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A.O. Smith Water Heater Repair Parts
Repair parts are listed in sequential order in the left column below. If you do not know the part
number you need, please find the model number of your unit in the right column.
All AO Smith part numbers were changed in 2016 to a system that begins with 100 and includes nine digits. We have moved old part numbers, including the ten-digit part numbers beginning with 900, to our AO Smith Cross Reference page.