Williamson Thermo-Flo – 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: 8 August 2009
Williamson Thermo-Flo
Manufactured By: Weil-McLain
Weil-McLain used CP numbers to identify the date of manufacture of its HVAC units. The only way I have found to decipher their coding is to call or email Weil-McLain.
Phone: (219) 879-5661 or (866) 783-9276 ask for Technical Services
