A.O. Smith ProLine water heaters typically last between ten and fifteen years when the system is properly sized, professionally installed, and maintained through regular annual flushing and periodic anode rod inspections. Because ProLine models are engineered exclusively for professional plumbing contractors and wholesale supply houses, they incorporate heavier-gauge commercial steel tanks, advanced core components, and superior corrosion-resistant barriers that extend structural life beyond typical retail-grade alternatives. Adhering to routine maintenance schedules in hard water environments significantly helps the unit reach or exceed its maximum expected operational lifespan.
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