By A leaking water heater is one of those problems that no homeowner wants to face, yet it’s surprisingly common. Even a small leak can lead to water damage, mold growth, or higher utility bills if left unaddressed. Understanding why your water heater is leaking—and what steps you should take next—can save you time, money, and frustration.
Common Causes of Water Heater Leaks
1. Loose or Faulty Connections
Sometimes, the issue is as simple as a loose pipe fitting or valve. The cold-water inlet or hot-water outlet connections may weaken over time, allowing water to seep out. These problems are usually quick fixes but should still be handled promptly to avoid bigger issues.
2. Faulty Temperature and Pressure Relief Valve (T&P Valve)
Your water heater’s T&P valve is a safety feature designed to release excess pressure. If this valve becomes faulty or if the water pressure is too high, it can cause leaks. This is a sign that your system may need adjustment or replacement parts.
3. Corrosion in the Tank
Over time, sediment buildup and wear can cause the inside of a water heater tank to corrode. Once corrosion eats through the metal, leaks are inevitable. Unfortunately, if this is the case, repairing the tank isn’t an option—replacement is usually the only solution.
4. Cracks in the Tank from Heat Stress
When water is heated and cooled repeatedly, the metal tank expands and contracts. This constant stress can lead to cracks, which allow water to escape. If your tank has developed cracks, a new water heater will be necessary.
5. Drain Valve Issues
The drain valve, located near the bottom of the tank, is used to flush out sediment. If it becomes faulty or isn’t fully closed, you may notice leaks around this area. This is often an easy fix but needs attention right away to prevent ongoing water loss.
What to Do if Your Water Heater Is Leaking
- Turn Off the Power Supply
- For electric heaters, switch off the breaker.
- For gas heaters, turn the gas control knob to “off.”
- Shut Off the Water Supply
Locate the cold-water shutoff valve on top of the water heater and turn it clockwise to stop the flow of water. - Determine the Source of the Leak
Check connections, valves, and the tank itself. If you’re unsure, it’s best to call a professional plumber for an accurate diagnosis. - Clean Up Water Promptly
Use towels or a wet-dry vacuum to remove standing water to avoid damage to floors and walls. - Contact a Professional for Repair or Replacement
A minor issue may only require tightening a fitting or replacing a valve. However, if the tank itself is leaking, you’ll need to replace the unit entirely. Many homeowners take this opportunity to upgrade and consider tankless water heater installation, which offers long-term efficiency and continuous hot water.
A leaking water heater is never something to ignore. Whether it’s caused by a loose valve, corrosion, or internal cracks, acting quickly will help prevent costly damage. By understanding the causes and taking the right steps, you’ll be better prepared to protect your home and restore reliable hot water.