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How old is my Ariston unit?

Ariston is part of Ariston Group. 4 serial formats sourced across water heater.

Serial number decoder for Ariston

Serial no.

Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.

Format example: J21-6869

Ariston water heater serial numbers in the era not stated format encode the year as digits 2-3 (20YY) and the month as letter 1 (A=Jan..M=Dec, I skipped) (source: htproducts.com).
Example: serial J21-6869 decodes to September 2021.
Ariston water heater serial numbers in the 1994 to 2011 format encode the year as letter 2 (4th char) (table below) and the month as letter 1 (A=Jan..L=Dec, I=Sep, 12 consecutive letters); day of month as digits 2-3 (source: htproducts.com).
Example: serial I21M28666 decodes to September 2006.
Ariston water heater serial numbers in the 2011 to 2021 format encode the year as digits 5-6 (20YY) after dropping a 2-digit prefix when the serial is 16 digits and the month as digits 1-2, day as digits 3-4; the letter = production line (source: htproducts.com).
Example: serial 112116E2054485 decodes to November 2016.

Decoder pages by product

Official lookup: the authority

Open the official HTP lookup takes serial number; returns warranty / registration lookup; URL verified live

This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.

Ariston is treated as sharing HTP's format because the source lists it in that family; the corporate relationship itself is an estimate.
No official online lookup URL was verified for Ariston.
Two official formats: letter-month + YY (J21-6869, all products except hybrid HPWH) and the 21-char material/factory/YY/DDD/sequence format. ariston.com/en-us is live but has no lookup.