Rheem and Rinnai are entirely separate, independent corporate competitors in the residential and commercial plumbing industry, operating under completely different ownership structures and leadership teams. Rheem is a massive, diversified manufacturer producing a broad spectrum of products including traditional storage tanks, HVAC equipment, and retail tankless models. Rinnai is a specialized global manufacturer focusing primarily on advanced gas appliances, tankless water heating systems, and precision copper heat exchangers. They share no corporate lineage or manufacturing plants.
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