Symptoms
- Unit is approaching or past its typical 8–12 year lifespan
- Repairs have become more frequent
- Rust-colored water or visible tank corrosion
- Rumbling noise despite flushing, suggesting heavy internal sediment or wear
Likely causes
- CommonTank has reached or exceeded typical service lifeMost tank water heaters last 8–12 years; the manufacture date is usually coded into the serial number.
- CommonVisible rust or corrosion on the tank bodyOnce the tank itself is rusting, it's generally not repairable.
- PossibleRepeated need for the same or different repairsA pattern of recurring issues often signals broader wear rather than one fixable fault.
- PossibleRising energy bills tied to declining efficiencySediment and aging components make older units work harder for the same output.
What to do
- Find the manufacture date, often encoded in the first few digits of the serial number on the rating plate, and check it against your unit's expected lifespan.
- Inspect the tank exterior and base for rust, especially near seams and the bottom.
- Review how many repairs you've needed in the past couple of years and their combined cost.
- Compare the cost of another repair to the cost of a new unit, factoring in the age of the current one.
- Consider whether your household's hot water needs have changed enough to warrant a different size or type (like tankless) at replacement time.
- If you decide to replace proactively, doing so before a failure avoids the water damage risk of waiting for a full tank leak.
Tools and parts
- None required for the assessment
Replacement tank or tankless water heaterSearch: “water heater replacement gas or electric”
When to call a pro
A plumber can give you a firm assessment of remaining life and recommend the right size and type of replacement for your household.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.