Models Available in 14 through 86 Gallons.
  • Combination Packages Include an Air Purger (1″ Model 443 or 1-¼” Model 444) and an Air Vent (Model 700-C).



  • Shell: High Strength Steel
  • Diaphragm: Heavy Duty Butyl/EPDM
  • System Connection: Steel
  • Air Stem: Projection Welded
  • Air Valve Cap: Patented InSight® Indicator Cap (EX-15, EX-30, EX-60)
  • Factory Precharge: 12 PSIG (0.8 bar)


  • Max. Operating Temperature: 240º F (116º C)
  • Max. Working Pressure: 100 PSIG (6.9 bar)
  • Warranty:
    · EX Models: 7-Year Limited
    · SX Models: 1-Year Limited


  • For use in closed, hydronic heating systems to control pressure build-up.
  • Accepts expanded water as system temperature rises and returns it to the system as the temperature drops.