Weil-McLain – How to determine the age or manufacture date

Russell Inspection Services - New Hampshire
Weil-McLain ®
– How to determine the age or manufacture date


This page was last updated:  15 Oct. 2012.


Weil-McLain uses CP numbers to identify the date of manufacture of its Boiler units. The CP #'s are commonly found on a separate tag or sticker apart from the typical data tag. 

We have included an abbreviated chart listing CP #'s from 1988 through 2009 (see below) for your convenience.

Weil-McLain also has a CP # Look-up tool available on their website.

If you still require further assistance in determining age or manufacture date, contact Weil-McLain at - (219) 879-6561 or (866) 783-9276 and ask for Technical Services


Style 1: CP2530051


 Weil-McLain Age CP number 


CP Number Year Chart - Locate where your CP Number fits consecutively within the chart.  The first column will indicate the approximate manufacture year for that CP number range. 

weil-mclain cp chart


Thanks go out to John Gutierrez of HOMETECH NJ Inspection Services, LLC for the above referenced chart.  Please visit John's site at www.homeinspectorsofnewjersey.com


Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of HVAC equipment.  Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen.  For this reason if you find during your research that we may have erred please contact us.  In addition perhaps you have come across a brand, model or serial number format that we have not addressed.  Email us information or pictures of data/nomenclature plates of the unit and we will attempt to assist you in your determinations.  Email