How old is my John Wood unit?
John Wood is part of A.O. Smith Corp. 11 serial formats sourced across water heater.
Serial number decoder for John Wood
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: 1210A002243
- John Wood water heater serial numbers in the 2008 to present format encode the year as digits 1-2 (YY) after optional leading S and the week as digits 3-4 (source: building-center.org).
- Example: serial 1210A002243 decodes to week 10 of 2012.
- John Wood water heater serial numbers in the before 2007 format encode the year as digits 1-2 after the letter (YY) and the month as digits 3-4 (source: johnwoodwaterheaters.com).
- Example: serial U0106413635 decodes to June 2001.
- John Wood water heater serial numbers in the 2008 to present format encode the year as digits 1-2 after the letter (20YY) and the week as digits 3-4 (source: johnwoodwaterheaters.com).
- Example: serial U0928413635 decodes to week 28 of 2009.
Decoder pages by product
Format eras
- before 2010 VERIFIED
A##A######Water Heater - 2008 to present VERIFIED
####A######Water Heater, Heat Pump Water Heater, Tankless Water Heater - 2008 to present VERIFIED
A##########Water Heater - 2008 to present VERIFIED
A#### A######Water Heater - 2008 to present VERIFIED
#############Water Heater - before 2008 VERIFIED
AA##A######Water Heater - before 2007 VERIFIED
A##########Water Heater - before 2007 VERIFIED
##### #####Water Heater - before 2005 VERIFIED
######-####Water Heater - before 2005 VERIFIED
####-######Water Heater - 1970 to 1979 VERIFIED
A##-A-##-######Water Heater
Official lookup
No online serial lookup was found for John Wood 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
- No official online lookup URL was verified for John Wood.
- johnwoodwaterheaters.com/faqs/ (200) has the official decode: 'first two numbers = year; before 2008 next two = month, after 2008 next two = week; ignore any leading letter'.
Sources
- https://www.building-center.org/a-o-smith/
- https://johnwoodwaterheaters.com/faqs/official
- https://www.building-center.org/john-wood-water-heater-age/
- https://www.building-center.org/gsw-water-heater-age/
- https://gsw-wh.com/faq/official
- img: GSW-style-2.jpg
- https://www.building-center.org/american-water-heater-age/
- https://www.building-center.org/whirlpool-water-heater-age/
- https://www.building-center.org/u-s-craftmaster-water-heater-age/
- https://www.building-center.org/craftmaster-water-heater-age/