Why Is My Water Heater Leaking?
Water heater leaks come from a few key components — the T&P valve, drain valve, inlet/outlet connections, or the tank itself. Here's how to identify 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 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.
Frequently asked questions
Should I turn off my water heater if it’s leaking? For a significant leak, shutting off the water supply to the heater (and the power or gas) limits damage until it’s repaired. For a minor drip, locate the source and call for service.
Can leaks be fixed, or do I need a new heater? It depends on the source. Valve and fitting leaks are usually repairable; a leaking tank requires replacement.
How long do water heaters last? Tank units typically last 8–12 years. A leak on an older unit often signals it’s time to replace rather than repair.
Don’t let a small leak become a flooded floor. Learn about our water heater service, or contact us 24/7.
General guidance only; have a licensed professional diagnose and repair the leak.