To replace a heating element in a water heater, you must first shut off the power or gas supply, drain the tank, remove the old element, and install the new one. This guide covers how to replace heating element in water heater safely and effectively, helping you restore hot water without unnecessary delay.
Why Your Water Heater Heating Element Fails
Heating elements in electric water heaters typically last 6–10 years. Sediment buildup, mineral deposits from hard water, and manufacturing defects are the most common causes of failure. When an element burns out, you may notice lukewarm water, unusual noises, or a tripped circuit breaker. According to the U.S. Department of Energy's Energy Saver water heating guide, regular maintenance can extend element life.
Tools and Materials You Will Need
- Voltage tester or multimeter
- Element wrench or socket (1-1/2 inch usually)
- Screwdrivers (flathead and Phillips)
- Garden hose for draining
- Replacement heating element (check wattage and voltage)
- Teflon tape or pipe dope
- Bucket and towels
Step-by-Step Instructions
Step 1: Turn Off Power and Water Supply
At the main breaker panel, switch off the circuit dedicated to the water heater. Use a voltage tester to confirm no electricity is present. Then close the cold water shutoff valve above the heater.
Step 2: Drain the Tank
Attach a garden hose to the drain valve at the bottom of the tank. Route the other end to a floor drain or outside. Open the drain valve and a hot water faucet upstairs to allow air in. Let the tank empty completely—this may take 15–30 minutes.
Step 3: Remove the Access Panels
Unscrew the upper and lower access panels on the side of the heater. Pull back the insulation and remove the plastic safety covers to expose the element and thermostat.
Step 4: Disconnect Wires and Remove Old Element
Take a photo of the wire connections for reference. Loosen the terminal screws and detach the wires. Use an element wrench to unscrew the old element counterclockwise. Expect some residual water to drip out.
Step 5: Install the New Element
Apply Teflon tape or pipe dope to the threads of the new element. Screw it in clockwise by hand, then tighten with the element wrench—do not overtighten. Reconnect the wires exactly as photographed.
Step 6: Refill the Tank and Test
Close the drain valve, remove the hose, and open the cold water supply. Open a hot water faucet until a steady stream flows, then close it. Check for leaks around the element. Restore power at the breaker. After 30–45 minutes, test for hot water.
Common Mistakes to Avoid
- Failing to turn off power before draining—risk of electric shock.
- Overtightening the element, which can crack the tank.
- Installing the wrong wattage or voltage element (e.g., 4500W vs 5500W).
- Not flushing sediment before installing a new element.
When to Call a Professional
If you are uncomfortable working with electricity, lack the proper tools, or the tank is older than 10 years, it may be safer to hire a licensed plumber. A professional can also inspect the thermostat and wiring. For expert help, visit our water heater repair page.
Cost Considerations for Replacement
| Item | Typical Cost Range (US) |
|---|---|
| Heating element (part only) | $15 – $50 |
| Element wrench | $10 – $25 |
| DIY total (tools + part) | $25 – $80 |
| Professional service call | $150 – $400 |
Prices vary by region and brand. Always verify your water heater model before purchasing parts.
Preventive Tips to Extend Element Life
Flush your water heater annually to remove sediment. The Environmental Protection Agency's WaterSense program recommends checking the temperature setting—120°F is both safe and efficient. Installing a water softener reduces mineral buildup in areas with hard water. Additionally, inspect the anode rod every few years; a corroded rod can accelerate element failure.
Safety Warnings
Never operate an electric water heater without water in the tank—the elements will burn out in seconds. Always use a voltage tester before touching any wires. If you smell gas (for gas heaters) or see rust-colored water, stop immediately and contact a professional.
Frequently Asked Questions
How do I know which heating element to buy?
Check the label on your water heater for wattage and voltage (e.g., 4500W, 240V). You can also remove the old element and read its markings. Using a mismatched element can cause poor performance or tripping breakers.
Can I replace only one element if the other is still good?
Yes, but many professionals recommend replacing both upper and lower elements at the same time, since the other may be close to failure. This saves labor if you’re doing the job yourself.
How long does it take to replace a heating element?
For a DIY homeowner with basic tools, expect 1 to 2 hours, including draining and refilling. A professional plumber can finish in 30–60 minutes.
What if the element is stuck and won’t unscrew?
Apply penetrating oil (like WD-40) around the threads and wait 15 minutes. Use a longer wrench handle for extra leverage. If it still won’t budge, call a plumber to avoid damaging the tank.
Is it worth repairing an old water heater?
If the tank is less than 10 years old, replacing an element is cost-effective. For units over 10–12 years, consider full replacement to avoid future leaks. Our pipe repair and leak detection services can help assess your system.
Do I need to drain the entire tank?
Yes, the element sits near the bottom of the tank. Draining is required to access and remove it safely. Partial draining may leave water that can short out the new element.
Get Professional Help
If you’d rather leave this job to the experts, MyTownPlumber offers fast, reliable water heater repair and drain cleaning services across the US. Contact us today for a free estimate or check our current plumbing offer.