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How old is my Westinghouse Water Heaters unit?

Westinghouse Water Heaters is part of licensed (HTP). 4 serial formats sourced across water heater, tankless water heater.

Serial number decoder for Westinghouse Water Heaters

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: 010419H20000667

Westinghouse Water Heaters water heater serial numbers in the 2011 to 2021 format encode the year as digits 5-6 (20YY) and the month as digits 1-2; digits 3-4 = day of month per HTP official guide (building-center says week) (source: building-center.org).
Example: serial 010419H20000667 decodes to January 2019.
Westinghouse Water Heaters 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.
Westinghouse Water Heaters 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.

The 2011 to 2021 format is only partially confirmed (PARTIAL).
Westinghouse Water Heaters is treated as sharing Westinghouse water heaters's format because the source lists it in that family; the corporate relationship itself is an estimate.
Westinghouse Water Heaters 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 Westinghouse Water Heaters.
Serial 010419H20000667 = HTP 2011-2021 style; building-center labels digits 3-4 'week' but the HTP official guide and the plate's own 1/4/2019 date show it is DAY of month. westinghousewaterheating.com now redirects to westinghouse.com tankless collection.