A.O. Smith water heaters continue to utilize their proprietary Blue Diamond Glass-Lined coating baked onto the interior surface of all steel storage tanks. This specialized glass lining creates a smooth, inert barrier that prevents corrosive water from coming into direct contact with the underlying steel shell, significantly extending the structural lifespan of the tank. A.O. Smith pioneered and perfected this glass-lining technology over decades of metallurgical research, pairing it with sacrificial anode rods to provide double-layer protection against rust and premature tank failure in aggressive hard water environments.
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