Determining the age of a Stiebel Eltron tankless water heater requires locating the technical identification and serial number data plate affixed directly to the side or front casing of the unit. The serial number typically contains embedded date-coding sequences where specific digits indicate the year and month of manufacture. If deciphering the exact manufacturing code proves difficult, homeowners can contact Stiebel Eltron technical customer support directly, providing the complete serial and model numbers for instant verification.
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