The warranty period for an A.O. Smith water heater typically spans from six to twelve years on the inner storage tank, depending on the specific model tier and product series chosen. Basic retail-grade units usually carry a standard six-year limited warranty on both the tank and key internal parts, whereas professional-grade models—such as the ProLine series—often upgrade to eight or twelve-year tank coverage alongside matching parts warranties. To validate 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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