A tankless water heater lasts significantly longer than a traditional storage tank water heater. Tankless systems typically achieve an operational lifespan of twenty to twenty-five years, whereas conventional storage tanks generally last only eight to twelve years. Tankless units outlast tanks because they heat water strictly on demand, which entirely eliminates the constant water pressure stress and thermal fatigue that corrode inner steel storage tanks over time, provided they are maintained with annual descaling flushes.
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