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How old is my Dunkirk unit?

Dunkirk is part of ECR International. 3 serial formats sourced across boiler.

Serial number decoder for Dunkirk

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: 160500150

Dunkirk boiler serial numbers in the 2005 to present format encode the year as digits 3-4 (20YY) and the WEEK = digits 1-2 (source: building-center.org).
Example: serial 160500150 decodes to week 16 of 2005.
Dunkirk boiler serial numbers in the 1979 to 2001 format encode the year as letter 2 (table below) and the month as letter 1: A Jan B Feb C Mar D Apr E May F Jun G Jul H Aug K Sep L Oct M Nov N Dec (I and J unused) (source: building-center.org).
Example: serial HT11826 decodes to August 1996.
Dunkirk's official lookup at dunkirk.com returns warranty / registration lookup.

Decoder pages by product

Official lookup: the authority

Open the official Dunkirk 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.

Dunkirk is treated as sharing Utica's format because the source lists it in that family; the corporate relationship itself is an estimate.
The 2003 to present format is documented but not decodable here: year position not parseable from prose: 'letters 1+3 combined: U_A=2003 U_B=2004 U_C=2005 U_D=2006 U_E=2007 U_F=2008 U_G='.
Single 9-character style 160500150: week = digits 1-2, year = digits 3-4 (= Utica style 1).