How Long Does a Water Heater Really Last?
Typical Lifespan Ranges
Tank water heaters typically last 8-12 years. Tankless units, with proper maintenance including periodic descaling, can last 15-20+ years.
Factors That Shorten Lifespan
Hard water accelerates sediment buildup in tank units and scale buildup in tankless heat exchangers, both of which reduce efficiency and can shorten lifespan if not addressed.
Extreme heat and cold climates can also add stress to a unit, along with lack of regular maintenance like anode rod replacement (tank units) or descaling (tankless units).
Extending Your Unit’s Life
Regular sediment flushing (tank) or descaling (tankless), periodic anode rod inspection, and prompt repair of small issues before they escalate all help a unit reach or exceed its expected lifespan.
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Frequently Asked Questions
How do I find out how old my water heater is?
The manufacture date is typically encoded in the serial number on the manufacturer’s label, often as the first four digits (year and week of manufacture).
Should I replace a water heater before it fails completely?
Once a unit reaches 10-12 years (tank) and shows any warning signs, proactive replacement can prevent a sudden failure and the water damage that often comes with it.
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