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Rheem / Ruud HVAC

How old is my Ruud furnace?

Enter the serial number from the label. The date comes from Ruud's documented serial rules, not a guess.

Look for “Serial No.” or “S/N” on the label. Spaces and dashes are fine.

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How to read a Ruud furnace serial number

Rheem’s own documents cover Ruud: its water-heater service bulletin is titled “How to Locate and Read Rheem/Ruud/Richmond Serial Numbers”, and Rheem/Ruud installation manuals list Ruud as one of the brands. We decode Ruud heating and cooling equipment and Ruud water heaters, but they use different serial formats, so choose the right equipment type before you decode.

  • Prefix block + plant letter + week + year (1988 onward)

  • Plant letter + week + year (about 2010 onward)

Not decoded yet: Pre-1988 Rheem HVAC formats are not decoded because sources conflict.

Where to find the serial number

Turn the furnace off at its switch, then remove the upper access door (the burner or blower compartment). The rating plate is on the inside wall of the cabinet or on the back of the door.

The plate lists the model number and serial number; many newer plates also print a date of manufacture.

Ruud furnace model numbers

If the brand name isn't visible on the label, the model number can help. Model numbers like these follow the Rheem / Ruud nomenclature:

How long does a furnace last?

A typical furnace lasts about 15–20 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition.

Range from NAHB / Bank of America, Study of Life Expectancy of Home Components (2007, archived copy), Carrier: how long does a furnace last? and Lennox: how long does a furnace last?.

Ruud furnace recalls

From the U.S. Consumer Product Safety Commission, checked 2026-09-29. A decoded result checks your model number against recalls live.

Questions

Is a Ruud water heater dated the same way as a Ruud air conditioner?
No. On Ruud heating and cooling equipment, the four digits after the plant letter are the week and then the year. Ruud water heaters built before 2012 start with the month and then the year (Rheem’s template 1209D01234 is December 2009), while newer ones, from 2012 as each plant switched over, use a plant letter followed by the week and year.
Does a model number starting with R mean the unit is a Rheem?
No. Ruud’s own spec sheets print “R - Ruud” on models such as the RA14AZ and R801C, and a Rheem/Ruud manual says “R = RHEEM/ RUUD (ALL TRADEBRANDS)”. A U at the start, as on the UA16AZ or U96V, is used only by Ruud.
How can I tell a Ruud water heater from a Rheem one by the model number?
On the Professional tank heaters, Rheem and Ruud share the base number and the suffix tells them apart: RU for Ruud (as in PROG50-38N RU60) and RH for Rheem. Ruud tankless models start with RUTG.
How can I tell how old my Ruud furnace is?
Find the serial number on the rating plate and enter it above. We decode it using Ruud's documented serial-number format.
Where is the serial number on a Ruud furnace?
Turn the furnace off at its switch, then remove the upper access door (the burner or blower compartment). The rating plate is on the inside wall of the cabinet or on the back of the door. The plate lists the model number and serial number; many newer plates also print a date of manufacture.
How long does a furnace usually last?
A typical service life is about 15–20 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition.
Do Rheem furnaces use the same serial format?
Yes. Ruud and Rheem use the same serial-number conventions (Rheem / Ruud HVAC), so the same decoding rules apply.
How reliable is the result?
The Rheem / Ruud HVAC rules come from documented sources, but they're in Beta while we check more real-world examples, so results are capped at medium confidence. If a serial doesn't match a documented format, we say so instead of guessing.

Same serial format: Rheem furnace

Other Ruud equipment: air conditioner, heat pump, water heater, tankless water heater

Sources

Rules last reviewed 2026-09-28. These rules are in Beta while we verify more real-world examples, so results are capped at medium confidence.

Manufacture dates are decoded from manufacturer serial-number conventions and available documentation. Serial formats can change. Verify critical equipment information with the manufacturer when necessary.