How to Tell if a Water Heater Element is Bad – A Complete Guide

Having trouble getting hot water from your water heater lately? An insufficient or fluctuating supply of hot water is often a sign that the heating element in your unit needs replacing. As a home improvement expert who has replaced countless water heater elements, I‘ve put together this comprehensive guide on identifying when an element is bad, troubleshooting tips, how to properly replace it yourself, and steps to prevent element failure in the future.

How Do Water Heater Elements Work?

Inside your water heater tank are one or two electric heating elements that heat the water. When the thermostat calls for hot water, the elements warm the water directly by electric current flowing through high resistance metal coils – a process called Joule or resistive heating.

The common residential elements use spiral wound metal tubing with magnesium oxide insulation inside. As electricity passes through, the coils heat up to temperatures of 350°F to 550°F. The surrounding water absorbs this thermal energy.

A cutaway view of a water heater showing the screw-in heating element

The proper wattage and voltage rating is critical for an element to work correctly. Low wattage can mean slow recovery and inadequate hot water capacity. High wattage with insufficient flow allows the element to overheat.

I always recommend having a plumbing professional assess your specific water heater to determine optimal wattage and voltage for replacement elements.

Signs It‘s Time to Replace the Element

How can you tell if the heating element is wearing out or malfunctioning? Watch for these warning signs:

• Hot water runs out quickly or recovers slowly after use
• Decrease in water temperature – Lukewarm instead of 120°F
• Clanging, buzzing or popping noises from the tank while heating
• Bottom element makes sizzling or percolating noises
• Circuit breaker trips repeatedly when hot water runs
• Sediment or rust colored water coming from faucets
• Dry burning smell or scorch marks on external tank

In my experience, insufficient hot water is one of the most common signs of elements on their way out.

As a point of reference, the average lifespan of a water heater element is 5-10 years. But it can vary:

• Electric standard elements: 8-12 years
• Electric high recovery: 3-5 years
• Gas water heaters: 5-7 years

If your water heater is around this age, be on the lookout for any decreases in performance. Catching a dying element early allows you to restore full functionality fast.

Testing the Element with a Multimeter

You‘ll want to verify an element is bad before replacing. I always start by testing resistance with a multimeter.

Follow these steps:

1. Turn off the power to the water heater at the breaker panel and the water inlet valve.
2. Drain the tank into buckets until the water level is below the element.
3. Remove the access panel and insulation. Disconnect wires from element.
4. Set multimeter to 200 ohm setting. Attach leads to the two screw terminals.
5. Check the reading. A properly working element will read 10-16 ohms. Outside this indicates failure.
6. Repeat test on both elements if you have an electric model.

You should also inspect visually for damage like cracks or burned spots. Discoloration happens with overheating from sediment buildup.

If an element tests as bad, replacement is the solution. Match the new element‘s voltage, wattage and dimensions to the original.

Step-by-Step Guide to Replacing a Water Heater Element

Replacing a water heater element is a straightforward DIY project. Just be sure to turn off electrical and water supply and have a bucket handy to catch leakage. Then follow these steps:

Supplies You‘ll Need:

• Replacement element with matching specs
• Adjustable wrench
• Wire cutters and wire strippers
• Teflon tape
• Multimeter
• Protective eyewear & gloves

Installation Steps:

1. Turn off power and water supply, attach hose to drain and empty tank.
2. Disconnect electrical wires from bad element using wire cutters.
3. Unscrew old element using a wrench – lefty loosey. Remove from tank.
4. Clean opening of any sediment buildup with a wire brush.
5. Apply teflon tape to the threads of the new element.
6. Hand tighten new element clockwise into tank opening. Finish tightening with wrench.
7. Reconnect electrical wires to new element, insulating connections.
8. Refill tank, check for leaks at element seal.
9. Restore power and water supply. Verify proper temperature settings.
10. Retest resistance and current draw with multimeter to confirm it‘s working.

And you‘re done! I always recommend replacing both elements at once if one fails. It avoids future service calls for only a small additional cost.

Preventing Element Failure

To maximize the lifespan of your water heater elements and avoid unexpected breakdowns, I recommend annual preventative maintenance:

• Drain and flush sediment: Every 6-12 months helps prevent mineral buildup fouling elements. Use a hose on full blast.
• Inspect anode rod: Replace if more than 6′′ of core wire is exposed. Protects against corrosion damage.
• Check connections: Loose electrical wires cause overheating over time.
• Lower thermostat: Set to 120°F unless you need higher temp. Reduces sediment accumulation rate.
• Consider water treatment: If you have hard water, products like polyphosphate or water softeners minimize scale.
• Check insulation: Replace if worn. Keeps elements operating efficiently.

Planned inspection and maintenance provides substantial returns by reducing expensive premature element failure!

Troubleshooting Hot Water Problems Beyond Elements

While a malfunctioning element is the most common cause of hot water issues, here are some other parts to check:

Thermostats wear out over 5-10 years. Test continuity with a multimeter. Replace if necessary.

High limit switches prevent unsafe overheating if stuck closed. Reset and test continuity.

Wiring connections can corrode and cause resistance. Repair or replace.

Sediment buildup insulates the element from water. Flush regularly.

Flow restriction caused by stuck T&P valve or clogged heat traps reduces hot water capacity.

Undersized elements lead to slow recovery during high demand. Confirm elements match water heater rating.

Use this handy flow chart of typical electric water heater problems to isolate the issue:

[Insert troubleshooting flow chart]

Replacing a faulty heating element is usually a quick fix to restore hot water. But contact a technician if you‘re unsure of the source of the problem.

When it‘s Best to Call a Professional

Some situations where I‘d recommend calling a licensed plumber or contractor rather than DIY:

• You smell gas or the tank is leaking
• The water heater is over 10 years old
• Electrical connections are damaged
• Sediment buildup looks severe
• Multiple repairs are needed beyond just the element
• Pipes show significant corrosion
• You feel unsafe performing electrical work

Replacing an element is simple. But a pro can assess your whole system to prioritize necessary repairs. They have the expertise to identify underlying issues.

Give Your Hot Water Heater Some Love!

I hope you found this guide helpful for determining when your water heater‘s element needs replacing. Remember, well-maintained elements can last 10-15 years, while neglected ones fail in as little as 3-5 years.

Catching problems early, regularly draining sediment, and replacing anode rods can pay off exponentially in equipment lifespan and performance. Your hot water availability will improve dramatically compared to limping along with a failing element.

If you need help with your water heater or determining when repairs are needed, don‘t hesitate to get in touch! I‘m always happy to chat about optimizing your plumbing and HVAC systems. Here‘s to comfortably long showers and bubble baths!