5 Signs Your Water Heater Is About to Fail (and What to Do Next)

Nobody thinks about their water heater until the morning shower goes cold.

1. Your Hot Water Looks Rusty or Discolored

If you turn on the hot tap and the water comes out with a reddish or brownish tint, that's usually rust forming inside your tank. The anode rod, a metal rod inside the tank designed to attract corrosion, may be spent. Once that rod is gone, the tank itself starts to corrode from the inside out.

What to do: If the discoloration only happens with hot water (not cold), the problem is likely your water heater, not your pipes. Call a plumber to inspect the anode rod. Replacing it is inexpensive and can extend the life of your tank by several years. If the tank itself is corroded, replacement is the safer bet.

2. You Hear Popping, Rumbling, or Banging Noises

As sediment builds up at the bottom of your tank, it hardens and creates a layer between the burner and the water. When the burner fires, you hear popping or rumbling as water trapped under the sediment gets superheated. The more sediment, the louder and more frequent the noise.

What to do: A professional flush can remove sediment buildup and quiet things down. If your water heater hasn't been flushed in years, the sediment may be too thick to clear, and the tank may already be damaged. Annual flushing is the easiest way to prevent this.

3. Water Is Pooling Around the Base of the Tank

A puddle around your water heater is never a good sign. It could be a leaking pressure relief valve (a relatively simple fix) or a crack in the tank itself (which means replacement). Even a small leak can cause serious water damage to your floors, walls, and anything stored nearby.

What to do: Turn off the power to the unit (breaker for electric, gas valve for gas) and the cold water supply valve at the top of the tank. Then call a plumber. Don't wait on this one. A slow leak today can become a flooded room tomorrow.

4. Your Hot Water Doesn't Last Like It Used To

If you used to get through two showers and a load of dishes without running out of hot water, but now you're going cold halfway through the second shower, your water heater is losing capacity. Sediment buildup reduces the amount of water the tank can hold and heat. In electric models, a failing lower heating element is another common culprit.

What to do: Start with a professional inspection. A flush and element replacement may solve the problem. If your tank is over 10 years old and losing capacity, it may be more cost-effective to replace it than to keep repairing it. Ask your plumber about tankless options if you want hot water that never runs out.

5. Your Water Heater Is Over 10 Years Old

Most traditional tank water heaters last 8 to 12 years. If yours is approaching or past that range, it's living on borrowed time, especially here in the Lowcountry where hard water accelerates wear on internal components. Check the serial number on the manufacturer's label. The first two digits usually indicate the year it was made. The Department of Energy has helpful guidance on water heater lifespan and efficiency.

What to do: Even if your water heater seems fine, start budgeting for a replacement now. A planned replacement on your schedule is always less stressful and less expensive than an emergency swap after a flood in your utility closet. We offer flexible financing options to help make the transition easier.

Don't Wait for the Cold Shower

Your water heater works hard every day, and it's one of those appliances most people forget about until something goes wrong. If you're noticing any of these signs, a quick inspection from a licensed plumber can tell you exactly where things stand.

At Coastal Air Plus, creating lasting relationships is what we're all about. Our plumbers serve homeowners across Charleston, Mount Pleasant, Goose Creek, and the entire Grand Strand.