Both Rheem and A. O. Smith are excellent water heater brands and are the two largest manufacturers in North America, so choosing which is better often comes down to specific model features, availability, and plumber preference rather than a huge quality gap. In terms of build quality, both use glass-lined steel tanks, brass drain valves on premium models, and similar anode rod systems, and both have comparable reliability and lifespan of 8 to 12 years for standard tanks. A. O. Smith is often considered to have a slight edge in premium commercial and high-efficiency residential products and owns several other brands like State, American, and Lochinvar, giving it broad market coverage. Rheem is often praised for innovation in features like the Gladiator series with leak detection and auto shutoff, built-in leak sensors, and its Marathon non-metallic tank that offers lifetime durability. Warranty terms are similar, both offering 6, 9, and 12-year options. Price is competitive, with Rheem sometimes slightly less expensive at retail stores like Home Depot, while A. O. Smith is more common through plumbing supply houses and Lowes. Plumber preference is regional, with some areas dominated by Rheem and others by A. O. Smith, which affects parts availability. Energy efficiency is comparable, with both offering Energy Star models. For most homeowners, either brand will serve well if you buy at least a 9-year warranty model and maintain it properly.
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