When to replace
When to replace your water heater
A conventional tank water heater typically lasts 8–12 years; tankless units can last longer. Age plus any sign of rust or leaking is the clearest replacement signal.
- Typical lifespan
- 8–12 years
- Replacement cost
- $900–$2,500
Signs it's time to replace
- Rusty or discolored hot water
- Water pooling around the base of the tank
- Rumbling or popping noises from sediment buildup
- The unit is past 10 years old and needs a repair
- Inconsistent or declining hot water supply
Extend its life
Flushing the tank yearly and checking the anode rod can push a water heater toward the high end of its lifespan.
Repair or replace?
When a water heater is aging, the question is whether to keep repairing it or replace it. A useful rule of thumb is the 50% rule: if a repair costs more than half the price of a new unit and the water heater is past the midpoint of its 8–12 year lifespan, replacement usually wins. Frequent repairs and efficiency gains push the same direction.
For the full decision framework, see our guide on whether to repair or replace major home systems.
When to replace water heater: FAQ
How long does water heater last?+
A conventional tank water heater typically lasts 8–12 years; tankless units can last longer. Age plus any sign of rust or leaking is the clearest replacement signal.
What are the signs I need to replace my water heater?+
Common signs include: rusty or discolored hot water; water pooling around the base of the tank; rumbling or popping noises from sediment buildup; the unit is past 10 years old and needs a repair.
Can I extend the life of my water heater?+
Flushing the tank yearly and checking the anode rod can push a water heater toward the high end of its lifespan.
Should I repair or replace my water heater?+
A common guideline is the 50% rule: if a repair costs more than half the price of a new unit and the water heater is past the midpoint of its expected life, replacement usually makes more sense. See our full repair-or-replace framework for the details.