Weil-McLain – How to determine the age or manufacture date
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
This page was last updated: 9 January 2010.
Weil-McLain uses CP numbers to identify the date of manufacture of its HVAC units. Use the Chart below to determine the year of manufacture.
To contact Weil-McLain call - (219) 879-5661 or (866) 783-9276 and ask for Technical Services
CP Number Year Chart - Locate where your CP Number fits within the chart. The first column will give you the approximate manufacture year. Thanks go out to John Gutierrez of HOMETECH NJ Inspection Services, LLC for this information. Please visit John's site at www.homeinspectorsofnewjersey.com
| YEAR | CP Beginning # | CP Ending # | | YEAR | CP Beginning # | CP Ending # |
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| 1988 | 1414001 | 1681500 | | 2000 | 3810001 | 4055000 |
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| 1989 | 1681501 | 1871500 | | 2001 | 4055001 | 4311000 |
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| 1990 | 1871501 | 2056000 | | 2002 | 4311001 | 4586999 |
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| 1991 | 2056001 | 2217399 | | 2003 | 4587000 | 4807000 |
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| 1992 | 2217400 | 2399999 | | 2004 | 4807001 | 5047000 |
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| 1993 | 2400000 | 2609500 | | 2005 | 5047001 | 5301000 |
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| 1994 | 2609501 | 2815000 | | 2006 | 5301001 | 5454497 |
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| 1995 | 2815001 | 3003000 | | 2007 | 5454498 | 5731063 |
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| 1996 | 3003001 | 3213000 | | 2008 | 5731064 | 5957346 |
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| 1997 | 3213001 | 3441400 | | 2009 | 5957347 | |
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| 1998 | 3441401 | 3621000 | | | | |
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| 1999 | 3621001 | 3810000 | | | | |
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