How old is my Westinghouse Water Heaters tankless water heater?
Serial number age decoder for Westinghouse Water Heaters tankless water heaters: 1 format era, the decode rule in plain English, transcribed tables, and the official lookup.
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 tankless 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.
Format eras
- 2011 to 2021 PARTIAL
######A########digits 5-6 (20YY)
How to read the serial
2011 to 2021 formatPARTIAL
Shape ######A######## · example 010419H20000667 · confidence medium
- Year
- digits 5-6 (20YY)
- Week or month
- month = digits 1-2; digits 3-4 = day of month per HTP official guide (building-center says week)
Example: serial 010419H20000667 decodes to January 2019.
Listed under Westinghouse water heaters in the source; Westinghouse Water Heaters is named in that format's family and the corporate link is an estimate, not a checked fact.
Where the data plate is on a tankless water heater
On the side or bottom of the wall-hung cabinet, or inside the front cover on the frame.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Instant (on-demand) Water Heater at 10 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.
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.
What we could not confirm
- 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.
- 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.