How old is my WeatherKing heat pump?

Serial number age decoder for WeatherKing heat pumps: 4 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• WeatherKing heat pump serial numbers in the era not stated format encode the year as digits 4-5 (YY) and the week as digits 2-3 (source: building-center.org).
• Example: serial W291013412 decodes to week 29 of 2010.
• WeatherKing heat pump serial numbers in the before 1989 format encode the year as digits 2-3 (YY; 19YY, Addison Products era, pre-1990) and the month as digits 4-5 (01-12) (source: building-center.org).
• Example: serial 28607168189 decodes to July 1986.
• WeatherKing's official lookup at rheem.registermyunit.com returns warranty / registration lookup.

Format eras

• 1990 to 1995 VERIFIED
  ############digits 3-4 (YY = 1999)
• before 1989 VERIFIED
  ###########digits 2-3 (YY; 19YY, Addison Products era, pre-1990)
• era not stated VERIFIED
  A#########digits 4-5 (YY)
• era not stated VERIFIED
  #### A#### #####digits 3-4 after the middle factory letter

How to read the serial

1990 to 1995 formatVERIFIED

Shape ############ · example 009920304091 · confidence low

Year

digits 3-4 (YY = 1999)

Week or month

not encoded (building-center gives year only)

before 1989 formatVERIFIED

Shape ########### · example 28607168189 · confidence medium

Year

digits 2-3 (YY; 19YY, Addison Products era, pre-1990)

Week or month

month = digits 4-5 (01-12)

Plant

digit 1 = Addison plant number (table not published)

Example: serial 28607168189 decodes to July 1986.

era not stated formatVERIFIED

Shape A######### · example W291013412 · confidence high

Year

digits 4-5 (YY)

Week or month

week = digits 2-3

Plant

letter 1 (e.g. W)

Example: serial W291013412 decodes to week 29 of 2010.

Listed under Rheem in the source; WeatherKing is named in that format's family and the corporate link is an estimate, not a checked fact.

era not stated formatVERIFIED

Shape #### A#### ##### · example 7351 M2806 16735 / CB5D302F099903346 / OR177 M2807 00097 · confidence high

Year

digits 3-4 after the middle factory letter

Week or month

week = digits 1-2 after the middle factory letter

Plant

middle letter F, M, G, W or N

Example: serial 7351 M2806 16735 decodes to week 28 of 2006.

Listed under Rheem in the source; WeatherKing 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 heat pump

On the outdoor unit, same place as a condenser: a plate on the side or back of the cabinet near the line set. The indoor air handler carries its own plate with its own serial.

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 Heat Pump at 10 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

What we could not confirm

• WeatherKing is treated as sharing Rheem's format because the source lists it in that family; the corporate relationship itself is an estimate.
• The 1990 to 1995 format is documented but not decodable here: example 009920304091 does not decode with the derived engine.
• Registered trademark of Rheem. Residential WeatherKing after 1988 = Rheem-built, Rheem styles 1-4 apply (same_format_as Rheem). Two Addison-era styles added as rules (11-digit pre-1990, 12-digit post-1990 commercial). weatherkingac.com is dead (curl 000); registermyunit brand=weatherking returns 200.

Sources

• https://www.building-center.org/rheem/
• https://www.building-center.org/weatherking-hvac-age/
• img: WeatherKing-HVAC-style-5.jpg (transcribed)
• img: WeatherKing-HVAC-style-6.jpg (transcribed)
• https://rheem.registermyunit.com/en-US/warranty/brand?brand=weatherkingofficial

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