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A deaerator is a device that is used for the removal of oxygen and other dissolved gases from the feedwater to steam generators. The deaerator is part of the feedwater heating system. Manufacturing of deaerators started in the 1800s. Before 1867, deaerators were used as part of the ice manufacturing purification process. Before 1881, feed water heaters were used for marine applications. Two sister ships Olympic and Titanic (1912) had contact feed heaters on board. In 1934 the US Navy purchased an atomizing deaerator. During the 1920s the feedwater heaters and deaerators designs improved. Deaerators continue to be used today for many applications. In 1899, George M Kleucker received a patent for an improved method of deaerating water. 1921 through 1933, George Gibson, Percy Lyon, and Victor Rohlin of Cochrane received deaerator / degasification patents for bubbling steam through liquid. 1926 Brown Stanley received a patent for reducing oxygen and nitrogen gases (deaeration). 1937 Samuel B Applebaum of Permutit received a water deaerator and purifier patent. Stickle, Cochrane, and Permutit are three of the oldest Deaerator manufacturers in the USA. In 1929, a court case between Elliott Company (no longer in business) and H.S.B.W. Cochrane Corporation allowed both businesses to continue manufacturing deaerators. In 1909 Weir was manufacturing contact feed heaters (for de-aerating) in Europe. By 1937 Permutit was manufacturing deaerators. In 1939, manufacturers Cochrane, Darby, Elliott, Groeschel, Stearns-Rogers, Worthington, and others were competing against each other for business. In 1949 Chicago Heater was formed and became a leading deaerator manufacturer. In 1954, manufacturers Allis-Chalmers, Chicago Heater, Cochrane, Elliott, Graver, Swartwout, Worthington, and others were in business. Deaerators are used in many industries such as Co-generation Plants, Hospital Boiler Rooms, Larger Laundry Facilities, Marine, Oil Fields (such as steam injection), Oil Refineries, Off-Shore Platforms, Paper mills, Power Plant, Prison Boiler Rooms, Steel mills, and many other industries.

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