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How old is my Crown unit?

Crown is part of Velocity Boiler Works (Crown Boiler Co.), Burnham Holdings. 2 serial formats sourced across boiler.

Serial number decoder for Crown

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: AI

Crown boiler serial numbers in the 2004 to present format encode the year as Series letter 2 (table below) and the month as Series letter 1 (A=Jan..L=Dec, I=Sep) (source: building-center.org).
Example: serial AI decodes to January 2012.
Crown's official lookup at velocityboilerworks.com returns warranty / registration lookup.

Decoder pages by product

Official lookup: the authority

Open the official Crown 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.

The era not stated format is documented but not decodable here: week/month position not parseable from prose: 'literal'.
Boiler serials (CROWNB000530977) are sequential; the date is in the separate 'Series' field on the rating plate: either a literal date (3/18/2010) or a 2-letter month+year code (AI = Sept 2012). Indirect water heaters use YY-prefixed serials. Warranty search takes email + serial (returns not verified).