Replacing a faulty water heater element is a common DIY repair that can restore hot water to your home. In this guide, we’ll show you exactly how to replace water heater elements safely and effectively, saving you the cost of a service call. Whether your water heater produces lukewarm water or no hot water at all, a burned-out element is often the culprit. We’ll walk you through the entire process, from gathering tools to testing the new element.
Before You Start: Safety First
Water heaters store electricity even when turned off. Always turn off the circuit breaker supplying power to the heater at the main panel and verify with a non-contact voltage tester. Shut off the cold water supply valve at the top of the heater. If you smell gas, step away and call a professional immediately. For electric water heaters, never risk working on a live unit. The CDC recommends treating any water heater that has been submerged in floodwater as potentially contaminated – in that case, replacement is often safer than repair.
Tools and Materials Needed
Gather the following items before starting. Using the correct tools prevents damaging the tank threads.
- New water heater element (check your existing element’s voltage, wattage, and thread type – typically 1.5″ or 2″ diameter, 120 V or 240 V)
- Element wrench (or a 1.5″ socket wrench for screw-in elements)
- Flathead screwdriver (for bolt‑in elements)
- Non‑contact voltage tester
- Garden hose (for draining)
- Bucket or drain pan
- Teflon tape or plumber’s putty (depending on element design)
- Safety glasses and work gloves
- Multimeter (optional, for testing continuity)
Identifying the Faulty Element
Most electric water heaters have two elements: an upper and a lower. If you have no hot water at all, the upper element may be burned out. If you run out of hot water quickly, the lower element is likely the issue. Use a multimeter to test continuity between the element screws and the metal flange: a reading of zero resistance means the element is shorted and needs replacement. The U.S. Department of Energy notes that sediment buildup can also accelerate element failure, so flushing your tank annually extends element life.
Step-by-Step Replacement Guide
Step 1: Turn Off Power and Water
At the main breaker panel, flip the breaker labeled “water heater” to the OFF position. Confirm power is off with the voltage tester. Close the cold water shut-off valve on top of the unit.
Step 2: Drain the Tank
Attach a garden hose to the drain valve at the bottom of the tank and run the other end to a floor drain or outside. Open a hot water faucet upstairs to let air into the system. Open the drain valve and let the water flow until it stops. Expect sediment – be prepared for murky water. If the drain valve is clogged, you may need to replace it; our drain cleaning services can help with stubborn blockages.
Step 3: Remove the Old Element
Access the element compartment by removing the access panel(s) – usually held by one or two screws. Carefully pull back any insulation. Use an element wrench to unscrew the element counter‑clockwise. For bolt‑in elements, remove the nuts with a flathead screwdriver. Have a bucket ready for residual water. Inspect the gasket; if it’s cracked or missing, you’ll need a new one.
Step 4: Install the New Element
Wrap Teflon tape around the threads of a screw‑in element (2–3 wraps). Insert the new element and tighten it clockwise – hand‑tighten first, then use the element wrench for a snug fit. Avoid overtightening, which can crack the tank. For bolt‑in elements, place the gasket and tighten nuts evenly. Reconnect the wiring: typically a black wire to one screw, white (or red) to the other, and green ground to the tank’s ground screw. Torque to manufacturer specifications if available.
Step 5: Refill and Test
Close the drain valve, turn on the cold water supply, and open a hot water faucet to purge air. Once water flows steadily from the faucet, close it. Check for leaks around the element and at the drain valve. Turn the breaker back on and wait 20–30 minutes for the water to heat. Test the temperature at a faucet. If you still have issues, you may need to reset the high‑limit thermostat. For persistent problems, consider professional water heater repair.
Troubleshooting Common Element Issues
| Signs | Likely Cause | Solution |
|---|---|---|
| No hot water at all | Upper element burned out or thermostat failed | Replace upper element; test thermostat |
| Water heats slowly or runs out quickly | Lower element failing or heavy sediment build‑up | Replace lower element; flush tank |
| Water is too hot | Thermostat set too high or stuck | Adjust thermostat; replace if defective |
| Element screws show corrosion/arc marks | Loose connections or moisture inside cover | Replace element and gasket; tighten wiring |
If you notice a sulfur or rotten egg smell after replacing an element, the anode rod may need replacement – leak detection can also help identify hidden issues.
When to Call a Professional
While replacing a water heater element is straightforward for many homeowners, some situations warrant expert help. If your water heater is more than 10 years old, the tank may have internal corrosion that makes element replacement ineffective. Electrical work beyond replacing a single element – such as rewiring the thermostat or replacing the breaker – should be done by a licensed electrician. If you have a gas water heater (which uses a burner, not elements), this guide does not apply. For complex failures or if you’re uncomfortable with any step, our team at MyTownPlumber can handle the job quickly and safely. We also offer pipe repair and other services to keep your home’s plumbing in top shape.
Ready to save on your water heater repair? Take advantage of our current offer for MyTownPlumber customers. Visit our plumbing offer page to claim a discount on water heater element replacement or any other plumbing service you need.
— MyTownPlumber Editorial Team