How to Check the Elements on a Water Heater: A Comprehensive Guide
To check the elements on a water heater, you’ll need to safely turn off the power, drain the tank partially, remove the access panels, and use a multimeter to test each element for continuity; this confirms if the heating elements are still functioning properly and need replacement.
Understanding Water Heater Elements
Water heaters, especially electric models, rely on heating elements to warm the water inside the tank. These elements are essentially high-resistance coils that convert electrical energy into heat. Over time, these elements can burn out due to sediment buildup, overheating, or general wear and tear, leading to reduced hot water availability or no hot water at all. Knowing how do I check the elements on a water heater? is an essential skill for any homeowner.
Why Check Your Water Heater Elements?
Regularly checking your water heater elements offers several benefits:
- Early Problem Detection: Identify failing elements before they completely fail, preventing cold showers and costly emergency repairs.
- Energy Efficiency: A partially functioning element forces the working element to work harder, increasing energy consumption. Replacing faulty elements restores efficiency.
- Extended Water Heater Lifespan: Addressing issues promptly prevents further damage to the water heater tank and other components, prolonging its lifespan.
- Cost Savings: Replacing a relatively inexpensive element is significantly cheaper than replacing the entire water heater.
The Process: Checking Your Water Heater Elements Step-by-Step
Before you begin, safety is paramount. Make sure you have the right tools and understand the electrical hazards involved.
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Gather Your Supplies:
- Screwdrivers (Phillips and flathead)
- Multimeter
- Voltage tester
- Adjustable wrench or socket wrench
- Bucket and hose
- Gloves and safety glasses
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Turn Off the Power: Locate the circuit breaker for the water heater and switch it off. Always verify that the power is off using a voltage tester before proceeding.
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Drain the Tank (Partially): Connect a hose to the drain valve at the bottom of the water heater. Place the other end of the hose in a drain or outside. Open the drain valve and allow several gallons of water to drain out. You only need to drain enough water to be below the level of the upper heating element.
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Remove the Access Panels: Locate the access panels (usually two) on the side of the water heater. Use a screwdriver to remove the screws holding them in place. Be cautious, as there may be insulation behind the panels.
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Remove the Insulation: Carefully remove the insulation from behind the access panels to expose the heating element terminals.
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Test for Voltage (Again!): Use a voltage tester on the terminals to double-check that the power is indeed off. Even with the breaker off, stray voltage can sometimes be present.
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Disconnect the Wires: Carefully disconnect the wires from the heating element terminals. Make note of which wire goes to which terminal (take a picture if necessary) to ensure proper reconnection later.
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Test for Continuity: Set your multimeter to the ohms setting (resistance). Place one probe on one heating element terminal and the other probe on the other terminal. A functioning element should show a reading between 10 and 20 ohms, depending on the element’s wattage and voltage. An element with infinite resistance (open circuit) is faulty and needs replacement.
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Test for Ground: With the multimeter still set to ohms, place one probe on either terminal and the other probe on the water heater tank (bare metal). A functioning element should NOT show continuity to ground. Any continuity indicates a short to ground, meaning the element is faulty and poses a safety hazard.
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Repeat for All Elements: If your water heater has multiple elements (usually two), repeat steps 7-9 for each element.
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Reassemble: If the elements tested good, reconnect the wires to the terminals as they were originally connected. Replace the insulation and access panels. If you replaced elements, use a pipe wrench to carefully tighten the new elements.
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Refill and Repower: Close the drain valve. Open a hot water faucet to allow air to escape the tank as it refills. Once the tank is full and water is flowing steadily from the faucet, turn the circuit breaker back on.
Common Mistakes to Avoid
- Ignoring Safety: Failing to turn off the power is extremely dangerous. Always double-check that the power is off before touching any wires or components.
- Over-Tightening Elements: When replacing elements, over-tightening can damage the tank threads. Tighten until snug, then give it a slight additional turn.
- Forgetting to Drain the Tank: Attempting to remove elements without draining the tank will result in a major water mess.
- Incorrect Wiring: Reconnecting the wires incorrectly can damage the water heater or create a fire hazard. Refer to your notes or photos to ensure proper wiring.
- Using the Wrong Elements: Ensure that the replacement elements have the correct voltage and wattage rating for your water heater. This information is usually found on a label on the water heater tank.
Identifying Element Failure Symptoms
| Symptom | Possible Cause |
|---|---|
| No hot water | Both elements failed |
| Not enough hot water | One element failed or is failing |
| Lukewarm water | One or both elements failing |
| Rusty/Discolored water | Sediment buildup on elements |
| Increased energy bills | Inefficient heating due to failing elements |
| Popping or rumbling noises | Sediment buildup on elements |
Frequently Asked Questions (FAQs)
What tools do I absolutely need to check the elements?
At a minimum, you’ll need a multimeter, a screwdriver to remove the access panels, and a voltage tester to confirm the power is off. Gloves and safety glasses are also highly recommended.
How do I know what wattage element to buy as a replacement?
The wattage of the element is typically printed on the existing element itself. You can also find this information on the water heater’s nameplate or in the owner’s manual. Always replace with the same wattage element.
Is it possible to replace only one element if one is bad?
Yes, absolutely. You can replace only the faulty element if the other element is still functioning correctly. It’s good practice to inspect both while you’re working on the water heater.
What does it mean if my element has continuity to ground?
Continuity to ground indicates a short circuit within the element. This means the element is faulty and poses a significant electrical hazard. The element must be replaced immediately.
Can sediment buildup cause the elements to fail?
Yes, sediment buildup is a common cause of element failure. Sediment acts as an insulator, causing the element to overheat and eventually burn out. Regularly flushing your water heater can help prevent sediment buildup.
How often should I flush my water heater to prevent element failure?
It’s generally recommended to flush your water heater at least once a year, and potentially more often if you live in an area with hard water.
What are the risks of not replacing a faulty water heater element?
Ignoring a faulty element can lead to increased energy consumption, a complete loss of hot water, and potentially damage to other components of the water heater. A shorted element could also pose a fire hazard.
Can I check the elements while the tank is full of water?
No, you must drain the tank partially to expose the elements. Attempting to remove or test elements while the tank is full will result in a dangerous and messy situation.
My multimeter reads zero ohms when testing the element. What does that mean?
A reading of zero ohms (or very close to zero) typically indicates a short circuit within the element. While it might seem like the element is working perfectly, it’s likely damaged and should be replaced.
Is it safe to test the heating element with the multimeter still connected to the water heater?
No, never test a heating element connected to the power grid. All circuits must be disconnected and power breaker turned off before using your multimeter.
I’m not comfortable working with electricity. Should I hire a professional?
If you are not comfortable working with electricity, it is always best to hire a qualified electrician or plumber to check and replace your water heater elements. Safety should always be your top priority.
How can I extend the lifespan of my water heater elements?
Regularly flushing your water heater to remove sediment, using a water softener if you have hard water, and not setting the water temperature too high can all help extend the lifespan of your water heater elements.