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Leaking Water Heater: Causes, Diagnosis, and What to Do Next


Image of leaking water heater

A leaking water heater can be a homeowner's nightmare, but it's crucial to address the issue promptly to prevent damage and ensure your family's safety. In this guide, we'll explore the causes of water heater leaks, how to diagnose the problem, and the steps to take when faced with a leaking water heater.


Common Causes of Water Heater Leaks:

  1. Pressure Relief Valve Leak: This valve is designed to release excess pressure from the tank. If it's leaking, it may indicate high pressure inside the tank or a faulty valve.

  2. Corrosion and Rust: Over time, the tank's interior can corrode, leading to tiny holes and leaks. This is a common issue in older water heaters.

  3. Faulty Drain Valve: The drain valve at the base of the tank may become loose or damaged, causing leaks.

  4. Faulty Temperature and Pressure (T&P) Relief Valve: If the T&P valve is malfunctioning, it can cause water to escape from the overflow pipe.

  5. Internal Tank Crack: A crack or hole in the tank itself can lead to significant leaks.

Diagnosing a Leaking Water Heater:

  1. Inspect the Area: Start by examining the area around the water heater for any visible signs of water.

  2. Check for Active Leaks: Carefully look for any water dripping from the tank or nearby pipes. If the leak is active, turn off the water to the water heater as well as the gas or power immediately.

  3. Turn Off the Power: For electric water heaters, switch off the power at the breaker box. For gas water heaters, turn off the gas supply.

  4. Shut Off the Water: Locate the cold water shut-off valve leading to the water heater and turn it off. This will stop the water flow into the tank.

Determining the Size of the Water Heater:

If you need to source a plumber or a new water heater, knowing the size of your current unit is essential. Look for a sticker on the front of the water heater that indicates the "tank capacity." Common sizes include 40 gallons, 50 gallons, and more. Additionally, determine if your water heater is Natural Gas, Propane or Electric. This information will help professionals recommend the right replacement unit.


Image of water heater information sticker


Adding a Water Leak Detection Device:

To enhance safety, consider installing an inexpensive water leak detection device near your water heater. These devices can alert you to leaks before they cause significant damage, potentially saving you from costly repairs.


Next Steps After Discovering a Leaking Water Heater:

  1. Call a Professional Plumber: Leaking water heaters often require expert attention. Contact a licensed plumber to assess the situation and recommend repairs or replacements.

  2. Evaluate Repair vs. Replacement: Depending on the extent of the damage and the age of the water heater, your plumber will help you decide whether it's more cost-effective to repair or replace the unit.

  3. Consider Safety: If there's a significant leak or damage to the electrical or gas components, prioritize safety. Evacuate the area and contact emergency services if necessary.

  4. Preventative Maintenance: After addressing the immediate issue, consider scheduling regular maintenance for your water heater to prevent future problems.

In conclusion, a leaking water heater should never be ignored. Prompt action is essential to avoid property damage and ensure your safety. By diagnosing the issue, turning off the power and water, and seeking professional assistance, you can address the problem effectively and make informed decisions about repair or replacement.


Remember that water heaters have a finite lifespan, and leaks can be a sign that it's time for a new unit. Regular maintenance and proactive measures, such as installing water leak detection devices, can help you avoid such inconveniences in the future.

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