Water Heaters, Furnaces & Air Conditioners
How Old Is My Ruud?
Type the serial number from the rating label on your Ruud water heater, furnace or AC to see when it was made and how much of its typical 10-year life is left.
Try an example:
Where to find the serial number on a Ruud
On a tank water heater, the rating label is on the side of the tank, usually near the gas valve or the upper electrical cover. Look for "SERIAL NO." or "S/N". On an outdoor AC or heat pump, the rating plate is on the side of the cabinet near the copper lines. On a furnace, remove the upper front door; the label is on the inside wall or the door itself.
Tip: in a dark basement or closet, take a photo of the label with your phone's flash on and zoom in on the photo.
How to read a Ruud serial number
Numeric start (month + year)
Used 1970–today
Digits 1-2 are the month (01-12) and digits 3-4 are the year. 1218B12345 = December 2018.
Example: 0516B67890 → May 2016
Letter prefix (e.g. RH, Q, W) + month + year
Used 1970–today · varies between models, confirm with the label date
Skip the leading letters. The next 2 digits are the month and the 2 after are the year. RH0806B17262 = August 2006. Some newer Rheem-built units use week + year here instead, so compare with the MFG. DATE printed on the label when there is one.
Example: RH0806B17262 → August 2006
Common replacement parts for Ruud
Always match the part to the model number on your rating label, and have gas or refrigerant work done by a licensed technician.
- Ruud Rheem SP11526Y Curved Dip Tube AssemblyCheck price on Amazon
- Ruud AS-43224-02 OEM Brass Tank Drain ValveCheck price on Amazon
Cheap ways to avoid water damage
Water leak alarm
Sits on the floor next to the tank and sounds a siren at the first drop of water.
See leak alarms on AmazonWater heater drain pan
Catches small leaks and can be piped to a drain, which buys you time before a tank fails.
See drain pans on Amazon
Common questions about Ruud equipment
Are Ruud and Rheem water heaters identical?
Yes. Ruud is a division of Rheem Manufacturing Company. Both lines are engineered in the same factories and use the identical MMYY date decoder.
How often should I change the anode rod in a Ruud water heater?
Every 3 to 5 years, or every 2 years if you have a water softener installed, which accelerates sacrificial anode rod depletion.
How long does a Ruud water heater, furnace or AC last?
About 10 years on average. Units that get yearly maintenance often last longer; units in hard-water areas, coastal air or unconditioned spaces often fail sooner.
Is the serial number the same as the model number?
No. The model number describes the product line, size and options. The serial number identifies your exact unit and contains the manufacture date. Both are printed on the same rating label.
How accurate is this age estimate?
The date comes from the published serial number formats for each brand. It is the factory date, not the installation date, and some formats repeat every 10 or 20 years. If the label shows a printed MFG. DATE, that date wins.