How Long Does a Water Heater Last? | Deep Dive Plumbing Maryland
Water Heaters
How Long Does a Water Heater Last?
A traditional tank water heater typically lasts 8–12 years. Tankless water heaters last 15–20 years or more. In Maryland, hard water and acidic well water accelerate sediment buildup and corrosion — often pushing tank heaters to the lower end of that range without annual maintenance.
Lifespan by Type
Tank (Gas)
8–12 years
Most common in Southern Maryland homes
Tank (Electric)
10–15 years
Slightly longer than gas with proper maintenance
Tankless
15–20+ years
Higher upfront cost, much longer lifespan
Signs It's Time to Replace
Unit is over 10 years old
Plan aheadRust-colored or discolored hot water
Replace soonRumbling or popping sounds
Flush or replaceWater pooling around the base
Replace immediatelyInconsistent or insufficient hot water
Inspect nowFrequent repairs in the past 2 years
Replace — repair costs add upHow to Extend Your Water Heater's Life
Flush the tank annually to remove sediment buildup
Inspect and replace the anode rod every 3–5 years
Install a water softener if you have hard well water
Set temperature to 120°F — higher temps accelerate corrosion
Install an expansion tank if you're on a closed plumbing system
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