Water heaters / Ruud

How old is my Ruud water heater?

RuudChange
Ad space (kept empty until an ad network is approved)

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 numberLook for “Serial No.” on the label above the gas valve

Ruud serial formats we can read

Dark = year, orange = month or week.

Month + year after R-family prefix

R0804B10488

August 2004.

Plant A + week/year

A141511869

Week 14, 2015 (around April).

Coverage and sources

Supports the displayed tank-style formats. Check the printed manufacture date first. Tankless and other plant-prefix layouts are outside this decoder’s coverage.

References checked 2026-10-26.

Independent reference tool, unaffiliated with Ruud. Sources & method