Union Energy – How to determine the age or manufacture date

Union Energy®
– How to determine the age or manufacture date


This page was last updated:  25 July 2009


Union Energy

Serial Number format:  2701E15232

(This serial number is from an actual air-conditioning unit transcribed during a home inspection).


Using the first, second, third and fourth digits of the serial number 2701E15232 you will find the week and year of manufacture.  The first and second digits are the week and the third and fourth digits are the year.  This unit was manufactured in the 27th week of 2001. 


Year of manufacture:  2701E15232

Week of manufacture: 2701E15232


Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water heating 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