Is a Leaking Water Heater Dangerous?

Of all the hidden hazards lurking around the house, the humble water heater may not seem like much of a threat. However, the dangers of a leaking hot water tank go far beyond annoying water stains or patches of mold. A major tank failure can wreak havoc on your home and even put your safety at risk.

That’s especially bad news for homeowners in Birmingham, where many houses have older water heaters installed in damp, corrosion-prone garages or basements. The hard water in Central Alabama only exacerbates matters, further increasing the risk of leaks and failures. To see why this is such a big deal, let’s dive into what happens when a water heater fails — and what you should do about it.

Quick Takeaways

• Water heater leaks raise a litany of risks, from mold and water damage to shock, fire and scalding burns.
• Small leaks often indicate hidden tank failures that may eventually lead to much bigger leaks.
• Leaky gas water heaters pose increased risks of fire and carbon monoxide exposure.
• Electric water heater leaks can cause shorts that spark fires or deliver severe shocks.
• The longer a leak is ignored, the more you’re likely to pay in repair or replacement costs.
• Active leaks of any size should always be inspected by a licensed plumber right away.

What Makes a Leaking Water Heater Dangerous?

The average water heater tank stores about 50 gallons of water at temperatures up to 140° F. That’s a lot of potential for trouble, and the consequences of a leak can be expensive and downright dangerous.

Mold and Water Damage

Contrary to popular belief, your water heater doesn’t have to be gushing like a fire hydrant to inflict heavy property damage. Over time, even small leaks can release enough water to ruin flooring and furnishings, soak through insulation and damage walls and subfloors. Of course, a “slow” leak can also turn into a full-on flood in the blink of an eye.

Once a leak begins to spread, mold and mildew usually aren’t far behind. Nor are pests like termites and roaches, which are drawn like magnets to areas of high moisture.

Electrical Shock and Fire

Any situation that combines water and live electricity is an electrocution risk, and a leaky electric water heater does just that. Not only can the unit itself short out and deliver a nasty jolt, but standing water can easily infiltrate nearby outlets, extension cords and other electrical devices. Once this occurs, the slightest touch can produce a painful, potentially life-threatening shock.

If a leak forms a connection between energized components, it can also generate enough heat to spark an electrical fire. This threat may be higher for water heaters located in a basement or garage, where flammable materials are more likely to be stored nearby.

Scalding and Burn Risks

Water heater leaks come in many forms, from slow and subtle to sudden and dramatic. Among the most frightening are those involving the hot outlet connection, where a burst pipe or failed fitting can produce a pressurized spray hot enough to burn skin in an instant. Water leaking onto heated internal components can also flash into steam without warning, releasing a blast of scalding vapor.

Water dripping from loose connections or discharging from the temperature and pressure (T&P) relief valve may be extremely hot as well. These leaks are also less visually threatening and harder to spot, making them particularly hazardous to curious children and pets.

Gas Water Heater Hazards

For homes with gas water heaters, there’s another important reason not to mess around with leaks. If water seeps into the burner, it can inhibit or interfere with the normal combustion process. This can cause a variety of issues, from sluggish and inconsistent heating to wasted gas and excessive soot buildup.

Over the longer term, persistent leaks may corrode and damage parts of the unit’s venting system. Left unchecked, this increases the risk of carbon monoxide and other noxious combustion gases spreading into the home.

Tank Rupture and Pressure Failure

Heating water inside a sealed tank generates a lot of pressure, which is why all water heaters come equipped with a T&P relief valve. By automatically releasing water if the temperature or pressure climbs too high, the T&P valve relieves stress and helps to protect the tank. This is an essential last line of defense, but it’s not entirely foolproof.

Corrosion and sediment buildup can render the relief valve ineffective, allowing the pressure to continue rising unchecked. As the strain on the tank increases, water may start leaking from the weakest points. In rare cases, sufficient pressure can eventually trigger a violent and catastrophic rupture.

Common Causes of a Leaking Water Heater

Identifying the cause of a water heater leak isn’t always easy, but it often comes down to a few common culprits. These include:

What To Do Immediately if Your Water Heater Is Leaking

Discovering a water heater leak can be alarming, but knowing the right steps to take can help you limit the damage and keep everyone safe. Time is of the essence, so here’s what you need to do.

1. Shut Off the Power

Your immediate priority after spotting a leak should be shutting down the water heater to render it safe. For electric units, that means finding and flipping the correct circuit breaker in your service panel. If you have a gas-burning system, look instead for a fuel shut-off valve located on the pipe feeding into the heater.

2. Close the Water Valve

Once your water heater’s no longer running, locate and close the water shut-off valve. It’s usually attached to the cold water inlet at the top of the unit. Shutting this valve prevents more water from entering the heater, ensuring the leak doesn’t continue spreading.

3. Check for Possible Hazards

Be wary of any pooling water around your heater. Water is a fantastic conductor, so keep your distance from outlets and other nearby electrical sources. If you smell gas or hear hissing coming from your water heater, leave immediately and call for help.

4. Do NOT Attempt Temporary Fixes

There are some minor plumbing problems you can safely try fixing on your own. A leaking water heater is not one of them. Not only are quick fixes like plumber’s putty and epoxy often ineffective, but attempting DIY repairs can be dangerous and potentially make the situation worse.

5. Call a Licensed Plumber

Relying on a faulty or improperly repaired water heater is a gamble that’s simply not worth taking. Contact a qualified pro to ensure the problem is accurately diagnosed and your equipment is properly repaired or replaced

FAQ: Leaking Water Heater Safety Questions

Is a leaking water heater an emergency?

Absolutely. Even a small leak may indicate a tank on the verge of failure, posing risks of significant water damage, mold growth and scalding. There may be fire and shock hazards as well, especially if leaking water comes into contact with electrical components or fixtures.

Can a leaking water heater explode?

Explosions are exceedingly rare, but they do occur occasionally in old or poorly maintained units. This typically happens when the T&P relief valve wears out or becomes corroded, allowing the internal pressure to build until it ruptures the tank. The superheated water inside then instantly turns to steam, creating a tremendous explosion.

Is it safe to use hot water if the heater is leaking?

No. Even if a major failure doesn’t seem imminent, there’s no reason to take chances. The safest option is always to shut off water and power to the unit and wait for a plumber to arrive.

Will homeowners insurance cover water heater leaks?

Possibly, but you’ll need to prove the failure wasn’t caused by neglect. As soon as possible, take photos or videos clearly showing the leak and any resulting damage. Provide these to your insurance company along with maintenance records and a written diagnostic report from your plumber.

Why Trust Benjamin Franklin Plumbing for Water Heater Repairs

If your hot water has suddenly sprung a leak, you’re officially on the clock. A malfunctioning water heater can turn dangerous in a hurry, so make every minute count with Birmingham’s punctual plumbers.

At Benjamin Franklin Plumbing, we’re proud to offer fast, high-quality water heater repair and replacement services throughout Birmingham and surrounding areas. We’re always eager to help, so call now to connect with the on-time experts you can trust!