Why Is My Water Heater Leaking?
Water heater leaks come from a few key parts — the T&P valve, drain valve, connections, or the tank itself. Here's how to find the source and what it means.
Your water heater is leaking because of a failure in one of its key components — most often the temperature-and-pressure (T&P) relief valve, the drain valve, the inlet/outlet connections, or, most seriously, the tank itself. Identifying which one determines whether you’re facing a simple repair or a replacement.
Where do water heater leaks come from?
The T&P relief valve. If water is coming from the relief valve or its discharge tube, the valve may be releasing excess pressure or temperature (a real issue to address) or the valve itself may be worn. Never cap this valve.
The drain valve. The valve at the bottom used for flushing can loosen or fail and drip. Often repairable or replaceable.
Inlet and outlet connections. The hot and cold water connections at the top can loosen over time, especially with thermal expansion and contraction. Tightening or resealing a fitting may resolve it.
The tank itself. If the steel tank has corroded through, water leaks from the body — and a leaking tank can’t be repaired, only replaced. This is the failure mode you most want to catch early.
How to find the source
Look closely at where the water originates. Dripping from a top connection points to a fitting; water from the relief valve points to pressure/temperature or the valve; water from the base could be the drain valve, condensation, or the tank. Drying everything and watching where water reappears helps pinpoint it.
What it means for repair vs. replacement
A leaking valve or fitting is usually a repair. A leaking tank means replacement — and if your unit is also past 8–12 years, replacement is the smarter long-term move regardless. We’ll show you both options honestly.
When to call a professional
Any active leak should be addressed promptly to prevent water damage. A plumber can identify the source, make the repair, or recommend a properly sized replacement. Know where your water shutoff is in case the leak grows.
Don’t let a small leak become a flooded floor. Learn about our water heater service and leak detection, or contact us 24/7.
General guidance only; have a licensed professional diagnose and repair the leak.
Frequently asked questions
- Should I turn off my water heater if it's leaking?
- For a significant leak, yes — shut off the water supply to the heater, along with the power or gas, to limit damage until it's repaired. For a minor drip, try to locate the source and call for service. Either way, know where your home's water shutoff is in case the leak grows.
- Can a water heater leak be fixed, or do I need a new heater?
- It depends on the source. Leaks from the T&P relief valve, drain valve, or the inlet and outlet connections are usually repairable. A leak from the steel tank itself means replacement — a corroded tank can't be patched, and it only gets worse until it fails completely.
- How long do water heaters usually last?
- Tank water heaters typically last 8 to 12 years, and central Oklahoma's harder water can push them toward the shorter end of that range. If a leak shows up on a unit that's already past that age, replacement is usually the smarter long-term move than another repair.