How to Fix a Water Heater That Is Leaking

A leaking water heater is not something to ignore. Even a small drip can lead to water damage, mold, or a complete tank failure. The good news is that many water heater leaks are fixable without replacing the entire unit — if you catch them early.

This guide helps you find where the leak is coming from and how to fix it.

Step 1: Find Where the Leak Is Coming From

Before you do anything, identify the source of the leak. Common leak locations include:

• The cold water inlet or hot water outlet connections (top of tank)
• The temperature and pressure relief valve (T&P valve)
• The drain valve (bottom of tank)
• The heating element gaskets (electric heaters)
• The tank itself

Dry the area around the heater with a towel, then watch carefully to see where water is dripping from.

Leak from the Top: Inlet/Outlet Connections

If water is dripping from the pipe connections at the top of the tank, the fittings may be loose or the thread seal has failed.

How to fix:

1. Turn off the water supply to the heater
2. Use a pipe wrench to tighten the connections
3. If tightening doesn't stop the leak, wrap the threads with PTFE thread seal tape and reconnect

💡 Recommended Tools: Mr. Pen 10-Inch Pipe Wrench — sturdy and reliable for pipe work.

💡 Recommended: Gasoila Yellow PTFE Thread Seal Tape — professional-grade, leak-proof seal for gas and water lines.

Leak from the T&P Relief Valve

The temperature and pressure relief valve is a safety device that releases water if pressure or temperature gets too high. If it's dripping, it could mean:

• The valve is doing its job (pressure is too high) — a plumber should check your system pressure
• The valve itself is faulty and needs replacement

How to replace the T&P valve:

1. Turn off power or gas to the heater
2. Turn off the cold water supply
3. Drain a few gallons from the tank using the drain valve
4. Unscrew the old valve and replace it with a new one
5. Wrap threads with PTFE tape before installing

💡 Recommended Part: Camco Automatic T&P Relief Valve — all brass body, stainless steel spring, reliable safety protection.

Leak from the Drain Valve

The drain valve at the bottom of the tank can leak if it's worn out or not fully closed.

How to fix:

1. Try turning the valve clockwise to make sure it's fully closed
2. If it still drips, the valve seat may be damaged — replace the drain valve
3. As a temporary fix, attach a garden hose to the valve and direct water to a drain

💡 Recommended: Flexzilla Garden Hose 50ft — lightweight, flexible, leak-free connections.

Leak from the Heating Element Gasket (Electric Heaters)

On electric water heaters, water can leak around the heating element if the gasket has deteriorated.

How to fix:

1. Turn off power at the breaker
2. Turn off the cold water supply and drain the tank
3. Remove the heating element and replace the gasket
4. Reinstall the element and refill the tank

💡 Recommended: EWH-01 Electric Water Heater Tune-Up Kit — includes replacement heating elements and thermostats for a complete fix.

Leak from the Tank Itself

If water is seeping from the tank body, the tank has corroded from the inside. This cannot be repaired — the entire water heater must be replaced.

Internal corrosion is usually caused by a failed anode rod. The anode rod is a sacrificial metal rod that protects the tank lining from rust. When it's depleted, the tank starts to corrode.

💡 Prevent future tank failure: RV Water Heater Anode Rod 2-Pack — replace your anode rod every 2–3 years to extend tank life.

If your tank is leaking and over 10 years old, consider upgrading to a tankless water heater for longer-lasting, more efficient hot water.

💡 Upgrade option: Rheem 18kW Tankless Electric Water Heater — no tank to corrode, endless hot water on demand.

When to Call a Professional

Call a plumber if:

• The tank itself is leaking (replacement required)
• You're not comfortable draining or working on the heater
• The leak is large or causing water damage
• System pressure is consistently too high

Summary

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