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How old is my Peerless unit?

Peerless is part of PB Heat. 3 serial formats sourced across boiler.

Serial number decoder for Peerless

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: 339090-200012

Peerless boiler serial numbers in the 2000 to present format encode the year as digits 1-4 after the hyphen (YYYY) and the month as last 2 digits (source: building-center.org).
Example: serial 339090-200012 decodes to December 2000.
Peerless boiler serial numbers in the 1984 to 1999 format encode the year as last 2 digits (19YY) and the month as first 2 digits after the hyphen (source: building-center.org).
Example: serial 123456-1284 decodes to December 1984.
Peerless's official lookup at peerlessboilers.com returns warranty / registration lookup.

Decoder pages by product

Official lookup: the authority

Open the official Peerless 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 before 1983 format is documented but not decodable here: no year decode text.
Date is the suffix after the hyphen: YYYYMM since 2000, MMYY 1984-1999; pre-1984 plain 6-digit serials need Peerless.