Water heaters / Navien

How old is my Navien water heater?

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Where to find the serial number

Rating label on the side of a tank water heater
Close-up of a rating label showing the serial numberOn tankless models, check the side or lower edge of the cabinet

Navien serial formats we can read

Dark = year, orange = month or week.

Embedded year/month/day

9545J1152752044

May 2011.

Coverage and sources

Supports the 15-character embedded date layout. X, Y and Z mean October, November and December. Earlier hyphenated layouts are excluded.

References checked 2026-10-26.

Independent reference tool, unaffiliated with Navien. Sources & method