The average lifespan of a traditional residential storage tank water heater ranges between 8 to 12 years for standard tank models, while modern tankless water heaters typically last 15 to 20 years with regular maintenance. Factors that heavily influence longevity include local water hardness (mineral scale buildup), annual tank flushing, replacing sacrificial anode rods, and operating at recommended temperatures. Verification: Check the serial number sticker on your water heater to determine its exact manufacturing date and age.
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