Systems & Lifespan
Water Heater Lifespan: When to Replace Before It Fails
A failed water heater is rarely just an appliance expense. Tank ruptures are one of the most common sources of interior water damage claims, and the damage typically costs many times the replacement unit.
How long they last
- Conventional tank (gas): 8–12 years
- Conventional tank (electric): 10–15 years
- Tankless: 20+ years
- Heat pump water heater: 13–15 years
Warning signs
Any of these on a unit past eight years should trigger a replacement quote.
- Rusty or metallic-tasting hot water
- Rumbling or popping from sediment buildup
- Moisture or corrosion at the base
- Inconsistent temperature or shorter hot water duration
- Any weeping at the temperature and pressure relief valve
Maintenance that adds years
Flush the tank annually to remove sediment, and inspect the sacrificial anode rod every three years. Replacing a $30 anode rod on schedule can add five years to a tank's life — it is the highest-return maintenance task in the mechanical room.
Reduce the downside
Install a drain pan with a routed drain line and a leak sensor tied to an automatic shutoff valve. On a luxury property with finished space below the unit, this is inexpensive insurance against a five-figure loss.
Frequently asked questions
How long does a water heater last?
Eight to twelve years for a gas tank, ten to fifteen for electric, and twenty or more for a well-maintained tankless unit.
Should I replace a water heater before it leaks?
Yes. Proactive replacement around year ten costs a fraction of the water damage that follows a tank rupture.