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5 Signs Your Water Heater is Failing

We’ve all heard the horror stories about water heaters becoming pressurized rockets that explode through the roof of the house or about families leaving on vacation and coming home to find the water heater has ruptured and filled the home with water. These are gripping tales of woe that seize the heart of every homeowner for many reasons. One, it’s because, while rare, the stories are true. Two, it’s because water heater failures can cost thousands to tens of thousands of dollars in repairs and sometimes cause irreversible damage.

Fortunately, there are many things you can do to prevent such catastrophes from happening. If you are regularly monitoring and maintaining your system, you can watch for trouble and hopefully prevent system failures.
1. LACK OF HOT WATER

Something is definitely wrong with a hot water heater that fails to do its primary job. There are a number of things you can check, and some of them call for a simple fix while others require more extensive repairs. But first, ask yourself some questions. Are you not getting any hot water at all? Or is the water lukewarm instead of hot like it should be? Is the water from the tap taking forever to warm up? Barring any overuse issues, such as the hot water simply being all used up from the tank, the answers to these questions will help troubleshoot the problem.

Why this is bad: If you’re getting lukewarm water or the water is taking forever to warm up at the tap, this is likely to be a problem related to sediment buildup in the tank. On the other hand, if there is no hot water, or even warm water, your pilot light may be out. This would prevent your whole system from functioning and producing hot water for the house. 

2. YOU HEAR A KNOCKING OR POPPING NOISE COMING FROM THE WATER HEATER

If you can hear a popping sound coming from your water heater tank, this means you probably have a large amount of sediment at the bottom of your tank. This can happen naturally over time as calcium and magnesium collect in the tank from your hard water. As that sediment layer gets thicker, when the gas kicks on to start heating the water, it has to get through that sediment layer first. So, the popping, knocking noises are air bubbles escaping the sediment.

Why this is bad: In order to get through that sediment layer, the water heater must work much harder to heat the water. This can cause overheating as well as a lot of wear and tear on the tank itself. Those minerals can break down and deteriorate the inside of the tank.

What you can do: You need to flush out your tank immediately. For instructions on how to flush your water heater yourself, see below. Otherwise, a licensed plumber can perform this service for you, which is recommended as part of your annual water heater maintenance.

  Click here for instructions on how to flush a water heater

3. YOUR HOT WATER IS A RUSTY, BROWNISH COLOR OR COMES OUT GRITTY

If you turn on the hot water anywhere in the house and it comes out a rusty color and/or tastes like rust, it could be that your anode rod has expired and your water heater is starting to rust. Your water heater tank is made from steel, which is mostly iron. All tanked water heaters have an anode rod, sometimes called a sacrificial anode rod, installed in the tank that is designed to deteriorate to save the interior of your tank.

Why this is bad: A rusty tank not only makes your hot water look and taste foul but also, it is susceptible to failure. If you’ve ever seen an old, rusted car, the same thing is happening to the inside of your tank. If the tank is rusting, it’s just a matter of time before it fails. And a failed hot water tank could mean leaks, ruptures, and floods.

What you can do: First, check the anode rod to see if it has completely deteriorated. Next, you may need to drain the tank and inspect the insides. If the damage is minimal, you could replace the anode rod and be sure to replace it regularly to prevent further damage to the inside of your tank. However, if the damage is substantial, you’ll need to replace your water heater before it fails.

  Click here to find out how to check or replace your anode rod yourself

4. YOUR T&P VALVE IS LEAKING

The T&P valve is designed to open and release pressure inside the tank if the temperature or pressure gets too high. If your T&P valve is either always leaking or if you test it and no hot water comes out, you’ve got a problem on your hands.

Why this is bad: Think about it this way: if the T&P valve is designed to release pressure but doesn’t do its job, internal pressure in the water heater will continue to build and build until the water heater actually explodes. While very rare, water heaters have been known to rocket through the roofs of houses, leaving 50 gallons of boiling hot water and steam in their wakes. What a mess! Mineral or salt buildups, rust, corrosion, or mechanical equipment failure can cause T&P valves to malfunction. A failed or malfunctioning T&P valve can lead to quite a mess and in some extreme cases, can lead to catastrophic damage.

What you can do: Testing the T&P valve is relatively simple. Raise and lower the test lever several times, which should lift the brass stem that is attached to the valve. When you raise the test lever, hot water should rush from the drainpipe down the drain. If either very little or no water comes out, the T&P valve must be replaced immediately. Replacing the valve is something you can do yourself or you can hire a licensed plumber to replace it for you. But do make sure you get it fixed so the tank doesn’t overheat! If you decide to have a plumber perform the replacement, you should have him perform a thorough maintenance check as well so you can be sure everything else in the water heater is functioning properly. Particularly if rust or corrosion caused the valve to fail, it may be evidence of further corrosion inside the tank.

  Click here to learn more about how to check your T&P valve

4. YOUR T&P VALVE IS LEAKING

A leaking tank is never a good sign! Whether rust, corrosion, or failing parts, small leaks lead to bigger ones!

Why this is bad: If your anode rod has expired or too much sediment has built up in your tank, rust and corrosion could be leading to leaks around seals or seams in your tank. If your valves themselves have failed or the seal around your valves has failed, this could also lead to leaks. As mentioned above, a malfunctioning T&P valve could also lead to leaks. Either way, leaks must be investigated and fixed to avoid bigger problems like total failure and flooding.

What you can do: First, if the leak is really bad, shut off the water to the tank at the water shut-off valve. Next, start draining the tank from the drain valve and call a plumber. If the leak is minor, perform a visual inspection to see if you can detect where the leak might be coming from. If you can find the origin, look at the steps above to determine which component might be the culprit. Otherwise, if there is pooling around the base of the water heater and you can’t figure out where it’s coming from, have a professional plumber come and diagnose the system. Particularly if the water around your tank is a rusty color, call a plumber immediately! Chances are good the inside of your tank has corroded and must be replaced.

Manufacturers recommend that you have your water heater inspected once per year. Be sure, in this yearly check, to examine the outside of your tank for leaks, test the T&P valve, inspect the anode rod, and check the water at the bottom of the tank for high levels of sediment.
 
There are many other components in your water heater; if you don’t feel comfortable checking everything yourself, have a licensed plumber come and perform the check for you. If you don’t have a plumber you trust and are in the central Utah area, give Any Hour Services a call and we’ll send out a water heater specialist from our plumbing department who can make sure your water heater is in good shape for years to come!
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Pricing FAQ

A:

Our pricing is fair and transparent. We use a fixed-price guide that reflects the time, materials, and real costs of running a dependable home services business. No hourly rates. No inflated prices based on where you live. We focus on what it takes to get the job done—not on how much we can charge.

Before we price your plumbing job, our licensed plumber will perform an in-home assessment to evaluate the tasks required. We only charge for what’s necessary—no fluff, no extra costs. This allows us to pinpoint areas where we can save you money without sacrificing quality.

Call Now

A:

We price the job—not the clock. Hourly rates can be unpredictable, leaving you unsure of the final cost until the job is done. We believe in upfront, fixed pricing based on the work itself—not guesswork. You won’t pay for delays or mistakes, and we hold ourselves accountable to ensure there are no surprises.

Call Now

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We prefer to price based on the job and not what other companies charge. Hourly rates can lead to unexpected costs for homeowners, making the final price unpredictable. By pricing the work itself, we make sure you’re only paying for what’s actually needed—keeping things fair and efficient.

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For an accurate quote, one of our licensed plumbers will inspect your existing system and provide a FREE estimate.

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Our phone staff are not licensed plumbers, so they can’t quote prices that would be accurate to your project’s needs. A trained plumber needs to see the job firsthand to give you a clear, upfront price. Quotes over the phone are a guess, and we prefer transparency over uncertainty.

Call Now

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Ballpark prices can be misleading. Until we see the job, we can’t quote your final estimate accurately. Other companies may give an estimate range, but that often leads to additional costs and surprises later. Instead, we focus on giving you a fair price once a licensed plumber can assess the job properly.

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We have a small dispatch fee to send our plumber to your home. They’ll arrive in a truck stocked with thousands of parts, ready to complete most jobs the same day. After a thorough evaluation, your plumber will explain the issue, walk you through the recommended fix, and show you your options and final price. No hourly rates. No surprises. Just a clear, upfront price before any work begins.

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Yes! We offer FREE in-home estimates for major projects like water heater installations, water softeners, and repiping—without any dispatch fee. Our licensed plumber will assess the job, explain your options, and provide a clear, fixed price. No surprises or hourly rates—just honest, reliable service. Schedule your FREE estimate today!

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