Water Heater Age Guide

How Old is My Water Heater?

Locate the serial label on your tank or tankless water heater, then decode it to determine the manufacture date and unit age.

Serial Number Location Guide → How Old is My Plumbing?

Plumbing & Water Heaters

C H S/N LABEL Label Location

Tank Water Heater

Common Spot:
Upper tank body label, just below the top cap.

The label is typically on the front of the upper tank body, designed to face outward. It may wrap around the cylinder — check both the front and side. Gas units sometimes have a second label near the burner access area.

COLD HOT 120° FLOW: ON S/N LABEL – ▲ + Label Location

Tankless Water Heater

Common Spot:
Front face label, sometimes inside front cover.

The label is usually visible on the front face without opening anything. Some brands place a second tag inside the removable front cover. The plate typically includes serial number, BTU rating, and flow rate.

Once you've found the label, decode it to get the manufacture date and age.

Decode Water Heater Serial → Try Smart Lookup →

Brand-Specific Nuances

Samsung
QR codes & barcodes on lower right-side exterior.
LG
High-gloss silver labels on side frames.
Carrier
Year is often encoded in the first 4 serial digits.
Kenmore
Model prefix (e.g. 110.) indicates actual maker.
Whirlpool
Uses large white labels inside doors or lid bases.
Apple
Laser-etched in tiny print on the bottom case.

Tips for Hard-to-Read Labels

The label is faded or dirty. What now?

expand_more
Try using a bright flashlight from a side angle to create shadows in the embossed text. You can also carefully rub a graphite pencil over embossed lettering to make it stand out. For dirty labels, use a damp cloth but avoid harsh cleaners that might dissolve the ink.

Can I find the serial number in the software?

expand_more
Yes, for modern "smart" appliances and electronics. Check the settings menu under "About," "System Information," or "Network Status." On many smart fridges, it's also located in the 'Info' section of the external touchscreen display.

Why do I need the serial number vs just the model?

expand_more
Manufacturers often change internal parts midway through a production year. The serial number identifies the specific "run" or date your unit was made, ensuring you order the exact replacement part that fits your specific build version.