I found`a list of date of manufacture for furnaces and water heaters that went by the serial number on here at one time, and had it saved to my computer,but lo and behold after computer problems it was gone. Can anyone direct me to it or have a copy saved, I could sure use it again. Thanks for any help provided.
WATER HEATER DATE OF MANUFACTURE
When all else fails… http://inspectapedia.com/heat/Furnace_Water_Heater_Age_Charts.pdf](http://inspectapedia.com/heat/Furnace_Water_Heater_Age_Charts.pdf)
Lochinvar WARR-12(WarrantyExplanation).pdf](http://www.nachi.org/forum/attachment.php?attachmentid=11439&d=1178826473)
AO Smith From A.O. Smith.doc](http://www.nachi.org/forum/attachment.php?attachmentid=11442&d=1178838149)
**State **
American From American.doc](http://www.nachi.org/forum/attachment.php?attachmentid=11441&d=1178837957)
RHEEM/RUUD
After letter–first four numbers of Serial Number (0286=Feb 1986)
**Older RUUD used the last 4 digits of the ser. no.
A O SMITH Letter followed by two numbers (800-A-84-12345=Jan 1984)
BRADFORD-WHITE First letter – Year of manufacture (or 20 years earlier)
A 1984 (64) B 1985 (65) C 1986 (66) D 1987 (67) E 1988 (68) F 1989 (69)
G 1990 (70) H 1991 (71) J 1992 (72) K 1993 (73) L 1994 (74) M 1995 (75)
N 1996 (76) P 1997 (77) S 1998 (78) T 1999 (79) W 2000 (80) X 2001 (81)
Y 2002 (82) Z 2003 (83)
Second letter – Month of manufacture
A Jan - B Feb - C Mar - D Apr - E May - F Jun
G Jul - H Aug - J Sep - K Oct - L Nov - M Dec
________________________________________________________________
G/E colors in serial number GENG050243789765 red is month
blue is year
**STATE ** First letter (L) followed by two numbers = year of manufacture
MOR-FLO First two numbers in serial number.
Thank you Jae!
What I do is if the number doesn’t match with the info I keep with my HVAC stuff I call a local vendor that sells that make. This is something I did often while working for an HVAC company. I keep a list of companies and what they sell. The counter guys are more then willing to help.
Why would you want to document a DOM when the DOI may be a year + later?
Not part of the SOP, and that is the ONLY thing that will CYA.
Just a thought . . .
I’ve inspected so many boilers and furnaces that I can estimate the date by the looks of the shell itself.
When I get to a mechanical, I tell my client that I’m going to guess the date of the mechanical first, then I’ll confirm my guess by looking at the tag.
I’m always within 3-5 years of the guess.