Why Is My Water Heater Leaking?
A leaking water heater is usually caused by a faulty T&P relief valve, loose drain valve, corroded tank, or loose water connections. If water is leaking from the bottom of the tank, the tank itself has likely failed and needs replacement. Address any leak promptly to prevent water damage and mold growth.
Common Causes
Temperature & Pressure (T&P) Relief Valve
The T&P valve releases water when pressure or temperature gets too high, a safety feature. Some dripping is normal, but continuous flow means the valve may be faulty or your water pressure is too high.
Drain Valve Leak
The drain valve at the bottom of the tank is used for flushing sediment. If it's loose or the washer is worn, it will leak. This is often an easy fix, tightening or replacing the valve.
Corroded Tank
Phoenix's hard water accelerates tank corrosion, especially if the anode rod hasn't been replaced. Once the tank itself corrodes through, the unit cannot be repaired, replacement is the only option.
Loose Water Connections
Inlet and outlet connections at the top of the water heater can loosen over time. Check for dripping around the cold water inlet and hot water outlet pipes.
Internal Tank Failure
Tank water heaters have a glass lining that protects the steel tank. Hard water and heat cause this lining to crack over time, allowing water to contact the steel and cause leaks. This requires replacement.
Condensation (Not Actually a Leak)
When cold water enters a hot tank, condensation can form on the outside and drip to the floor. This is normal and should stop once the water heats up. It's more common in winter.
What Should You Do?
Try This First
- Identify exactly where the water is coming from, top, bottom, or sides
- Check if the T&P relief valve discharge pipe is dripping (some dripping is normal)
- Tighten the drain valve at the bottom if it appears loose
- Check inlet/outlet connections at the top for moisture
- Place a pan under the water heater to catch water and prevent floor damage
Call a Pro If...
- Water is coming from the bottom of the tank (likely tank failure)
- There's a large amount of water or it's pooling on the floor
- The T&P valve is continuously discharging water
- You see rust or corrosion on the tank
- The water heater is more than 10 years old
- You smell gas near the water heater (leave and call 911)