Find Your GE Water Heater's Age
The fastest way to date a GE water heater is the serial number on its rating plate. Enter it in the free decoder above and you'll get the manufacture date in seconds — or read on to decode it by hand.
Who Makes GE Water Heaters?
GE doesn't manufacture its own conventional tank water heaters. Since the late 1990s, GE-branded tank water heaters have been built by Rheem Manufacturing Company under an arrangement developed jointly with GE Appliances and The Home Depot, which carried the line exclusively. GE Appliances — acquired by Haier in 2016 — has since moved into making its own heat pump water heaters, but the conventional gas and electric GE tanks found in most homes are Rheem-built. Because of that shared production, GE serial numbers use exactly the same date-code format as Rheem — the decoder above works identically for both brands.
Where to Find the Serial Number
Look for the rating plate (also called the data plate) — a silver or white sticker on the side of the tank, usually in the upper half. It shows the model number, serial number, capacity, and input rating, and on many newer GE units it prints the manufacture date in plain text.
If the sticker is dirty or faded, take a photo and increase the contrast — even a partial serial is often enough.
How the GE Serial Format Works
Modern format (month + year). Ignore the letter prefix — GE serials may start with factory prefixes like G, GE, RH, or similar letter combinations. The first four digits after the prefix are the date: two digits for the month, then two for the year.
Worked example — GE 0908B10488:
- Prefix:
GE(ignore) 09= September (month)08= 2008 (year)- Result: manufactured September 2008
Older format (week + year). Some older serials encode the week of the year instead of the month: the first two digits are the week (01–52), the next two are the year. So a serial starting 1415 means week 14 of 2015.
Why the Age of Your Water Heater Matters
- Lifespan. Tank-style water heaters typically last 8–12 years. Past that window, the risk of tank corrosion and leaks climbs sharply — and a failed tank can release dozens of gallons of water into your home.
- Warranty. GE tank warranties commonly run 6, 9, or 12 years from the manufacture date (not the install date). The serial number tells you whether you're still covered before you pay for a repair.
- Replacement planning. Knowing the exact age lets you replace on your schedule instead of making an emergency decision after a failure.
- Buying or selling a home. Inspectors routinely report water heater age, and a unit near the end of its life often becomes a negotiation point.
Sources
Serial format and manufacturer details verified against the InterNACHI water heater dating chart, the Building Intelligence Center's GE water heater age guide, InspectApedia's GE water heater age and manuals page, Rheem's official guide to reading serial numbers, the Supply House Times report on Rheem making G.E. water heaters, and the Consumer Reports water heater buying guide.