GSW® Water Heaters

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

Serial number styles/formats found are:

Style 1: 0331263882 (may have letter prefix such as "S")

Style 2: U1117 F700633

See Also: John Woods Water Heaters  and  AO Smith Water Heaters

John Woods and GSW water heaters were acquired by State Industries/AO Smith in 2006

Style 1:  0331263882

This style may also have a letter prefix such as "S"

Style 2:  U1117  F700633

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