How old is my Lochinvar unit?
Lochinvar is part of A.O. Smith Corp. 8 serial formats sourced across water heater.
Serial number decoder for Lochinvar
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: KJ-1000130
- Lochinvar water heater serial numbers in the 1979 to 2011 format encode the year as letter 1, Bradford White 20-year cycle (K=1993, A=2004 ... J=2012) and the month as letter 2 (A=Jan..M=Dec, I skipped) (source: building-center.org).
- Example: serial KJ-1000130 decodes to September 1993.
- Lochinvar water heater serial numbers in the 2011 to present format encode the year as digits 1-2 (20YY) and the week as digits 3-4 (source: building-center.org).
- Example: serial 1142N012345 decodes to week 42 of 2011.
- Lochinvar water heater serial numbers in the 1978 to present format encode the year as digits 1-2 after the letter (YY) and the month as letter 1 (A=Jan..M=Dec, I skipped) (source: building-center.org).
- Example: serial J-930001 decodes to September 1993.
Decoder pages by product
Format eras
- 2011 to present VERIFIED
####A######Water Heater, Boiler - 1984 to present VERIFIED
########Water Heater, Boiler - 1979 to 2011 VERIFIED
AA-#######Water Heater, Boiler - 1978 to present VERIFIED
A-######Water Heater, Boiler - 1978 to present VERIFIED
A##A########Water Heater, Boiler - 1974 to 1997 VERIFIED
A##-####AWater Heater, Boiler - 1968 to 1981 VERIFIED
#A###Water Heater, Boiler - 1965 to 1986 VERIFIED
A#####Water Heater, Boiler
Official lookup
No online serial lookup was found for Lochinvar in our research. The manufacturer's customer service line, the installer's invoice, or a printed date on the plate are the remaining authorities.
What we could not confirm
- The 1974 to 1997 format is documented but not decodable here: letter-year rule without a transcribed table.
- No official online lookup URL was verified for Lochinvar.
- 9 styles, several outsourced (style 1 = Bradford White letter scheme; style 2 = AO Smith YYWW). Charts on building-center were copied from lochinvar.com/_linefiles/WARR-15.pdf (now 404). No online age/warranty lookup found (lochinvar.com/warranty 404).
Sources
- https://www.building-center.org/lochinvar-hvac-age/
- img: Lochinvar-Style-1_Serial-Number.png (from Lochinvar WARR-15.pdf)
- img: Lochinvar-Style-3_Serial-Number_slide-1.png
- img: Lochinvar-Style-5_Serial-Number.png
- img: Lochinvar-Style-7_Serial-Number.png