Recognizing that a tankless water heater has reached the end of its lifespan and requires replacement involves monitoring critical operational failure signs. Major indicators include exceeding the 15 to 20 year expected lifespan, recurring digital error codes that persist even after professional parts replacement, a cracked or leaking internal heat exchanger coil, complete burner ignition failure due to obsolete control boards, and discolored rusty water resulting from advanced internal metal corrosion. Verification: Check the unit installation date and evaluate repair costs against a new equipment investment.
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