While most major whole-house gas tankless water heater brands—such as Rinnai, Navien, and Bosch—engineer and manufacture their core heat exchangers overseas in specialized facilities located in Japan, South Korea, or Germany, several companies maintain robust North American assembly operations. Furthermore, traditional storage tank giants like A.O. Smith, Rheem, and Bradford White manufacture millions of residential hybrid and tank units inside massive domestic production plants located across Tennessee, Arkansas, Alabama, and Michigan.
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