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Boiler System Expansion Tanks
Extrol®. First In Expansion Control.
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Amtrol Inc. designed and patented the first Extrol® diaphragm expansion tank
in 1954 to control system pressure and help reduce energy consumption
in heating and chilled water systems. Over six decades later, Extrol is
still the world’s leading expansion tank brand, setting the standard
for quality, reliability and innovation.
All Extrol tanks are made in the USA at our ISO registered
facilities by American workers dedicated to producing the
highest quality expansion tanks in the world.
American Tube Products
founded in West Warwick,
2
Rhode Island
1946
Amtrol’s patent for the
rst diaphragm tank was
issued over 60 years ago.
Built current
Invented the
pre-pressurized
well tank
Rhode Island
manufacturing
facility
Invented the
indirect-red
Hot Water Maker
Opened the
®
Amtrol Education
Center
1963 1972 1980 1988 1992
1954 1967 1975 1986 1991
Invented the
diaphragm
expansion tank
Invented the
refrigerant
gas cylinder
Entered the
commercial
products business
Invented the
top coil indirect
Hot Water Maker
®
Invented the
expansion tank
registered ISO 9001
thermal
AMTROL
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The One That Started It All.
Acquired
ALFA Cylinder
Manufacturing
in Portugal
1997
The complete line of Extrol tanks includes inline, oor-standing, air
elimination packages and special application models.
Invented the
composite metal
LP tank
2005
2003
AMTROL registered
ISO 9001:2000
®
Launched
Amtrol Rewards
2007
Introduced
XLite
cylinder
™
AMTROL registered
ISO 9001:2008
2009
Tanks on Tour™
mobile education center
hits the road
2010
Launched
Next Generation
Well-X-Trol
20 millionth
well tank shipped
Introduced ASME for
propane vehicles
2014
2012
Launched
®
HydroMax®
Hot Water Makers
2016
Amtrol
70th Anniversary
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