A leaking water heater can be a small repair, or it can be a sign that the tank is failing. The key is to act quickly, limit water damage, and figure out where the leak is coming from.

If you see water around your water heater, here’s what to do first.

1. Shut off the water supply

Look for the cold water shut-off valve above the water heater. Turn it clockwise until it stops.

This stops new water from continuing to feed into the tank. If the valve is old, stuck, or leaking, do not force it too hard. You may need to shut off water to the house instead.

2. Turn off the gas or electricity

If you have a gas water heater, turn the gas control knob to the pilot setting.

If you have an electric water heater, turn off the breaker at the electrical panel.

This helps protect the system while the leak is being inspected. For electric water heaters especially, the power should be off before anyone works on the unit.

3. Check where the leak is coming from

You do not need to take anything apart. Just look carefully around the unit.

A leak from the top of the water heater may be coming from the hot or cold water connections, flex lines, nipples, or shut-off valve. These leaks are often repairable.

A leak from the temperature and pressure relief valve, also called the T&P valve, may mean the valve is failing, the water pressure is too high, the temperature is too high, or the expansion tank is not working properly.

A leak from the drain valve near the bottom of the tank may be caused by a loose, damaged, or worn-out valve.

A leak from the bottom of the tank is usually the worst sign. If water appears to be coming from underneath the water heater itself, the inside of the tank may have rusted through. In that case, the water heater usually needs to be replaced.

4. Do not ignore a slow leak

Even a small leak can cause drywall damage, flooring damage, mold, or damage to nearby storage items. A leaking tank can also get worse quickly.

If your water heater is in a garage, closet, attic, or interior utility space, the risk of water damage can be much higher. It is better to deal with the leak early than wait for a full failure.

Can a leaking water heater be repaired?

Sometimes, yes.

Leaks from fittings, valves, flex lines, expansion tanks, or nearby plumbing can often be repaired without replacing the entire water heater.

But if the tank itself is leaking, the unit cannot be repaired. Once the steel tank has failed internally, replacement is the only proper solution.

When replacement makes more sense

Most traditional tank water heaters last about 8 to 15 years, depending on water quality, maintenance, installation conditions, and usage.

If your water heater is older and leaking from the tank, replacement is usually the safest and most cost-effective choice. Putting money into small repairs around an aging unit may not make sense if the tank is close to failure.

A licensed plumber can confirm whether the leak is coming from a repairable part or from the tank itself.

Water Heater Boys can help

Water Heater Boys inspects leaking water heaters throughout the Bay Area. We can determine whether the unit can be repaired or whether replacement is the better option.

We handle gas, electric, tankless, and hybrid water heaters, including same-day replacement when available.

There is no service call fee for a water heater inspection. You will get a clear answer, practical options, and straightforward pricing.

Need help with a leaking water heater?

Call Water Heater Boys for a fast inspection.

We will check the source of the leak, explain what is happening, and help you decide whether repair or replacement makes the most sense.