1. Age
Most tank water heaters last 8–12 years. If yours is older, plan for replacement.
2. Rusty water
Discolored hot water can mean a rusting tank.
3. Strange noises
Rumbling or popping sounds suggest sediment buildup.
4. Leaks
Any leak around the tank warrants immediate attention.
5. Not enough hot water
If you're running out faster than before, the unit may be failing.
