The warranty period for an A.O. Smith water heater typically ranges from six to twelve years on the inner tank, depending heavily on the specific model tier and product series chosen. Basic entry-level retail models usually carry a standard six-year limited warranty on both the tank and key internal parts, whereas mid-tier and professional-grade units—such as the ProLine series—often upgrade to eight or twelve-year tank warranties alongside matching parts coverage. To activate and maintain full warranty protection, homeowners must register their water heater with A.O. Smith shortly after professional installation and ensure the unit is maintained under normal operating conditions.
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