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Why Is My Water Heater Leaking?

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Water heater leaking water onto the floor

Finding a puddle of water in your basement is concerning. While a tiny trickle of water might be easily mopped up, it could be a sign of a larger problem. If the leak is coming from your water heater, you’ll need to diagnose the problem and get it fixed.

Leaks left to drip may become costly. Subfloors and even drywall can be damaged by wayward water. When your water heater is responsible for the leak, there are some telltale places on the unit that water might be coming from.

Water heaters have plenty of components, many with the potential to spring a leak. Some of these component parts are much easier to fix than others—simple tightening of nuts and bolts may solve a slow drip. 

But, if things get much more complicated than using a wrench, it might be time to call in a professional. Of course, you can always save yourself some stress by dialing a technician as soon as you notice a leak. 

Let’s look at some reasons your water heater might be leaking. 

Identifying different areas of a water heater that can leak

Loose Drain Valve

Sometimes, a leaking drain valve is a sign of a failing water heater. But, it could also just mean that the valve itself needs to be replaced.

The drain valve is located at the bottom of the tank and is responsible for draining any sediment from the water heater. It might be leaking due to sediment buildup, a worn rubber gasket, or perhaps cracked plastic parts.

The valve might also just be loose and easily tightened with a wrench. Careful not to overtighten it if trying to perform a repair yourself though!

If you identify the drain valve as the source of the leak, never ignore it. Disregarding a leaking drain valve can cause the tank to empty out completely onto the floor.  A professional can assist before that happens!

Temperature & Pressure Relief Valve

The temperature and pressure relief valve is an important safety feature of the water heater. When the unit gets too hot or the internal pressure too high, the water heater can explode. Thankfully, this valve kicks in and prevents the worst. 

When water leaks from the temperature and pressure relief valve, it can mean one of two things—the valve is doing its job and preventing overheating or overpressurization or the valve is faulty. Either way, this is a problem in need of a solution. 

Frequent triggering of the temperature and pressure relief valve means a professional is needed to determine the cause of high pressure in the water heater. And, if it’s a faulty valve, it will need to be replaced. 

Replacing the temperature and pressure relief valve is a common water heater repair, easily accomplished by experienced technicians.

Technician fixing a leaking water heater

Cold Water Valve

When water is leaking from the top of the unit, the cold water valve might be to blame. While it might not be creating a mess on your floor, water left sitting on top of the water heater could get into the electrical components and cause shorts. 

The cold water valve allows for the heating of cold water entering the unit. A simple twist of the nut might be all that’s needed to quell the leak. But, if you tighten it and the valve is still leaking, it might be faulty and require replacement. 

Tank Troubles

The water heater’s tank is the main portion of the unit that holds water. Sediment that builds up for years in the bottom of a water heater tank can lead to corrosion, allowing water to spill out onto the floor. 

Cracks can also be the culprit. When water heats, it expands. Over time, this expansion can put stress on the tank and cause the unit to fracture. 

Cracked and leaking tanks usually mean the water heater needs to be replaced. You’ll definitely need professional assistance with a full replacement.

Professionals Can Help Repair & Replace

Safety is paramount and before you investigate the source of water heater leaks, you should turn off the power to the unit. Doing so helps prevent any electrical damage to the unit—or harm to yourself.

Once you’ve determined the origin of the leak, decide whether it’s a job for a simple twist of a wrench, or if it’s a more complex problem. If you’re not sure, get in touch with technicians who can help. 

Leaving tasks to the pros can help save money in the long run—they’ll be able to identify and fix problems right away, before any more damage happens from leaking water. 

If you do need to replace your water heater, a tankless option might be the way to go—they don’t store water and they tend to leak much less. The trusted team at Lee’s Air, Plumbing, & Heating can recommend the best course of action for your home!

Written by Thomas Howard

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