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The Extrol Hydronic Expansion Tanks are the highest quality expansion tanks in the world. Made right here in the USA, American workers take pride in making the Extrol tanks stand out amongst its competitors.  Amtrol designed these tanks to help reduce energy in heating and chilled water systems, as well as control system pressure. Since being developed in 1954, the Extrol expansion tank is still the world’s leading expansion tank brand due to Amtrol’s standard for quality, reliability, and innovation.
Since thermal expansion happens when domestic water is heated, the pressure increase can cause relief valve discharge and other potentially hazardous conditions. The Therm-X-Trol expansion tank is designed to absorb that expanded water, keeping the water pressure at a safe level. With an industry highest 50 psi precharge and patent pending Turbulator water diffuser, Amtrol’s Therm-X-Trol expansion tank continues to set itself apart from competitors.
The Amtrol Fill-Trol system is a pre-pressurized, diaphragm-type expansion tank that eliminates the need for a separate, automatic, fill valve. The fill-trol tank is fully adjustable up to a maximum working pressure of 100 psi.
Well-X-Trol sets the bar high with the its superior technology and innovative design. Made of high strength steel, this product delivers 150 psi working pressure – 20% higher than competitive well tanks. It also locks the diaphragm, liner, and shell together using its unique design of a hoop ring and groove. Backed by a 7 year warranty, Amtrol continues to be an industry leader and stands behind its products.