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How old is my WaterFurnace unit?

WaterFurnace is part of NIBE. 3 serial formats sourced across heat pump.

Serial number decoder for WaterFurnace

Serial no.

Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.

Format example: 180100228

WaterFurnace heat pump serial numbers in the 2012 to present format encode the year as digits 1-2 (YY) -> 2018 and the month as digits 4-5 -> Oct (source: building-center.org).
Example: serial 180100228 decodes to October 2018.
WaterFurnace heat pump serial numbers in the 1985 to 2012 format encode the year as letter 1 (table below) and the month as letter 2 (A=Jan..M=Dec, I skipped) -> Sep (source: building-center.org).
Example: serial UJ1087 decodes to September 2004.
WaterFurnace heat pump serial numbers in the before 1984 format encode the year as digits 2-3 (YY) -> 1983 and the month as letter 1 (A=Jan..M=Dec, I skipped) -> Apr (source: building-center.org).
Example: serial D8367019 decodes to April 1983.
WaterFurnace's official lookup at warranty.waterfurnace.com returns warranty / registration lookup.

Decoder pages by product

Official lookup: the authority

Open the official WaterFurnace 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.

Three styles: 2012+ numeric YY?MM..., 1985-2012 letter-year + letter-month (A-F reused for 2010-2015), pre-1985 month letter + YY. warranty.waterfurnace.com = 200 (dealer/owner warranty portal; serial lookup mechanics not confirmed). waterfurnace.com/warranty 404.