Several major water heater manufacturers produce a substantial volume of their traditional storage tank and hybrid electric models within domestic United States manufacturing facilities. Industry leaders like A.O. Smith, Rheem, and Bradford White operate massive, state-of-the-art production plants in states such as Tennessee, Arkansas, Alabama, and Michigan, where millions of residential units are built annually. Conversely, most specialized whole-house tankless water heater brands—such as Navien, Rinnai, and Stiebel Eltron—manufacture their core heat exchangers overseas in specialized plants located in South Korea, Japan, or Germany, though some maintain U.S. assembly operations.
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