How long does an electric water heater last?

By Dana Whitlock. Updated October 2026.

With no flame under the tank, an electric water heater has one less thing wearing it out. In its 2024 water heater rulemaking, the Department of Energy uses an average life of about 15.1 years for electric storage models, with a sensitivity range of 13.1 to 17.1 years. That is slightly longer than DOE's figure for gas tanks, mostly because no burner or flue heats the bottom of the tank. Older industry charts are more conservative, from 11 years in a 2007 builders' study down to 6 to 12 years on one inspector chart. Plan on roughly 11 to 15 years, sometimes longer. The heating elements and thermostats fail most often, and they are usually cheap to fix. The tank sets the real clock. Once it rusts through, the heater is done no matter how new the elements are.

What wears out

Heating elements

Most residential electric tanks have two elements, one near the top and one near the bottom, that sit directly in the water. Minerals form scale on them, and sediment can bury the lower one. A burned-out element is the classic cause of lukewarm water or water that runs out fast. Elements are replaceable, but testing and swapping them involves the unit's wiring and high-voltage terminals, so it is work for a licensed plumber or electrician.

Thermostats and the high-limit switch

Each element has its own thermostat, and a high-limit safety switch cuts power if the water overheats. These parts wear, and the high-limit can trip again and again when an element or thermostat starts to fail. A tripping high-limit is a messenger. Have a professional find out what it is reporting.

The anode rod

Electric tanks use the same glass-lined steel construction and the same sacrificial anode rod as gas tanks. A.O. Smith notes that the rod's life depends on water chemistry, hot water use and whether a softener is installed, and recommends a yearly check. When the rod is gone, the tank wall corrodes instead.

Sediment and the tank shell

Sediment in an electric tank doesn't overheat the steel the way it does over a gas burner, but it does surround the lower element and shorten its life. Eventually the tank itself corrodes and leaks, and a leaking tank can't be repaired.

Signs it's near the end

• Hot water that runs out much faster than it used to, often an upper or lower element failure.
• Lukewarm water only, even with the thermostat set normally.
• The breaker for the heater tripping more than once.
• Water around the base of the tank or rust on the jacket and fittings.
• Discolored hot water or a metallic taste.
• Hissing or popping from the tank as elements heat through scale.
• A manufacture date more than about 13 to 15 years ago on the serial number.

What helps it last

• Flush or partially drain the tank as the owner's manual directs. A.O. Smith says most tank heaters need it at least once a year, and more often with hard water.
• Ask a plumber to inspect the anode rod during a flush and replace it when it is heavily consumed.
• Set the thermostat around 120 degrees Fahrenheit, which A.O. Smith recommends as a safe default.
• If the breaker trips, reset it once. If it trips again, leave it off and call a professional rather than resetting it repeatedly.
• Watch the floor and the relief valve discharge pipe for drips, and check the tank jacket for rust spots a few times a year.
• Consider a water softener or filter in very hard water areas, since scale is what kills elements.

Repair or replace?

Electric heaters tilt toward repair more often than gas ones, because the common failures (an element or a thermostat) cost little next to a new tank. A dry tank under about 10 years old usually just needs the element or thermostat. The math gets closer as the tank ages. Spread the repair cost over the years the tank is likely to have left, and compare that with the replacement cost above divided by a new heater's expected 13 to 15 years. When the repair costs more per remaining year, replace. For a faster test, a repair that runs past half the replacement price on a tank older than about 10 years points to replacement. Any leak from the tank body means replacement, whatever the age. And if you are replacing anyway, ask about a heat pump water heater, which uses the same electric supply and far less energy.

Common symptoms

• Why does my hot water run out so fast
• Why is my hot water rusty
• Why is my water heater leaking from the bottom
• Why is my water heater not making hot water
• Why won't my water heater pilot stay lit
• Why is my water heater making a popping noise
• Why is my water heater relief valve leaking
• Why does my hot water smell like rotten eggs