The warranty on an A.O. Smith ProLine water heater typically provides six, eight, or twelve years of coverage on the inner glass-lined steel tank, matching the duration for the corresponding internal component parts. ProLine commercial-grade and residential contractor models feature extended warranty tiers compared to basic retail models because they utilize heavier steel construction and enhanced anode rod configurations. To activate and maintain this warranty protection, homeowners must register their water heater with A.O. Smith shortly after professional installation and ensure the system is operated and maintained under normal household conditions.
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