Why is My Water Heater Leaking?
If you find your water heater leaking, you need to take action immediately. A leaking water heater may seem like a minor inconvenience, but in reality, it can quickly turn into a major problem. The average water heater has a 50-gallon tank and whenever water leaves the tank (drawn or leaking) cold water will quickly refill it to capacity.
As the tank is constantly refilling from the water heater leak, the area surrounding your tank will flood. Even a small amount of water leaking from your water heater can cause damage to your floors, sub-floors and walls. A significant flood could lead to hefty repair bills and damage to personal property. Water heater leaks can also be a health concern and lead to mold and mildew.
A water heater leak won't go away on it's own. Over time, it'll get worse.
Not all water heater leaks are serious. Some can be repaired by simply tightening a connection. Others may need a little more attention, but you can probably do the repairs yourself, especially if you enjoy DIY projects.
Unfortunately, there's also times when you'll find your water tank leaking and you'll either need to call a plumber to make the repairs, or purchase a new water heater.
Either way, this article will help you determine why your water heater is leaking and what you should do to resolve the problem.
Let's get started!
If your water heater leak is not obvious, then you may want to do a little troubleshooting before turning off the water supply. Just because you have water under your water heater doesn't mean that your water heater is leaking.
Furnace drain lines, water softener discharge lines, condensation, and other plumbing could be the source. These things can easily make it look as though your water tank is leaking, when in fact, the problem isn't your water heater at all.
If you can't identify where the water is coming from, you can dry the area and place some paper towels or newspapers down. Check back over the next couple of days. If the water returns, and you still can't identify the source, there's a good chance your water heater is leaking.
Turn Off the Water Supply
The first thing you need to do is turn off the water supply to your water heater.
On top of your water heater there should be two pipes. One will be warm to the touch and the other cold. Some manufacturers even identify them with red and blue collars or paint.
The pipe that's cold is the water supply line. It allows cold water to enter your water heater when hot water is drawn. Follow the line and look for a shutoff valve. Most water heaters have a shutoff valve on the water supply line.
Although the majority of water heaters have a shutoff valve on their water supply line, some do not.
In this case, you may need to turn the water off using your home's main shut-off valve. This will shut down all the incoming water to your house, including the water supply to your water heater.
Turn Off the Power
With your water turned off, it's now time to turn off the power to your water heater. The process is different for gas and electric heaters:
Gas Water Heaters
Follow these steps to turn off the power to a gas fueled water heater:
Electric Water Heaters
Follow these steps to turn off the power to an electric fueled water heater:
Now with your water and power turned off, it's time to roll up your sleeves and do some troubleshooting!
Right now our goal is to identify the source of the water heater leak. Once you determine why your water heater is leaking, we'll show you how to fix the problem.
As a general rule, when a water heater leaks from the top the problem can be repaired. In fact, you may be able to do the fix yourself.
Unfortunately, when your water heater is leaking from the bottom, there's a greater chance that the problem is serious . . . but not always.
Here are some of the most common reasons a water heater leaks:
Cold Water Inlet / Hot Water Outlet
If your water heater has a pool of water on top, there's a good chance that the source of the leak is either the incoming water supply valve, cold water inlet, or the hot water outlet.
Whenever there are pipe connections, there's a higher chance of a leak. Follow the cold and hot water pipes. Do you see any water? Are the fittings tight? Is there any leakage around the shutoff valve on the cold water supply line?
The fix to any of these problems could be pretty easy and you may be able to do it yourself. Here's what to do.
T&P Relief Valve
The temperature & pressure relief valve (T&P relief valve) is a safety device required on all water heaters.
When pressure builds within the tank to an unsafe level, the T&P valve relieves the tank pressure by opening the valve and allowing some of the water out of the tank.
This will prevent the tank from bursting or exploding!
You can find the T&P relief valve on the top of your water heater or on the side. Look for a copper or PVC pipe that runs down the side of the tank towards the floor. This is the T&P drain pipe and it connects to the relief valve.
Since the T&P relief valve is a safety device, and if this is the source of your leak, it's important that the valve is either replaced, or a plumber is called as soon as possible.
A T&P relief valve issue does not necessarily mean you'll need to purchase a new water heater, but the leak does need to be addressed.
Once you determine that the problem is coming from the T&P valve we'll do some additional troubleshooting to try to isolate the problem. If the solution is to replace the valve, we'll show you how.
The drain valve is located near the bottom of the tank and is used to drain the water when repairs and/or maintenance tasks are required.
Unfortunately, many manufacturers install low quality drain valves in their water heaters, so it's not uncommon for this to be the source of your leak.
Water heaters have a steel internal tank which is wrapped in insulation and then enclosed within an outer visible skin.
If the internal steel water tank is leaking, you won't be able to see it by looking at the outer skin. In most cases, you'll notice water under the water heater since the most likely way for it to escape is from the bottom.
When you were inspecting your drain valve and T&P relief valve, you may have noticed moisture where the valves entered the tank. If this was the case, there's a good chance that your internal water tank is leaking.
Even with the best care, water heater tanks break down. Age and deterioration takes a toll and eventually the tank will begin leaking.
If your internal tank is leaking, your options are pretty limited.
If the problem appears to be minor, and you have experience doing your own home plumbing repairs, you may choose to fix your leaking water heater yourself.
But many homeowners are more comfortable hiring a plumber to make the repairs. The decision really depends on your comfort level and the complexity of the repairs.
Cold Water Inlet / Hot Water Outlet Repairs
If you have a leak coming from the area where the cold water inlet or hot water outlet connects to the water heater, you may be able to fix it by tightening the connections with a pipe wrench.
If tightening the connectors doesn't stop the leak, then you should replace the flex lines that supply the cold water (or hot water). The video below will show you how.
Watch the Video
T&P Relief Valve Repairs
There are three main reasons you may have water leaking from your T&P relief valve:
- Faulty valve
- Clogged valve
- Excessive PSI and/or water temperature within the tank
Since the T&P relief valve is designed to prevent your water heater from overheating and developing excessive pressure within the tank, it's a good idea to do a little extra troubleshooting before assuming the valve is faulty and simply replacing it with a new one.
This article will show you how to determine if the problem is a faulty T&P relief valve or if the valve is actually doing its job. If it's the latter, then your water heater requires immediate attention.
Leave the heater's water and power off and call a professional right away.
The following video explains the role of the T&P relief valve and what causes it to leak.
Watch the Video
It's also not uncommon to notice water leaking from the threads of your T&P relief valve where it attaches to the tank. If this is the case, you'll need to remove the T&P valve and check the tank for signs of rust or corrosion.
If you see signs of rust or corrosion it's an indication that the problem is with the internal tank. Unfortunately, you'll need to purchase a new water heater.
However, if the tank appears to be in good condition, you can wrap the threads of the T&P valve with Teflon tape and screw it back into the tank. It may simply not have had a good seal.
Keep an eye on your water heater for the next few days to see if this resolved the leaking problem.
How to Replace the T&P Relief Valve
If you determine that the valve is faulty and needs to be replaced. You can find step-by-step directions here, or follow along with this instructional video.
Watch the Video
Drain Valve Repairs
If your water heater is leaking from the drain valve, it is generally one of two things:
- There is debris inside the valve preventing it from fully closing
- The drain valve is faulty
First we need to rule out that a clog is preventing the drain valve from closing. Here's what to do:
Unlike the T&P relief valve, the drain valve is not a safety device. If you're unsure about replacing the valve yourself, or don't have time to get to it right away, you can simply buy a brass garden hose end cap and screw it onto the drain valve threads
This should stop the leak until you're able to replace the drain valve.
How to Replace a Drain Valve
Changing a drain valve is relatively easy, and something you can do yourself once you buy a new valve. Always be sure to purchase one that's compatible with your water heater.
In order to replace a drain valve, you'll need to drain the tank. Be careful not to come in contact with the hot water.
Water heaters are usually factory-set to heat water to 125°F, which is hot enough to inflict first degree burns to skin on contact. And, if the water temperature was set to maximum, the water could be anywhere from 160° to 190°F which could result in serious injuries!
The video below will show you how to replace a drain valve.
Watch the Video
Internal Tank Leaks
If your water heater is leaking from the bottom of the tank, it suggests that there's a serious internal problem.
NEVER attempt to disassemble your water heater and perform internal repairs.
If your internal tank is leaking, you really only have one viable option. You'll need to replace the water heater. Internal tank leaks can not be repaired and the leak will only get worse.
However, if the water heater leak isn't too bad, and its installed in a basement or garage, you could buy yourself some time and just keep an eye on it.
Although we don't recommend this approach, a minor leak likely won't do too much damage on a cement floor, especially in a garage. It could allow you to budget for a new water heater, rather than going in debt or buying an inexpensive lower quality unit.
If you do choose to go this route, we highly recommend purchasing a water alarm and positioning the sensor at a distance that will alert you to a serious leak.
As we discussed above, when you find water under a water heater the problem can be serious and action should be taken as quickly as possible.
Depending on the type of leak, you'll either need to repair or replace your water heater. Although, many of the repair fixes can be performed by the homeowner, frequently people prefer to call a professional plumber.
Your comfort level in tackling DIY projects will likely be the determining factor.
Water heaters generally last 8 to 12 years. So if your leaking water heater is nearing old age, you may choose to replace it with a new energy efficient model rather than pay for repairs.
New water heaters are far more energy efficient, which means they will save you money each month in operating costs. They'll also be under warranty, so any issues for the next couple of years will be covered.
We recommend considering the cost of repairs and the age of your water heater when you make your decision on whether to repair or replace your water heater.
But if you're still on the fence, this article will provide you with 5 warning signs of when you should consider buying a new water heater.
Your water heater is one of the main appliances in your household. When it isn't operating correctly, it'll make its problems known. Either by not delivering hot water, creating unusual noises, or leaking.
Chances are, you have some questions. Here are some of the most common questions homeowners have in regards to water heater issues:
Who Do You Call if Your Water Heater is Leaking?
If you've determined that your water heater leak is beyond your skill set. You need to call a professional plumber at 1(888) 594-4431. They'll be trained and prepared to handle any issue they encounter, and can offer advise on whether you should repair or replace your water heater.
How Do I Get Rid of My Old Water Heater?
If you hire a plumber to replace your water heater, in most cases they'll get rid of the old one for you. However, if you're replacing the water heater yourself, you'll need to find a way to get rid of it on your own. This article will give you several options.
Should I Upgrade to a Tankless System?
Maybe. Tankless water heaters are wonderful and have many advantages. But they aren't for every homeowner. We recommend reading our Tankless Buyers Guide to see if making the switch is a good move for you. There's a lot to consider, so take your time to be sure it's the right thing to do.
Is it Dangerous to Have a Leaking Water Heater?
Yes, if your water heater is leaking because the T&P relief valve is releasing pressure from within the tank, then the situation could be extremely dangerous. Your water heater is malfunctioning and causing either the internal tank pressure to be above 150 psi or the water temperature to be above 210°F. Turn off the power and call a professional immediately.
However, in most cases, water damage is the biggest concern. Repairing damaged floors can be expensive and it'll be critical that the clean-up is properly done or you may develop mold and mildew. Mold and mildew can be a health hazard and can cause serious respiratory problems.