Water Heater Leaking? 5 Steps Easy Fix

Signs your water heater is leaking and what to do about it.

In the US, water leaks in the average home waste 10,000 gallons per year. Worse, 10% of US households have plumbing issues so bad they waste 32,850 gallons each year. So, if you’ve noticed your water heater leaking or dripping, it’s best to get to the bottom of the issue ASAP. The sooner you do, the sooner you get to save water, money, and even the water tank itself.

Water damage can be tough to repair and cost a lot of money. Ready to put a stop to your hot water heater leaking water and wasting so much money?

Determine If You Have a Water Heater Leak

Sometimes, a water heater tank that seems to leak isn’t letting its contents go to waste. It can be moisture from the air that has condensed and formed water droplets on the outside surface of the tank.

To confirm if you have a faulty tank (or any other possible leak), conduct a whole-house leak check. You can do this by monitoring your water meter. In many homes, the water meter is outside, on the curb in front of the property. In some, the gauge is in the basement, along the lower section of a wall, and near the floor junction.

Once you find the meter, have everyone at home stop using the water as you run the test. Be sure to completely shut all the taps, toilets, fixtures, and water appliances. Your meter should have stopped moving at this point.

Confirm If It’s Your Hot Water Heater Leaking

Water Heater Leaking
Water Heater Leaking

To determine if it’s your electric or gas water heater leaking, wipe the tank dry first. Then, for your safety, be sure to shut the tank’s power and don protective gloves.

Next, clean the valves as well as the supply lines. Aside from the tank itself, these parts can also develop problems that may lead to leaks.

Once the tank is all clean and dry, pay close attention to its exterior. If moisture develops evenly throughout the surface, then that’s likely condensation.

If you see only the water heater valve leaking, then that’s a surefire sign you have a tank problem. The same goes if water seeps out of a specific spot of the tank or its water supply line.

In some tanks, the damage can be super small that it may take time for the water to seep out. If you don’t see immediate leaks, cover the area right under the tank with some paper towels. Check them for signs of dampness every couple of hours. If the towels do become moist or wet, chances are, you have a water heater leaking problem.

If the water heater is leaking from bottom, this is normal since any leak will find is way to the bottom of the tank inside the housing.

How to Repair Your Water Heater Leak

Close the Tank’s Water Supply Valve (Turn off the water)

Once you’ve confirmed that your tank does leak, the next step is to close its shut-off valve (shut off the water). This stops more cold water from flowing into the tank. If you had to switch the heater back on, be sure to turn off the power again before working on the shut-off valve.

In most tanks, the shut-off valve is right above the water heater, installed on the cold water supply line. This may either be a gate valve that you need to turn or rotate or a handle that you can easily pull down.

Fix the Leak

Depending on the severity and the location of the leak, you may be able to carry out a few DIY fixes.

If your water heater is leaking from the top, this might be a good news for you. The easiest to repair are leaks in water connections. Prepare yourself, though, as you may have to call a licensed plumber for more significant, more severe issues, such as tank leaks.

Leaking Water Connections

The two pipes connected to your tank top are the cold water inlet and hot water outlet. Since water continuously flows in and out of these lines, they can become loose or detached over time. If this is where your water heater leaks from, then you may only have to fasten the loose connections. Make sure you check both the inlet and outlet for a leak.

A pipe wrench should do the trick. But, again, be sure that your water heater doesn’t have power before you secure the connections. This is especially important if it’s the hot water outlet that you need to deal with.

Water heater leaking - Inlet cold water pipe leaks
Cold Water inlet pipe leaking

A Leaking Drain Valve

The valve near the bottom of your water heater tank is the “drain valve.” This is the component that lets you drain your tank for maintenance purposes. Speaking of which, you should flush and clean your tank at least once a year to get rid of sediment buildup.

Like all other connections, the drain valve can also become loose over time. If you’ve seen your water heater leaking from this part, tighten it slightly with a pipe wrench. Be sure to do this slowly to avoid overtightening the valve, which can lead to the leak getting worse.

If the water heater is still leaking, you may need to replace the valve. This is a more complex job, so it might be best to leave it in the hands of a professional plumber.

Water heater leaking - drain valve leak
Water Heater Drain Valve Leaking

A Leaking Temperature & Pressure Relief Valve

Your water heater comes with a temperature and pressure relief valve (T&P Valve). It’s a device that lets steam or water exit the tank to avoid a buildup of excessive temperature or excessive pressure. It should do its job if the temperature inside the tank exceeds 210 degrees or if the pressure goes beyond 150 psi.

Because it’s a valve, this component of your water heater is also susceptible to leaks. One way that this can happen if it gets stuck in a partially-open position. If it becomes defective, it may allow water to flow out of the pipe it connects to.

In this case, your best and safest bet is to call a plumber. After all, you’re dealing not only with leaks but also temperature and pressure. A slight mistake can cause severe health and safety hazards.

Water heater leaking - pressure and temperature relief valve
Water Heater Pressure Relief Valve Leaking

A Leaking Water Heater

Insulative materials cover the internal tank of a water heater. An outer skin then wraps around this entire part. If the inner part starts to leak, the most common symptom would be a leak that escapes from the bottom of the tank.

If this is the root cause of your water heater woes, then you’d need to replace the water heater. Unfortunately, these leaks are often non-repairable, as they’re usually a sign of deterioration.

Preventing Water Heater Leaking

Even if internal tank leaks are inevitable, the good news is that you can postpone them. With routine and preventative maintenance, you can make your water heater last longer.

Here are a few ways to delay the onset of costly internal water heater leaks :

Install a Powered Anode Rod to Prevent Water Heater Leaking

If you had a water heater leaking because of corrosion or you don’t want that to happen, we suggest installing a Corro-Protec powered anode rod. This anode uses current to protect against corrosion and Reduce Limescale buildup inside the tank. Only 12 inches long, this rod is easy to install and has a 20-year warranty, so you don’t need to worry about your water heater rusting ever again. 

Corro-Protec anodes have been on the market for over 20 years and are now protecting over 70 000 water heater all around North America.

Replace the Magnesium Anode Rod Before It Completely Corrodes

Inside your water tank is a sacrificial part called “sacrificial anode rod.” In any case, an anode rod sacrifices itself to protect the interior of a water heater tank. It attracts elements in the water that can corrode and destroy the other metal parts of the tank.

You can think of the anode rod as a magnet. It draws in minerals and metal ions that can otherwise cause oxidation and rust in the heater.

If you don’t install a powered anode rod or never change your magnesium rod, you will have a water heater leaking in your home after only a couple of years.

Sacrificial magnesium anode rod is hard to install and doesn’t last long (only last 2 or 3 years). They are called sacrificial because they sacrifice themselves to protect the tank. Because of its purpose, an anode rod has a shorter life than the entire tank. This is also why you need to replace the anode rod before it gets completely eroded.

Don’t Forget to Maintain Your Water Heater

If you don’t want to deal with a water heater leaking in the future, make sure you are doing a proper maintenance. Aside from draining your water heater and change the anode once a year, be sure to give all its parts a thorough cleaning too. Wipe your tank’s exterior as well as its valves and water connections. This way, you can get rid of dust and debris build-up, which can contribute to reduced performance.


  1. Dan on January 22, 2022 at 5:41 pm

    My tank is leaking right below the electrical panel on the side of the tank.

    • Corro-Protec on January 24, 2022 at 8:42 am

      looks like you’ll need to replace your water heater since it’s leaking

  2. Anna on July 6, 2021 at 6:09 am

    My water heater leak form the bottom I’m not sure what to do about that except calling a plumber to buy a brand new one? I tried to drain the water but it’s still leaking after that.

    • Corro-Protec on July 6, 2021 at 8:11 am

      The way the water heater is designed will always make it looks like it’s leaking from the bottom. Since there is housing on top of the insulation, water will stay inside the housing and leak at the bottom. If you verified the water inlet and outlet, t&p valve, and fittings, and everything looks normal, you’ll need to call a plumber to fix that.

  3. Taylor Hansen on September 24, 2020 at 1:50 pm

    It really helped when you said that a leak from the bottom of the tank can be from the inner part. My water heater started leaking again for the 2nd time in 3 months and it’s starting to annoy me. I’ll have to get a professional over to repair it or decide if it’s time for a new water heater.

    • Corro-Protec on September 25, 2020 at 8:01 am

      Hello Taylor, if you are experiencing some issues with your tank because of corrosion you should try one of our powered anode rod!


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