Ariston® Water age

How to determine the date of production/manufacture or age of Ariston^® brand Water Heater Systems.

Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems.

Parent Company: Ariston Thermo USA

Subsidiaries or related brands: HTP; American Standard Water Heaters

The date of production/manufacture or age of Ariston® brand Water Heater equipment can be determined from the serial number located on the rating data plate.

Example serial number styles/formats found:

→Style 1: 360503435081213005509

Legend: Year is RED; Month is GREEN; Day is BLUE

→Style 1: 360503435081213005509

This style is always 21 characters in length. The date codes precede the last 7 digits.

Year of manufacture can be determined by using the 10^th and 11^th digits of the serial number

Calendar day of the year can be determined by using the 12^th thru 14^th digits of the serial number

Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water heating equipment. Users relying on this information do so at their own risk.

Page last updated: 02/11/2025

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