What is a serial number?
A serial number is a number the manufacturer assigns to a complete unit (e.g. boiler, water heater) for identification purposes. When shopping for replacement parts, identifying your unit's serial number will ensure the parts you purchase are compatible with your unit.
How do I find my AO Smith unit's serial number?
The serial number of the unit will be on the name/information plate or sticker on the outside of the boiler or water heater. The information plate is usually rectangular and will likely contain a lot of information or numbers. The serial number usually follows the printed words "Serial Number" or "Serial No."
What if I don't have a serial number?
In order to find the most accurate AO Smith recommended replacement part, we will need the serial number of your unit to access a parts list. We may be able to locate a suitable replacement for AO Smith Water Heaters via model number; however, the construction of a particular model can change over time without the model number changing, thus accurate parts lists are often unique to the serial number of the unit. If you already checked your water heater and are unable to identify the serial or model number you can fill out a part request form with any and all information you do have and a team member will follow-up with you.