John Wood®

The date of production/manufacture or age of John Wood® Water Heater(s) can be determined from the serial number.

Serial number styles/formats found are:

Style 1: U0106413635

Style 1: U0928413635


Style 1: U0106413635

John Wood serial numbers contain a lot of information, including when the heater was manufactured. This can be determined by looking at the first four numbers, ignoring any letter that may start the serial number. The first two numbers represent the year the heater was built. If your heater was built before 2008, the next two numbers represent the month. If your heater was built after 2008, the next two numbers represent the week.
For Example
Serial number: U0106413635
This heater was manufactured in June 2001
See FAQ guide from John Wood Website

Style 2: U0928413635

John Wood serial numbers contain a lot of information, including when the heater was manufactured. This can be determined by looking at the first four numbers, ignoring any letter that may start the serial number. The first two numbers represent the year the heater was built. If your heater was built before 2008, the next two numbers represent the month. If your heater was built after 2008, the next two numbers represent the week.
For Example
Serial number: U0928413635
This heater was manufactured in the 28th week (July), 2009.
See FAQ guide from John Wood Website

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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 with your concerns or new submissions. Please include all pertinent information including clear and legible pictures of data/nomenclature plates.