How to read Dunkirk boilers serial numbers
This covers Dunkirk. The serial number is on the rating plate on the outside of the boiler, on the top or the side.
Reading it yourself
Nine digits. The first two are the week of the year and the next two are the year.
Example:
500100433was made in week 50 of 2001.
This is the date the unit was made. It was usually installed soon after, but it can be later. If a serial doesn’t fit any of these patterns, look on the label for a printed manufacture date.
Sources
Checked in October 2026.
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