How old is my Laars boiler?
Serial number age decoder for Laars boilers: 2 format eras, 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: C00B01803
- Laars boiler serial numbers in the era not stated format encode the year as digits 2-3 (YY; 00 = 2000) and the month as letter 1 (A=Jan..M=Dec, I skipped) (source: building-center.org).
- Example: serial C00B01803 decodes to March 2000.
- Laars boiler serial numbers in the before 1999 format encode the year as digits 1-2 (19YY) and the not encoded (source: building-center.org).
- Example: serial 8408375 decodes to 1984.
- Laars's official lookup at laars.com returns warranty / registration lookup.
Format eras
- before 1999 VERIFIED
#######digits 1-2 (19YY) - era not stated VERIFIED
A##A#####digits 2-3 (YY; 00 = 2000)
How to read the serial
before 1999 formatVERIFIED
Shape ####### · example 8408375 · confidence medium
- Year
- digits 1-2 (19YY)
- Week or month
- not encoded
Example: serial 8408375 decodes to 1984.
era not stated formatVERIFIED
Shape A##A##### · example C00B01803 · confidence high
- Year
- digits 2-3 (YY; 00 = 2000)
- Week or month
- month = letter 1 (A=Jan..M=Dec, I skipped)
- Plant
- letter 4 (unpublished)
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| J | September |
| K | October |
| L | November |
| M | December |
| Plant code | Plant |
|---|---|
| A | Jan |
| B | Feb |
| C | Mar |
| D | Apr |
| E | May |
| F | Jun |
| G | Jul |
| H | Aug |
| J | Sep |
| K | Oct |
| L | Nov |
| M | Dec |
Example: serial C00B01803 decodes to March 2000.
Where the data plate is on a boiler
On the jacket: a plate or sticker on the front or side of the boiler casing, sometimes behind a removable front panel next to the gas valve or control.
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 Boiler at 40 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.
Open the official Laars 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
- 9-char letter-month + YY + letter + 5 digits. Teledyne Laars era also used 7-digit YY##### serials. laars.com/support/warranty is registration only (no lookup).
Sources
- https://www.building-center.org/laars-hvac-age/
- https://www.building-center.org/teledyne-laars-water-heater-age/
- img: Laars-Date-of-Manufacture_Serial-Number-Nomenclature1.png
- img: TELEDYNE-Date-of-Manufacture-Serial-Number-Style-2.jpg
- https://www.laars.com/support/warrantyofficial