What each symptom usually means
The top element heats the upper part of the tank first, and the bottom element heats the rest. Symptoms point to which part has failed.
| Symptom | Likely cause | Next step |
|---|---|---|
| No hot water at all | Upper element, upper thermostat or tripped high-limit reset | Check the breaker, then the reset button. |
| Lukewarm water | Failed lower element or a bad lower thermostat | Test the lower element. |
| Hot water runs out fast | Lower element dead, so only the top third heats | Test the lower element, then check for sediment. |
| Breaker trips repeatedly | Element shorted to the tank or damaged wiring | Power off and call. |
| Water too hot | Stuck thermostat | Lower the setting and call if it persists. |
Safe diagnosis, step by step
- Turn off the breakerSwitch off the double-pole breaker that feeds the water heater and leave a note on the panel. Do not rely on the thermostat setting, because the wires stay live.
- Prove the power is offRemove the access panel and insulation, then use a non-contact voltage tester or a meter on the terminals to confirm there is no power. Never touch a wire until a tester agrees.
- Disconnect and testRemove one wire from the element terminal, set a meter to ohms and touch the two screw terminals. A reading near zero or no reading at all means the element is open or shorted. A working element reads a low, steady number.
- Test for a short to the tankWith one probe on a terminal and the other on the metal tank, you should see no reading. A reading means the element is grounded and will trip the breaker.
- Replace and refill before powerA new element must match the voltage and wattage on the nameplate. Fill the tank completely and open a hot tap until water flows steadily before you restore power. A dry element burns out in seconds.
When to stop and call a plumber
Testing an element is simple, but the work sits next to a 240-volt supply and a tank full of water. These situations call for a licensed plumber, not a second attempt.
Scorched or melted wires, water in the electrical compartment, a breaker that trips again after a new element, a rusted or leaking tank, an element that will not unscrew, or any doubt about the power being off. Leave the breaker off and call (336) 453-0472.
Lukewarm water from an electric tank often traces to one element, and call (336) 453-0472 will confirm it.
Upper element versus lower element
The two elements do not work at the same time. Power goes to the upper thermostat first, which heats the top of the tank, and once that section is hot it passes power to the lower element. That is why a failed lower element leaves you with a small volume of hot water instead of none.
If the top element dies, the lower element never gets power in most designs, so the symptom is no hot water. Replace both elements if the tank is old and one has failed, because the other one has the same age and exposure.
Gas heaters and tankless units work differently, and this guide covers electric tanks only. If your heater is not electric, water heater repair starts with a different set of checks.
Sediment, scale and element life
Elements fail from age, but sediment speeds it up. Minerals and fine silt settle at the bottom of the tank and bury the lower element. The element then overheats under the layer, and its sheath cracks. Draining a few gallons from the tank once a year clears loose sediment.
To flush, turn off the breaker, close the cold supply valve, attach a hose to the drain valve and run it to a floor drain or outdoors. Open a hot tap upstairs so the tank can drain, and let the water run until it clears. A drain valve that clogs or leaks after use is a sign to call, not to force it.
A tank that rumbles, pops or heats slowly often has a heavy layer of sediment. When a flush no longer helps, or the tank is old and leaks at the seams, repair stops making sense. Look at water heater replacement and compare written quotes, including what each covers for removal and disposal.
What you can do and when to call
A homeowner who is comfortable with a meter can check the breaker, press the reset button and test the elements. Anything beyond that should be left to a plumber. We serve Clemmons and nearby towns, including Lewisville, across our service area, and our dispatch line is open 24/7.
We cannot diagnose an element over the phone, because the symptoms overlap with thermostat and wiring faults. A visit confirms the cause, and we explain the price before work starts.
Clemmons plumbing note: soft city water and sediment
The Winston-Salem/Forsyth County Utilities 2025 Water Quality Report lists hardness from 9.0 to 28.0 ppm with an average of 17.5 ppm, which is soft water at roughly one grain per gallon. Soft water means fewer hard scale failures on an element than you would see with harder water. Sediment still collects, so a yearly flush is still useful.
Check your bill to see who supplies your water, because some properties use private wells, and well water can differ from the utility's figures. The report says nothing about wells, so do not assume your water is soft.
Source: Winston-Salem/Forsyth County Utilities 2025 Water Quality Report.
Frequently asked questions
How do I know if the upper or lower element failed?
No hot water at all usually points to the upper element or thermostat. Lukewarm water or a short supply of hot water points to the lower element. A meter test on each element confirms it.
Why does my water heater breaker keep tripping?
A shorted element, damaged wiring or a faulty thermostat can draw too much current. Leave the breaker off and call a plumber, because resetting it repeatedly is a fire and shock risk.
Is it safe to replace a heating element myself?
Only if you can drain the tank, confirm power is off with a tester and fill the tank before restoring power. If any step feels uncertain, call a licensed plumber.
Does soft Clemmons water mean I never need to flush my tank?
No. The utility reports soft water, which means fewer hard scale failures, but silt and sediment still settle in the tank. Homes on private wells have different water and should not rely on the utility's numbers.
Should I repair or replace an old electric tank?
If the tank itself leaks, repair does not make sense. A tank with a failed element but a sound shell is often worth repairing, and a plumber can tell you which situation you are in.
Standards and sources
This guide was written by Clemmons 24/7 Plumbing using general trade practice and the sources named in the local note above. For code questions, the standard to check is the North Carolina State Plumbing Code together with the manufacturer instructions for your product.
Written by Clemmons 24/7 Plumbing. Questions about permits or inspections go to the Winston-Salem/Forsyth County Inspections Division at 336-727-2624, and questions about the water on the utility side of your meter go to your water provider.