Traditional storage tank water heaters manufactured by major American brands typically last between eight and twelve years, assuming the unit is properly sized, professionally installed, and maintained with regular annual flushing and periodic anode rod inspections. For high-efficiency tankless systems or commercial-grade contractor units, the operational lifespan can extend significantly further, frequently reaching twenty years or more. Proactively managing local water hardness and replacing sacrificial anode rods are the most critical factors in helping these units reach their maximum functional window.
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