Upper or lower
An electric tank has two elements and they do not run at the same time. The upper element heats the top of the tank first, then control passes down. That sequence is why the symptoms are so specific:
- Lower element failed — genuinely hot water, but only a fraction of a normal shower before it turns cold
- Upper element failed — little or no usable hot water at all, because the lower element never gets control
- Element shorted to ground — the breaker trips as soon as the heater calls for heat
Why elements burn out
Scale build-up
Mineral scale bakes onto the element sheath. Heat cannot escape into the water, so the element cooks itself. This is the dominant cause in hard-water areas and the reason lower elements fail more often than upper ones.
Dry firing
An element energised while not fully submerged fails within seconds. It happens when a tank is drained for service and the breaker is left on, and it is entirely avoidable.
Sheath corrosion
Over years the sheath itself degrades and eventually admits water to the internal coil, creating the short to ground that trips the breaker.
Age and cycling
Elements have a finite number of heat cycles. On a tank a decade into service, an element failure is a normal end of life rather than a defect.
Replacement done properly
Three things matter and are routinely got wrong. The replacement must match the original wattage and voltage — fitting a higher-wattage element to a circuit not rated for it is a fire risk, and a mismatched pair produces uneven heating. The gasket must seat clean, since debris on the flange face causes a slow seep that shows up days later at the access panel. And the tank must be genuinely full before power is restored, or the new element dry-fires immediately.
Element style matters too. Low-density elements spread the same wattage over a longer sheath and resist scale far better in mineral-heavy water, which is usually the sensible choice locally.
Repeat failures are a signal
An element that fails twice in a couple of years is reporting a condition, not bad luck. Heavy sediment, a thermostat holding the element on too long, or water chemistry are the usual culprits — and flushing the tank is part of the fix.
When the tank is the real problem
Elements thread directly into the tank wall. On a heavily corroded tank the threaded port can be too degraded to seal against a new element, and disturbing it risks turning a repair into a leak. Where that is the case it gets flagged before anything is removed, because the honest option at that point is replacement rather than a repair that may not hold.
Electric tanks are common throughout Wilmington's condo conversions and apartment buildings, including around Riverside, Trolley Square and Prices Corner, where a gas flue was never available. In tight utility closets, clearance in front of the access panel determines whether an element can be withdrawn at all — occasionally the heater has to be pulled forward first.
Related repairs
- Electric water heater repairElement, thermostat, high-limit and wiring faults on 240V tanks.
- Water heater thermostat repairMiscalibrated controls, stuck contacts and tripped high-limit switches.
- Water heater not heatingLukewarm water, short supply and slow recovery on any fuel type.
- Water heater noise repairPopping, rumbling, banging, ticking and screeching — matched to their cause.
Questions we get asked
How do I know which element failed?
By the symptom. Hot water that runs out quickly points at the lower element; water that never gets properly hot points at the upper. Testing both for resistance and for a short to the tank confirms it.
Can a bad element trip my breaker?
Yes. When the sheath fails and the internal coil contacts the tank, it creates a ground fault that trips the breaker whenever the heater calls for heat.
Should both elements be replaced together?
Often worth it. If both are original and one has failed from scale, the other is usually not far behind, and the tank is already drained — so doing both avoids a repeat visit.
Why did my new element fail so quickly?
Usually dry firing during installation, or heavy sediment burying the lower element again. If the tank was not flushed when the element was changed, the same conditions that killed the first one are still present.
Get it looked at
Describe what the heater is doing when you call — the symptom usually narrows the fault before anyone arrives.
(302) 603-9708 Call now for service