Determining the age of a Takagi tankless water heater requires locating the technical rating and serial number label affixed to the exterior cabinet of the unit. For most standard Takagi models, the serial number utilizes a date-coding format where the first letter or the initial set of digits indicates the year of manufacture, while subsequent digits denote the month. If decoding the exact sequence proves challenging, homeowners can contact Takagi customer service directly with the complete serial number to instantly verify the exact production date and warranty status.
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