The average lifespan of an A.O. Smith water heater typically ranges from ten to fifteen years, depending on several factors such as the type of water heater, maintenance practices, water quality, and local water conditions. For example, traditional tank-style water heaters often last about ten to twelve years, while tankless models can extend that lifespan to fifteen years or more when properly maintained. Regular maintenance, including flushing the tank, checking for leaks, and inspecting the anode rod, can significantly enhance the longevity of the water heater. Additionally, high mineral content in the water or extreme temperature fluctuations may impact the lifespan. A.O. Smith provides guidance on the care and upkeep of their products, which can be helpful in maximizing their durability. For specific information on maintenance tips, one might consider checking the official A.O. Smith website, where more detailed resources may be available.