Is a Leaking Water Heater Dangerous? Here’s What You Need to Know
A leaking water heater might start off as a minor annoyance—a few drips on the floor, maybe a small puddle near the base. But if you’re wondering, “Is a leaking water heater dangerous?” the answer is yes, it can be. A leak in your water heater doesn’t just waste water—it can lead to serious safety hazards, property damage, and costly repairs if left unaddressed.
Whether you’re dealing with a small drip or a steady stream of water, understanding the risks and urgency of a leaking water heater is crucial. Below, we’ll explore why leaks happen, what dangers they pose, and what you should do if your water heater is leaking.
What Causes a Water Heater to Leak?
Water heater leaks can develop for several reasons. Over time, sediment buildup, corrosion, and high internal pressure can compromise the tank or its fittings. Common sources of leaks include:
- Faulty temperature and pressure relief valve (T&P valve)
- Loose or damaged inlet/outlet connections
- Leaking drain valve
- Cracks or rust in the tank itself
In older water heaters, corrosion is one of the most common culprits. When the interior lining begins to break down, water can slowly seep through, leading to a leak that will only get worse over time.
Is It Safe to Leave a Leaking Water Heater On?
No, it’s not safe to leave a leaking water heater running. While it may seem harmless, keeping the heater on can make things much worse. A leak in the tank can increase pressure inside, especially if the heater is still actively heating water. This added pressure could lead to a rupture or even a tank explosion in rare but serious cases.
If you notice a leak, the first thing you should do is shut off the power supply to the unit. For electric water heaters, turn off the breaker at the electrical panel. For gas units, turn the gas control valve to the “off” position. Then, shut off the cold water supply line to prevent further flooding.
How Urgent Is a Leaking Water Heater?
A leaking water heater should always be treated as an urgent plumbing issue. Even a small leak can escalate quickly, leading to:
- Water damage to floors, walls, or nearby belongings
- Mold and mildew growth
- Structural weakening of your home
- Increased utility bills from wasted hot water
The leak itself might be a symptom of a bigger issue, like a failing tank. If your water heater is more than 10–15 years old, a leak often signals that the unit is reaching the end of its life. Delaying repairs or replacement could put your home at risk of more serious damage.
If you’re unsure whether the leak is urgent, it’s best to call a licensed plumber. Doug Herrell Plumbing serves Brevard County, including Melbourne, Palm Bay, and Viera, and we’re experienced in water heater repairs and replacements. Don’t wait—getting expert help could prevent a plumbing disaster.
Will a Leaking Water Heater Burst?
Yes, in some cases, a leaking water heater can burst—especially if the leak is due to internal corrosion or excessive pressure. When the tank structure weakens, it may no longer be able to handle the internal pressure that builds up during heating cycles.
One of the most dangerous situations involves a malfunctioning T&P valve, which is designed to release excess pressure. If this valve is broken or clogged, the pressure inside the tank may have nowhere to go. In rare but extreme cases, this could lead to a water heater explosion—something that’s been documented by safety agencies like the Consumer Product Safety Commission (CPSC).
A sudden burst tank can release 40 to 80 gallons of scalding hot water into your home, causing massive water damage and serious burn injuries.
Is a Leaking Water Heater Dangerous to Humans?
Yes, a leaking water heater can pose several health and safety risks:
- Burns from hot water exposure
If the leak is near the bottom or caused by a crack in the tank, the escaping water is often extremely hot. This could burn you or others nearby. - Mold exposure
A slow, persistent leak can lead to moisture buildup and mold growth, especially in hidden areas like under flooring or behind walls. Mold spores can trigger allergies, respiratory issues, and other health concerns. - Electrical hazards
In electric water heaters, water leaking near wires or electrical panels can cause shorts or even start a fire if not addressed quickly. - Slips and falls
Water pooling on the floor is an obvious slipping hazard, especially in tight utility closets or garage corners.
To protect yourself and your home, always treat a leaking water heater as a serious issue.
What Should You Do If Your Water Heater Is Leaking?
If you suspect or confirm that your water heater is leaking, here’s what you should do immediately:
- Turn off the power or gas
As mentioned earlier, shut off the electricity at the breaker panel or turn off the gas supply valve. - Shut off the water supply
Look for the shut-off valve on the cold water line going into the heater and turn it clockwise to stop water from entering the tank. - Drain the tank if necessary
If the tank is leaking badly, attach a garden hose to the drain valve at the bottom and direct it to a floor drain or outside. Open the valve carefully to let the water out. - Call a professional plumber
Even if the leak seems minor, a plumber can inspect the unit and advise whether a repair or replacement is needed.
If you’re in the Brevard County area and need fast help with a leaking water heater, Doug Herrell Plumbing can provide same-day service in most cases.
Can a Leaking Water Heater Be Repaired?
In some cases, yes. If the leak is coming from a valve, pipe connection, or the T&P valve, a licensed plumber may be able to repair or replace the part. However, if the tank itself is leaking due to corrosion or structural damage, replacement is usually the only safe and effective solution.
Modern water heaters are built with safety in mind, and many now come with warning systems or built-in sensors to alert you when there’s a leak. If your unit is older, though, it’s a good idea to consider upgrading before a small leak turns into a major disaster.
An Expert Plumbers Opinion On a Leaking Water Heater
So, is a leaking water heater dangerous? Absolutely. Even the smallest leak can lead to significant safety risks, costly home repairs, and even potential health hazards. From water damage and mold to electrical risks and tank bursts, it’s not something to ignore.
Act fast. Shut off the power and water, and contact a plumbing professional as soon as possible. If you’re located in Melbourne, Palm Bay, Viera, or surrounding areas of Florida, Doug Herrell Plumbing is here to help you handle water heater leaks safely and efficiently.
Need help now? Contact us today for expert plumbing solutions and peace of mind.
What’s Next?
Doug Herrell Plumbing is a trusted leader in Brevard County, Florida, specializing in slab leak detection and re-piping services. Call us today for a free estimate before a slab leak causes unnecessary damage to your property.
About Doug Herrell Plumbing – lic#CFC 048487
Doug Herrell Plumbing has been Brevard County’s source for plumbing services since 1980. We are a family owned and operated business and take tremendous pride in providing honest and reliable plumbing services at an affordable price.
CALL 321-254-0004
Serving Melbourne, Palm Bay, Viera, Suntree, Titusville, Merritt Island, Melbourne Beach, Indialantic, Indian Harbour Beach, Cape Canaveral, Satellite Beach, Rockledge, West Melbourne, Cocoa, and Cocoa Beach.
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