What You Need to Know Before Starting

Replacing a heating element in an electric hot water tank is a job you can do yourself if you are comfortable working with basic tools and electrical connections. The element itself costs between $15 and $50 depending on wattage and brand. The process takes two to four hours and requires you to drain the tank, remove the old element, and install the new one — no special license is needed in most places, though some jurisdictions require a licensed electrician for any water heater work.

Before you begin, check your tank's manual or the nameplate on the side to find the exact element type, wattage, and voltage. A mismatch will either not heat the water or damage the tank. If your tank is still under warranty, replacing the element yourself may void it — check the terms first.

This guide covers electric resistance elements only. If you have a gas water heater, a heat pump unit, or a tankless system, the repair process is different and usually requires a professional.

Key Takeaways

  • Turn off power at the breaker and test the outlet with a voltage tester before touching any wires or the element itself.
  • Drain the tank completely through the drain valve at the bottom, which takes 30 to 60 minutes depending on tank size.
  • Use an element wrench (a large socket designed for water heater elements) to unscrew the old element — a regular wrench will slip and damage the fitting.
  • Install the new element with a rubber gasket, hand-tighten first, then use the element wrench to snug it without over-tightening, which cracks the gasket.
  • Refill the tank and bleed air from the hot water line before restoring power, or you risk running the element dry and burning it out.

Tools and Materials You Will Need

Gather these items before you start: a voltage tester (non-contact or multimeter), an element wrench sized for your tank (usually 1.5 inches or larger), an adjustable wrench or socket set, a bucket or hose for draining, a new heating element with the correct wattage and voltage, a rubber gasket (usually comes with the element), and a flashlight or headlamp.

An element wrench is essential — it is a deep socket with a slot that grips the element's hex head without slipping. A regular wrench will round off the fitting and make removal impossible. You can rent an element wrench from most tool rental shops for $5 to $10 per day, or buy one for $20 to $40.

If you do not have a voltage tester, buy a non-contact one for $10 to $15. It tells you whether power is still flowing to the outlet, which is the only safe way to confirm the breaker actually cut the circuit.

Step-by-Step Replacement Process

Step 1: Turn off power and test. Locate the breaker for your water heater and switch it to the off position. Wait five minutes, then use your voltage tester on the outlet or terminal where the element connects. If the tester shows no power, you are safe to proceed. If it shows power, the breaker is not the right one — find the correct breaker and test again.

Step 2: Drain the tank. Attach a garden hose to the drain valve at the bottom of the tank and run it to a floor drain, outside, or into a bucket. Open the drain valve by turning the handle counterclockwise. The water will be hot, so let it cool slightly before opening the valve fully. Once the tank is empty, close the valve.

Step 3: Remove the old element. Locate the element — it is usually on the side or bottom of the tank, held by a large hex nut. Place your element wrench over the nut and turn counterclockwise. The element may be stuck if it has mineral buildup; explore penetrating oil and wait 10 to 15 minutes, then try again. Once loose, unscrew it by hand and set it aside. Remove the old rubber gasket.

Step 4: Install the new element. Place the new rubber gasket on the new element's threaded base. Insert the element into the opening and hand-tighten it until the gasket seats. Then use the element wrench to turn it another quarter turn — no more. Over-tightening crushes the gasket and causes leaks.

Step 5: Refill and bleed air. Close the drain valve. Open the cold water inlet valve at the top of the tank and let water flow in slowly. Open the nearest hot water faucet in your home and let it run until water flows steadily with no sputtering — this removes trapped air. Close the faucet and finish filling the tank.

Step 6: Restore power. Once the tank is full and no air is coming from the faucet, switch the breaker back on. The element will begin heating. Check for leaks around the element fitting after 30 minutes.

Common Mistakes That Damage the New Element

Running the element dry is the most common cause of premature failure. If you restore power before the tank is completely full, the element will overheat and burn out in minutes. Always refill the tank and bleed air from the hot water line before turning the breaker back on.

Over-tightening the element cracks the gasket and causes slow leaks that may not show up for days. Hand-tighten until snug, then use the wrench for only a quarter turn. If water drips from the fitting after 30 minutes, turn the breaker off, drain the tank, remove the element, replace the gasket, and reinstall with less force.

Using the wrong element wattage or voltage will either produce no heat or trip the breaker repeatedly. Check your tank's nameplate before ordering — common sizes are 4500W at 240V for standard tanks and 5500W for larger ones, but yours may differ.

When to Call a Professional Instead

If the element wrench does not budge the old element after explore penetrating oil and waiting, the fitting may be stripped or corroded beyond hand removal. A plumber has power tools that can extract it without damaging the tank. This usually costs $150 to $300 in labor.

If water leaks from the fitting after you have reinstalled the element with a new gasket, the tank's threaded hole may be damaged. Attempting to force a larger element into a stripped hole will crack the tank. A professional can assess whether the hole can be repaired or the tank needs replacement.

If your tank is more than 10 years old and the element has failed, consider replacing the entire tank rather than the element. A new tank costs $400 to $800 installed and comes with a warranty; an element replacement on an aging tank may fail again within a year.

Testing the New Element After Installation

After power is restored, the tank should begin heating within 15 to 30 minutes. Feel the side of the tank — it should become warm to the touch. If it stays cold after an hour, the element may not be making electrical contact or the breaker may have tripped.

Check the breaker first — if it is in the middle position (tripped), switch it fully off and back on. If it trips again when ready, turn it off and do not restore power. This usually means the new element is defective or the wiring has a short. Contact the element manufacturer or a plumber.

If the breaker stays on but the tank does not heat, use a voltage tester on the element terminals to confirm power is reaching it. If power is present but the tank is not heating, the element itself is faulty and needs replacement under warranty.

Frequently Asked Questions

How long does a water heater element last?

Most elements last five to ten years depending on water hardness and usage. Hard water causes mineral buildup on the element, which insulates it and shortens its life. If you have hard water, expect replacement every four to six years. Flushing the tank once a year removes some sediment and extends element life.

Can I replace the element without draining the whole tank?

No. The element is under pressure when the tank is full, and unscrewing it will cause a sudden spray of hot water. You must drain the tank completely first. Some people drain only partially to save time, but this leaves enough pressure to cause injury.

What if my tank has two elements?

Larger tanks have an upper and lower element that heat in sequence. If only one has failed, you can replace just that one. If both have failed, replace both at the same time — they usually wear at similar rates, and replacing one while the other is failing will cost you a second service call soon after.

Do I need to turn off the water supply to replace the element?

No, but you must turn off the cold water inlet valve at the top of the tank before draining. This prevents water from flowing in while you work. The main water shutoff is not necessary unless you are also doing other plumbing work.

Is it safe to replace the element myself if I have never done it before?

Yes, if you follow the steps carefully and use a voltage tester to confirm power is off. The main risks are electrical shock (prevented by testing) and burns from hot water (prevented by draining). Take your time, do not rush, and stop if something does not feel right — a plumber can finish the job if you are uncomfortable.