Water Heater Leaking? Here’s What to Do Immediately

A leaking water heater isn’t just a nuisance—it’s a plumbing emergency. Whether you’ve discovered a small puddle beneath the unit or noticed consistent dripping from the tank, acting quickly can be the difference between a simple repair and costly water damage. For homeowners in Bohemia, NY, and surrounding Suffolk County areas, this is a common issue, especially with aging water heaters or during cold months.

At Mike the Plumber, we regularly respond to calls about leaking water heaters. We understand the urgency and the risks that come with delay. In this blog, we’ll guide you through the immediate steps you should take when you notice a leak, the potential causes behind it, and how our team can step in to provide fast, reliable solutions.

Step One: Turn Off the Water Supply

If your water heater is leaking, the very first thing to do is shut off the water supply. Most water heaters have a shutoff valve on the cold water line above the tank. If this valve is a wheel, turn it clockwise. If it’s a lever, turn it perpendicular to the pipe.

This step prevents further water from entering the tank and leaking out, minimizing damage to your floor or surrounding area. If the valve is stuck or inaccessible, you can shut off the main water supply to your home until a plumber arrives.

Step Two: Cut the Power or Gas Supply

Once the water is off, cut power to the water heater. For electric models, switch off the breaker labeled “water heater” in your electrical panel. For gas units, turn the gas control valve to the "off" position. Safety is critical—never attempt to inspect or repair a water heater while it’s powered.

If you suspect a gas leak or smell gas, evacuate the area and call your utility provider immediately. A leaking water heater is bad, but a gas-related incident is far worse.

Step Three: Identify the Leak Source

Before calling a professional, you can do a quick inspection to locate where the water is coming from. This helps you understand the severity and urgency of the issue.

Water leaking from the top of the tank may indicate issues with the inlet or outlet connections, the temperature and pressure relief valve (T&P valve), or even condensation. A leak near the bottom usually points to a failing tank—a more serious issue that often requires replacement.

If you notice water around the base of the tank but can’t pinpoint a specific leak, it could be coming from the internal liner, which means the unit has reached the end of its lifespan.

Step Four: Drain the Tank (If Safe to Do So)

If the leak is significant and you’re waiting for help, draining the tank can reduce the risk of water damage. Attach a garden hose to the drain valve at the bottom of the tank and lead the other end outside or to a floor drain. Open the valve slowly and allow the water to empty. Be cautious—water inside the heater may still be hot.

If you’re unsure about this step or feel unsafe performing it, wait for a licensed professional. At Mike the Plumber, we’re equipped to handle all types of leaking water heater emergencies.

Common Causes of a Leaking Water Heater

Understanding why your water heater is leaking can help you avoid future issues. Some causes are minor and repairable. Others signal it’s time to replace the unit.

Loose Connections

 Over time, fittings and joints can loosen due to pressure and thermal expansion. This can cause small but persistent leaks around the inlet or outlet pipes.

Faulty T&P Valve 

The temperature and pressure relief valve is a safety feature that opens when pressure gets too high. If it’s stuck or worn out, it may leak intermittently or continuously.

Sediment Buildup

 Hard water deposits accumulate at the bottom of the tank over the years. This buildup causes hot spots that damage the tank lining, leading to slow leaks or bursts.

Corrosion and Age

 If your water heater is 10–15 years old, internal corrosion can eat away at the tank. When the inner lining fails, there’s no repair—only replacement.

Cracked Drain Valve 

The drain valve near the base of the heater may crack due to overtightening or impact. This can cause a slow, steady drip that worsens over time.

Improper Pressure Levels

 Excessive water pressure from the main supply can overwhelm the tank and its components. A pressure-reducing valve can help prevent future problems.

For homes in Bohemia and neighboring towns like Ronkonkoma, Sayville, and Medford, we often see a mix of older systems, hard water, and poorly maintained heaters as the main contributors to leaks.

Risks of Ignoring a Water Heater Leak

Ignoring even a small leak can lead to significant issues. Water can seep into flooring, walls, and nearby appliances. Over time, this moisture promotes mold and mildew growth, which can affect indoor air quality and your family’s health.

In multi-story homes, a leaking water heater installed on an upper level can damage ceilings and insulation below. In basements, it can soak storage areas and damage structural supports. The financial costs of restoration far exceed the cost of a quick plumbing repair.

Some homeowners wait, hoping the leak will stop on its own. Unfortunately, water heater leaks rarely resolve without intervention. If the internal tank is compromised, the entire unit could rupture, flooding your space with dozens of gallons of hot water.

How We Handle Water Heater Leaks at Mike the Plumber

At Mike the Plumber, we take leaking water heaters seriously. Our licensed plumbers arrive with the tools and parts needed to address the issue immediately—often during the first visit.

We begin with a full inspection, using non-invasive tools like moisture detectors and thermal cameras to locate and evaluate the leak. If the leak is due to a faulty valve, loose connection, or worn fitting, we’ll make repairs on the spot.

If the tank itself is leaking, we’ll discuss replacement options and provide an honest, upfront quote. We carry a range of energy-efficient models and can often complete installations the same day. See our water heater gallery for examples of past projects.

Our goal is to solve the issue quickly, cleanly, and permanently—so you can get back to daily life without worrying about water damage or cold showers.

DIY Fixes: What You Can Safely Try

There are a few temporary steps homeowners can take if a plumber can’t arrive right away:

• Tighten visible pipe connections gently

• Place a bucket under small drips to contain water

• Use plumber’s tape to seal minor valve leaks temporarily

But keep in mind: These are not long-term solutions. Attempting to repair a leaking tank yourself, especially without shutting off power or water, can be dangerous.

It’s always best to contact a professional plumber. Our team is available across Suffolk County and can help you understand whether repair or replacement is the right move.

Do You Need a New Water Heater?

If your unit is older than 10 years, leaks from the base, or no longer meets your household’s hot water demands, it may be time for a replacement. We’ll help you choose between tank and tankless models and ensure the new system is properly sized and installed.

At Mike the Plumber, we provide a full range of services, including drain cleaning and slab leak detection, so no matter the cause or extent of your water issue, we’re equipped to help.

Why Choose Mike the Plumber for Water Heater Leak Repairs?

Homeowners across Bohemia and Suffolk County trust Mike the Plumber because we take plumbing emergencies seriously. A leaking water heater isn’t something that can wait—and we don’t make you. From the moment you call, we prioritize fast response, honest communication, and high-quality workmanship.

Our team is fully licensed, insured, and experienced in working with all types of water heaters—gas, electric, tank, and tankless. We understand the plumbing systems in homes from Ronkonkoma to Sayville, Holbrook to East Islip, and we bring local knowledge that makes a difference.

What sets us apart is how we treat your home. We respect your time and your space. That means no mess left behind, no rushed repairs, and no hidden fees. Just straightforward, dependable service. From quick valve fixes to full water heater replacements, we’re here to make your plumbing problems disappear.

To get started or ask questions, visit our contact page or explore our full range of services.

Conclusion

A leaking water heater is never something to ignore. Even a small puddle can lead to structural damage, mold growth, and expensive repairs if left unchecked. Whether it’s a minor connection issue or a full tank failure, taking quick action protects your home—and your budget.

At Mike the Plumber, we’re here to help you act fast. We don’t just fix leaks; we solve the problem at its source and ensure your water heating system is safe, efficient, and built to last.

If your water heater is leaking, contact us today. We’ll assess the issue, explain your options, and provide a solution that gives you lasting peace of mind.

FAQs – Water Heater Leaks

1. What should I do first if my water heater is leaking? 

Turn off the water supply to the tank and shut off the power or gas. This helps prevent further damage and keeps your home safe.

2. Is it dangerous if my water heater is leaking?

 It can be. Water leaks may damage floors or walls, and in some cases, lead to mold or electrical hazards. It's best to call a licensed plumber immediately.

3. Can a leaking water heater be repaired, or does it need replacement? 

It depends on the cause. Valve leaks or loose fittings can often be repaired. If the tank itself is leaking, it usually requires replacement.

4. How quickly can you respond to a leaking water heater in Bohemia? 

We offer fast and often same-day service for urgent issues. Our team is based locally and responds quickly across Suffolk County.

5. Will I have to be without hot water during the repair? 

Possibly for a few hours, depending on the repair. We work efficiently to minimize downtime and keep your home running smoothly.

6. What if the leak is from the top of the tank? 

This usually means a faulty valve or pipe connection. These are typically easier and less expensive to fix than a tank leak at the base.

7. Do you also install new water heaters?

 Yes. We install both tank and tankless models and help you choose the best fit for your household needs.

8. Can you inspect other plumbing systems while you're here?

 Absolutely. We offer full inspections and additional services like drain cleaning and slab leak detection.