Watts B911S-M3 Hot Water Boiler Fill

Amtrak Inc. designed and patented the first Extol diaphragm expansion tank in 1954 to control system pressure and help reduce energy consumption in heating and chilled water systems. Over six decades later, Extol is still the world's leading expansion.

2 gallon capacity (note: larger size is Amtrol EX-30)
NOT for potable water, for use with closed hydronic heating and cooling systems
Factory precharge: 12 psig Max. working pressure: 100 psig Max. operating temperature: 240 degrees F
Watertight reservoir for expanded water
Thick, heavy duty Butyl/EPDM diaphragm for long service life
2 gallon capacity (note: larger size is Amtrol EX-30)
NOT for potable water, for use with closed hydronic heating and cooling systems
Factory precharge: 12 psig Max. working pressure: 100 psig Max. operating temperature: 240 degrees F
Watertight reservoir for expanded water
Thick, heavy duty Butyl/EPDM diaphragm for long service life

Top WaffleMaker Reviews

AMTROL EX-15 15 Extrol Expansion Tank;