Water heater drain valve leaking
Home Heater Water heater drain valve leaking: Symptoms, reasons and solution

Water heater drain valve leaking: Symptoms, reasons and solution

by Eric

Water heater drain valve leaking:

Once you’ve confirmed your water heater valve is leaking, it’s time to fix it before it gets worse. Here are some steps you should follow, to avoid any inconvenience:

  • If your heater valve is damaged, do not let the water run out of it, you should turn off the water heater, so that you can easily repair the valve and avoid wasting water. You can do this by turning off the heater supply. 
  • If the leak doesn’t seem severe, you can fix it yourself, as if the leak is at the top, it can be fixed with a simple wrench, or if there’s another problem, including the appearance of a leakage at the bottom, or if the leak is caused by the temperature and high pressure inside the heater, it can be dangerous to do anything by yourself, so it’s best to call a professional plumber to avoid a major problem. 
  • Water heaters often leak when the magnesium anode rod inside it, becomes corroded (which is acting like a magnet that attracts all the water particles, can cause corrosion in the heater). You can simply change this rod annually to avoid the leakage of house water heater.

After solving the problem, switch on the supply and check if there is any leakage.  

Symptoms which confirm leaking of water heater:

If you see water pooling near your water heater, it doesn’t always mean that your heater is leaking, as it could be caused by water vapor on the heater as its internal temperature is high. If this condition occurs even when your heater is not in use or turned off, it may be due to a leak. Water dripping from different parts of the water heater can mean different things, so it’s best to consult a plumber after noticing anything strange. If the magnesium rod inside the heater starts to corrode, it can also be a sign of an early leak, which can give you an alarm to take precautions.

40 Gallon Water Heater for your family

Why the water heater valve is leaking?

Leaks can occur for a number of reasons, such as highly sensitive temperature and pressure relief valves or any damage to high pressure and temperatures up to 250º F, can start to release water from the tank or if the pressure is too high. You should clean your water heater once every 2 or 3 months, to remove minerals and other particles, which can cause corrosion and lead to leaks.

When Should You Insulate Your Water Heater and Other Pipes?

Some hot water tank drain valves are made of plastic, and if you leave the plastic unchanged for many years, it can crack and break down due to constant and high temperatures, may cause water heater drain valve leaking. When the valve is used to empty the drain tank, the plastic may crack, causing a leak. Plastic drain valves also use rubber gaskets that deteriorate over time and should be replaced in a timely manner to avoid any problems.

Ways to fix water heater drain valve leaking:

Dealing with a leaking water heater drain valve can be a common issue, but it’s essential to address it promptly to prevent further damage. Here are some steps to fix a leaking water heater drain valve:

  • Turn Off the Power:

Safety first! Before you start working on your water heater, ensure that the power source, whether it’s electricity or gas, is turned off. For electric water heaters, you can switch off the circuit breaker, while for gas heaters, turn the gas valve to the “off” position.

  • Prepare Your Tools:

Gather the necessary tools, including a garden hose, a wrench, a bucket, Teflon tape, and a replacement drain valve if needed.

  • Connect a Hose:

Place a bucket or a container beneath the drain valve to catch any water that may come out. Then, connect a garden hose to the drain valve. This will help direct the water away from the area and prevent a mess.

  • Open the Drain Valve:

Slowly open the drain valve to release the water from the tank. Be careful, as the water can be hot. Allow the tank to empty completely.

  • Inspect the Drain Valve:

Check the condition of the drain valve. If it’s damaged or has a worn washer, it may need to be replaced. If it’s in good condition, you might try tightening it with a wrench. Be gentle, as over-tightening can cause further damage.

  • Use Teflon Tape:

If the leak persists after tightening or if you’ve replaced the drain valve, apply Teflon tape to the threads of the new valve or the existing one. This helps create a tight seal when reassembling.

  • Reassemble and Test:

Carefully reassemble the drain valve, ensuring it’s securely tightened. Turn the power back on and monitor for any leaks. If there are no leaks, your problem is resolved.

  • Monitor Regularly:

Keep an eye on the tankless water heater for a while to ensure there are no new leaks. If the issue persists, you might want to consult a professional plumber.


The prevention of water heater drain valve leaks is a critical aspect of maintaining the longevity and optimal performance of your water heating system. By implementing straightforward preventive measures, you can significantly reduce the risk of this common issue and the associated inconvenience and potential damage to your property.

Regular maintenance is the cornerstone of leak prevention; scheduling annual inspections with a qualified plumber ensures the early detection of any wear and tear, including the condition of the drain valve, saving you from costly repairs down the road.

Ensuring the correct functioning of the temperature and pressure relief (TPR) valve is crucial, as this valve is designed to release excess pressure and temperature, preventing overloads on the tank, and should be regularly tested and replaced as needed. Another essential preventive step is the replacement of the sacrificial anode rod, which protects the tank from corrosion, thereby extending the water heater’s life and reducing the risk of leaks due to rust and corrosion.

Related Posts

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More