Amtrol Inc.

AMTROL® products include water system solutions for storage, treatment, heating, expansion and flow control, along with a host of related HVAC products serving the residential, commercial, and industrial markets. Our subsidiaries include AMTROL Alfa, in Portugal, specializing in heating and refrigerant gas cylinders. AMTROL employs 1700 people worldwide.

AMTROL was founded in 1946 on the premise that innovation, quality and service will be rewarded with customer loyalty and support. In 1954, we revolutionized the hydronic industry when we introduced EXTROL®, the world's first pre-pressurized diaphragm expansion tank.  This was followed in 1963 with the invention of the first pre-pressurized well tank and in 1967 with the invention of the refrigerant gas cylinder. AMTROL went on to invent the indirect fired water heater in 1980 and the thermal expansion tank in 1991.