5 Signs Your Water Heater Is Failing—and What to Do About It 

When your tanked water heater starts acting up, it’s not just inconvenient—it can be costly. From sudden leaks to rumbling tanks, even small warning signs can turn into big repairs if ignored. And while full-blown water heater disasters are rare, homeowners in Sparks know how quickly a minor issue can escalate when sediment and hard water are involved. 

The good news? Most water heater failures give you early hints long before they reach that point. Knowing what to watch for—and what to do when you spot a problem—can help you avoid expensive damage and keep the hot water flowing. 

1. Your Water Isn’t Getting Hot 

If your water heater struggles to do its one job—heating water—something’s off. You might notice your showers turning lukewarm, your faucets taking longer to warm up, or your hot water running out faster than it used to. 

In many cases, this points to sediment buildup inside the tank. Sparks and Reno both have hard water, which means calcium and magnesium can settle at the bottom of the tank over time, forming a barrier between the burner or heating elements and the water. The result? Poor heating performance and higher energy use. 

If there’s no hot water at all, check whether the pilot light is out if you have a gas water heater or if the thermostat has failed if you have an electric water heater. Either way, don’t ignore the signs—inefficient heating is often your first clue that your water heater is on its way out. 

2. You Hear Knocking, Rumbling, or Popping Sounds 

That low rumble or popping sound coming from your water heater isn’t normal. It’s caused by air bubbles pushing through layers of sediment inside the tank. This buildup is common in Northern Nevada because of the area’s mineral-rich water. 

When sediment collects at the bottom, your water heater must work harder and run longer to heat water. Over time, that extra strain can lead to overheating, metal fatigue, and cracks in the tank. 

If you’re hearing these sounds, it’s time to flush your water heater. This simple maintenance step removes sediment, improves efficiency, and helps prevent long-term damage. A professional plumber can handle it for you quickly—ideally once a year. 

3. Your Hot Water Looks Rusty or Feels Gritty 

If your hot water suddenly has a rusty tint or leaves a gritty residue, corrosion may already be forming inside your tank. Most water heaters are made of steel, which can rust once their internal protection breaks down. 

That protection comes from the anode rod, a metal rod inside your tank that’s designed to corrode before the tank does. Over time, the rod dissolves completely—leaving your tank exposed to rust. 

If you see rusty water, it’s time to get a professional out to check on and potentially replace the anode rod. Catching this early can save your tank, but if the rust has already spread, replacement may be your safest option. 

4. Your T&P Valve Is Leaking or Not Working 

Your temperature and pressure relief (T&P) valve is a safety device designed to release excess pressure if your water heater overheats. When it’s working properly, it keeps your tank safe. When it’s leaking—or worse, not releasing pressure—it’s a serious problem. 

If your T&P valve drips constantly, it could mean mineral buildup, corrosion, or a failing seal. If you test it and no water comes out, it’s not doing its job at all. 

To test safely, place a bucket under the drainpipe, lift the valve’s lever, and listen for hot water rushing down the drainpipe. If little or no water flows, turn off your water heater immediately and call a professional. A faulty valve can cause dangerous pressure buildup inside the tank, and it needs to be replaced right away. 

5. You Spot Leaks Around the Tank 

Any visible leak around your water heater deserves attention. Even a small drip can quickly become a larger leak—or signal that the tank itself is rusting through. 

Leaks can come from failed valves, worn seals, or cracks caused by internal corrosion. In homes across Sparks and Reno, leaks often stem from hard water mineral deposits that eat away at the metal over time. 

If the leak is significant, shut off the water supply immediately and call a plumber. If it’s minor, check nearby fittings and connections to see if the problem is external. But if you notice pooling water at the base of your tank or rust-colored puddles, replacement is likely the safest move. 

Preventing Water Heater Failure 

The best way to avoid a major water heater failure is regular maintenance. Manufacturers recommend having your system professionally inspected at least once a year. During an inspection, our plumbers will: 

• Check for leaks or corrosion around the tank and fittings 
• Test the T&P valve for proper operation 
• Inspect or replace the anode rod 
• Flush the tank to remove sediment buildup 

These quick steps can extend your water heater’s lifespan and protect your home from costly water damage. 

Trusted Water Heater Experts in Sparks, NV 

If you’ve noticed any of these warning signs—or just want peace of mind before winter—All Hours Air is here to help. Our licensed plumbers service homes throughout Sparks, Reno, and the surrounding area, providing inspections, flushes, and replacements for both tank and tankless water heaters. 

We understand how Northern Nevada’s hard water affects your plumbing and can help you keep your system running efficiently year-round. Whether your water heater is rumbling, leaking, or simply aging out, we’ll make sure you get reliable hot water and a safer, more efficient system for years to come. 

Schedule your water heater inspection today and keep your home protected before the cold sets in.