What you need to do before you start

Replacing a water heater element is a task you can do yourself if you have basic tools and follow the steps in order. The element is the heating coil inside the tank that warms the water. Most electric water heaters have one or two elements — top and bottom — and either one can fail. You will need to turn off power at the breaker, drain the tank partially, unscrew the old element, and install a new one that matches your heater's voltage and wattage.

Before you buy a replacement, check your water heater's nameplate — usually a sticker on the side of the tank — to find the voltage (120V or 240V) and wattage (typically 4,500 to 5,500 watts). Elements are not interchangeable across voltage types. A 240V element will not work in a 120V heater and vice versa. If you install the wrong one, it will not heat or may damage the heater.

Key Takeaways

  • Turn off the breaker to the water heater and verify power is off with a voltage tester before you touch any wiring.
  • Drain the tank to below the element level using the drain valve at the bottom — this prevents water from spilling when you remove the element.
  • Buy a replacement element that matches your heater's voltage and wattage, listed on the nameplate sticker on the tank.
  • Use a socket wrench or element wrench to unscrew the old element and screw in the new one hand-tight, then snug it with the wrench.
  • Refill the tank and turn the breaker back on, then wait 30 minutes before using hot water to let the element heat up safely.

Turn off power and drain the tank

Go to your home's electrical panel and flip the breaker that controls the water heater to the off position. The breaker is usually labeled "water heater" or "hot water." If you are not sure which one it is, turn off the breaker and check that the display panel on the heater (if it has one) goes dark, or ask someone to turn on a hot water tap while you watch the heater — if water stops flowing hot, you have the right breaker.

Once the breaker is off, use a non-contact voltage tester on the wires connected to the element to confirm there is no power. A voltage tester is a handheld tool that beeps or lights up when it detects electricity. You can buy one at any hardware store for under $15. This step is not optional — it is the only way to be certain the power is truly off.

Next, locate the drain valve at the bottom of the tank. Attach a garden hose to it and run the hose to a floor drain, sink, or outside. Open the valve and let water drain until the level drops below the element you are replacing. For the top element, you may only need to drain a few gallons. For the bottom element, drain the tank nearly empty. This prevents water from pouring out when you unscrew the element.

Remove the old element

The element is held in place by a large nut or bolt on the outside of the tank. You will see it sticking out from the side or bottom of the heater. Use a socket wrench or a specialized element wrench (also called a water heater element socket) to loosen this nut. Element wrenches are sized to fit the nut without slipping — a regular wrench may round off the edges and make removal harder.

Turn the wrench counterclockwise to unscrew the nut. Once it is loose enough, you can usually finish unscrewing by hand. Pull the old element straight out of the tank. Some water may drip out — have a bucket or towel ready. Look at the element as it comes out. If it is visibly corroded, cracked, or covered in mineral buildup, that confirms it has failed.

Before you install the new element, check the rubber gasket or seal that sits between the element and the tank. If it looks cracked, hardened, or flattened, replace it. Many replacement element kits include a new gasket. If yours does not, buy one separately — a bad gasket will leak water around the element and ruin the repair.

Install the new element

Slide the new element into the opening, making sure the gasket sits flat and centered. The element should go in smoothly without forcing. If it does not, remove it and check that the gasket is positioned correctly and not twisted.

Once the element is fully inserted, screw the nut back on by hand until it is snug. Do not overtighten — you only need enough pressure to seal the gasket. If you crank too hard, you can crack the element or strip the threads. Use the element wrench to tighten it a final quarter turn. The goal is a seal that does not leak, not a connection that requires a wrench to remove later.

Refill and test

Close the drain valve. Open the cold water inlet valve at the top of the tank (usually a ball valve or gate valve) to refill the tank. You will hear water flowing inside. Let it run for a minute to push air out of the tank, then close the inlet valve once water flows steadily without sputtering.

Go back to the electrical panel and flip the breaker back on. The element will begin heating when ready. Wait at least 30 minutes before turning on a hot water tap — this gives the new element time to heat up without shocking the system. When you do turn on hot water, let it run for a few seconds to confirm it is heating. If the water stays cold after 30 minutes, the element may not be making good contact or the breaker may not be fully on.

Check around the element nut on the outside of the tank for drips. A small amount of moisture is normal as the gasket settles, but steady dripping means the gasket did not seal. If that happens, turn off the breaker, drain the tank again, and reseat the element or replace the gasket.

When to call a plumber instead

If the breaker trips when ready after you turn it back on, stop and do not try again. A tripped breaker usually means the new element is defective or you have installed it in a way that is causing a short. Turn the breaker off, drain the tank, and remove the element to inspect it for damage or manufacturing defects.

If you cannot unscrew the old element after 10 minutes of steady pressure with the wrench, the nut may be corroded or stripped. Forcing it risks breaking the element or damaging the tank. At that point, a plumber with specialized tools can remove it without damage. Similarly, if water leaks from the element connection even after you have reseated it twice, the tank threads may be damaged and the heater may need replacement.

If your water heater is more than 10 years old and the element has failed, consider whether replacement makes sense. A new element costs $30 to $100, but an aging tank may fail elsewhere soon after. A plumber can assess whether the tank is worth repairing or if replacement is the better choice.

Frequently Asked Questions

How do I know which element failed if my heater has two?

If you have no hot water at all, the bottom element has likely failed. If you have some hot water but it runs out quickly, the top element is the problem. You can also use a voltage tester on each element's terminal — a working element will show voltage when the breaker is on, while a failed one will not. If you are unsure, replace the bottom element first, since it heats the bulk of the water.

Can I use a universal element that fits multiple heater models?

Universal elements exist, but they are not truly universal — they fit a range of tank sizes and thread types, but voltage and wattage must still match your heater exactly. Always check your heater's nameplate before buying. Buying the wrong voltage is a common mistake that wastes money and time.

What if water leaks from the element connection after I install it?

Turn off the breaker and drain the tank. Remove the element and inspect the gasket for damage or improper seating. Reinstall it, making sure the gasket is centered and flat. Tighten the nut firmly but not excessively. If it still leaks, the gasket may be defective or the tank threads may be damaged — replace the gasket first, and if leaking continues, contact a plumber.

How long does a water heater element usually last?

Most elements last 5 to 10 years depending on water hardness and usage. Hard water causes mineral buildup that corrodes the element faster. If you have replaced an element and it fails again within a year, your water may be very hard — a water softener can extend element life significantly.

Do I need to drain the entire tank to replace an element?

No. Drain only to the level of the element you are replacing. For the top element, you may drain just a few gallons. For the bottom element, drain nearly to empty. Draining the entire tank takes longer and is unnecessary — you only need to drop the water level below the element opening so it does not pour out when you unscrew it.