Plumber inspecting a leaking water heater in Murfreesboro

Why Is My Water Heater Leaking?

Your water heater may be leaking due to a loose connection, a faulty temperature and pressure relief valve, or a corroded tank. Internal tank failure, condensation, or a leaking pipe connected to the unit can also cause water to pool around the base. Identifying the source is the first step toward a solution.

Short Answer: Common Causes of Water Heater Leaks

Here are the 6 most common reasons your water heater is leaking:

Loose connections: Water inlet or outlet connections can become loose over time.
Faulty T&P valve: The temperature and pressure relief valve may be releasing water due to excessive pressure or temperature.
Corroded tank: Internal rust and corrosion can create pinhole leaks in the tank itself.
Condensation: Moisture can form on the outside of the tank, especially in humid conditions.
Leaking pipe: A nearby water line or pipe may be dripping onto or near the unit.
Drain valve: The drain valve at the bottom of the tank may not be fully closed or may be damaged.

Water pooling around the base of a leaking water heater

What This Means for Your Home or Business

A leaking water heater is more than just an inconvenience—it can cause significant water damage to your floors, walls, and belongings. Even a small leak can lead to mold growth, structural damage, and costly repairs if left unaddressed.

For businesses, a water heater leak can disrupt operations, create safety hazards, and lead to expensive downtime. Quick action and professional water heater repair are essential to minimize damage and restore your hot water supply.

Common Causes and Considerations

Understanding the source of the leak is critical to determining whether you need water heater repair or water heater installation. Here are the most common causes:

Loose Connections

Water inlet/outlet connections: Over time, the fittings where water enters and leaves the tank can loosen, causing drips.
Temperature and pressure relief valve: If this valve is faulty or the pressure is too high, it may release water.

Corroded Tank

Internal rust: As water heaters age, the inside of the tank can corrode, leading to pinhole leaks. This is often a sign that replacement is needed.
Sediment buildup: Sediment can settle at the bottom of the tank, causing the tank to overheat and develop weak spots.

Condensation

Moisture on the tank: Condensation can form on the outside of the tank, especially in humid conditions or when the water temperature is set too low.
Drain valve issues: The drain valve at the bottom of the tank may be leaking if it’s not fully closed or is worn out.

Other Issues

Leaking pipes: A nearby pipe connected to the unit may be dripping water onto the tank.
Flue or vent leaks: For gas water heaters, a leaking flue or vent can cause condensation that drips down the tank.

Close-up of a water heater drain valve leaking

Rust and corrosion inside a water heater tank

When to Contact a Professional Plumber

You should call a plumber immediately if your water heater is leaking, as the problem can worsen quickly. Turn off the water supply and power to the unit to prevent further damage, and contact a professional right away.

Contact a professional if:

There is standing water around the base of the water heater
The leak is large or getting worse
You notice rust or corrosion on the tank
The water is discolored or has a bad smell
Your water heater is more than 10 years old
You’re unsure about the source of the leak

A licensed plumber can safely diagnose the issue and recommend whether water heater repair or water heater installation is needed.

How Royalty Plumbing Can Help

Royalty Plumbing provides professional water heater repair and water heater installation services in Murfreesboro and the surrounding areas. Our experienced plumbers can quickly diagnose the source of your water heater leak and provide effective solutions, whether a simple repair or a full replacement.

We offer comprehensive water heater services, including:

Water heater repair for electric and gas units
Water heater installation and replacement
Tankless water heater installation
Water leak repair for pipes and connections
Plumbing repair for all systems
Emergency plumbing services

Plumber repairing a leaking water heater connection

Local Service Areas

Royalty Plumbing provides professional water heater repair and installation services to homeowners and businesses in Murfreesboro, TN, as well as Franklin, Brentwood, Spring Hill, Smyrna, La Vergne, Antioch, Nashville, and many other communities in Middle Tennessee.

Frequently Asked Questions

Can a leaking water heater be repaired?

Yes, some leaks can be repaired if the issue is a loose connection, a faulty valve, or a leaking pipe. However, if the tank itself is corroded or cracked, replacement is typically the only option. A professional plumbing company can assess the situation.

Should I turn off my water heater if it’s leaking?

Yes. Turn off the power supply (circuit breaker for electric, gas valve for gas) and shut off the cold water supply to the unit. This prevents further water damage and reduces the risk of electrical shock or gas hazards.

How do I know if my water heater tank is cracked?

Signs of a cracked tank include visible cracks in the tank, water pooling around the base, and rust or corrosion on the tank. If you suspect a cracked tank, call a plumber immediately for water heater installation or replacement.