What to Do If You Have a Leaking Water Heater
A leaking water heater can range from a small drip to a major flood. Either way, it’s a problem you don’t want to ignore. Sometimes, water slowly pools around the base of the tank, while other times the leak is so severe you’re forced to act quickly. Understanding the causes of water heater leaks and knowing what steps to take will help you prevent costly water damage.
First Steps When You Notice a Leaking Water Heater
If you spot a small puddle, wipe up the water with a towel and check again in a few hours. If the water does not return, it may have been condensation or an isolated issue. Keep monitoring to make sure it doesn’t happen again.
If you notice ongoing water or a major leak, follow these steps immediately:
Shut Off the Water Supply to the Leaking Water Heater
Look for the shut-off valve near your water heater and close it. If that’s not accessible, use your home’s main water shut-off valve to stop water flow.
Turn Off the Power Supply to the Leaking Water Heater
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For electric heaters, switch off the circuit breaker powering the unit.
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For gas heaters, turn the gas control switch to “off.” You can also close the gas valve, but be cautious, as repeated use can cause damage. If you’re unsure, call a professional.
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Locate the Source of the Leak
Identifying where the water is coming from helps determine whether the problem is a simple repair or if the entire heater needs to be replaced.
Common Causes of a Leaking Water Heater
Leaks can occur in several places. Check these common trouble spots:
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Inlet and outlet connections – Found at the top of the heater where pipes connect. If leaking, tightening the fittings with a wrench may solve the problem.
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Temperature and pressure relief valve (T&P valve) – Located at the top or side of the tank, this valve relieves excess pressure. If it’s constantly releasing water, the valve may be worn out or your water temperature may be set too high. The U.S. Department of Energy recommends keeping water heaters at 120°F.
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Tank – If water consistently pools at the bottom, the tank itself may be corroded. Unfortunately, once the tank begins leaking, the unit usually needs to be replaced.
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Drain valve – Located near the bottom, this valve is used during maintenance to flush the tank. If it isn’t fully closed, water may leak out. Tighten the valve and check if the leak stops.
When to Call a Plumber for a Leaking Water Heater
Some leaks are quick fixes, but many require professional repair or full replacement. If you cannot stop the leak, or if the tank itself is damaged, it’s best to call a licensed plumber right away. Ignoring a leaking water heater can lead to mold, structural damage, and expensive repairs.
Bieg Plumbing & Mechanical: St. Louis Leaking Water Heater Experts
Whether you need a water heater repair or a full replacement, Bieg Plumbing & Mechanical has been helping St. Louis homeowners for over 60 years. Our certified plumbers can quickly diagnose the issue and recommend the most cost-effective solution.