Hot Water Heater Leaking

Hot Water Heater Leaking? Here’s What to Do

Imagine waking up to a pool of water near your water heater – a situation no homeowner wants to face. The water heater, a cornerstone in modern homes, is essential for daily comfort, providing hot water for showers, washing dishes, and more. 

Like all the other appliances in your home, though, water heaters have a limited lifespan. According to Bob Vila, a traditional tank water heater can be expected to last 8-12 years, while a tankless water heater might last 20 years or even longer.

Unfortunately, even before the end of their life, water heaters can succumb to leaks. Understanding the severity of a hot water heater leaking hot water heater is crucial, as it can lead to water damage, mold growth, and in severe cases, structural issues. 

How Does a Hot Water Heater Work? 

There are two main types of hot water heaters – traditional tank-style and tankless. 

Tank-Style Water Heaters

Tankless Water Heaters

Tank-style water heaters feature a large metal tank that can hold anywhere from 20 to 80 gallons of hot water. The tank is insulated to maintain the temperature of the stored water, while a thermostat regulates the heat level. When you turn on the hot water tap, hot water leaves the tank and is replaced by cold water that enters from a supply line.

A tank-style water heater can leak due to a range of issues, each related to various components of the heater. Here’s an overview of how this can happen:

  • Tank leaks. Over time, sediment from the water can build up at the bottom of the tank. This sediment can cause the tank to corrode and eventually develop small cracks or holes, resulting in a leak. The leak is typically located at the bottom of the water heater.
  • Leaking drain valve. The drain valve, located near the bottom of the tank, is used to drain the tank for maintenance or to replace the water. If this valve is loose or damaged, it can cause a leak.
  • Pressure relief valve leak. This valve is a safety feature designed to release excess pressure in the tank. If the water pressure within the tank is too high or the valve is faulty, it may start to leak.
  • Leaking supply lines. If the cold-water supply line (brings water into the tank) or the hot water line (takes heated water out of the tank) is loose or damaged, they may leak, often at the top of the tank.

Regular maintenance and timely repair of these components can help prevent leaks in a tank-style water heater.

Tankless Water Heaters

Tankless water heater

Tankless water heaters heat water on demand without storing it. When you turn on the hot water tap, cold water travels through a heating mechanism that warms it up instantly before delivering it to your faucet. 

Compared with tank-style water heaters, there are fewer components in a tankless water heater that can cause leaks. Here are the main reasons for a tankless hot water heater leaking:

  • Overheating. If the thermostat on your tankless water heater is set too high, it could cause overheating and result in a leak.
  • Mineral buildup. As with tank-style water heaters, mineral deposits can accumulate in the heating mechanism of a tankless water heater. This buildup can cause the components to fail, leading to leaks.
  • Loose connections. Loose or damaged connections between the supply lines and the water heater can also result in leaks.

It is vital to have regular maintenance performed on your tankless water heater to ensure everything is functioning properly and avoid the possibility of leaks.

Signs of a Leaking Water Heater 

One of the most apparent signs of a hot water heater leaking is, unsurprisingly, water. But there are other clues you should be aware of to detect leaks early on.

Puddles or Pools Around the Water Heater

The most obvious sign that your hot water heater is leaking is when you find puddles or pools near it. It could be a small leak or a significant rupture, so it’s essential to address it immediately.

Dampness or Water Stains

Sometimes, you may not see water outright, but you might notice dampness or discoloration on the walls near your water heater. This often means that there is a slow leak, and if left unattended, it can lead to bigger problems.

Rust or Corrosion

If you notice rust or corrosion on the water heater tank or pipes, it can indicate a leak. These signs may also mean that your water heater is reaching the end of its lifespan and needs to be replaced soon.

Strange Noises

A leaking water heater can sometimes make strange noises due to the pressure from escaping water. If you hear any unusual sounds coming from your water heater, it’s best to have it checked by a professional.

Identifying the Source of the Leak

hot water heater leaking

Water heater leaks can manifest in various forms and locations, each with distinct characteristics and causes. Recognizing where your water heater is leaking from is the first step in addressing the problem.

Top Leaks – A hot water heater leaking from the top usually indicates loose or faulty connections or valves. Check for moisture around the pipes, valves, or fittings that enter the top of the tank. Be vigilant for corrosion or water stains, as these are telltale signs.

Bottom Leaks – A water heater leaking from the bottom can be more concerning. It often points to a serious internal issue like tank corrosion. If you notice pooling water beneath the tank, it’s likely a sign of a compromised tank lining.

Connection Leaks – These leaks occur at the points where pipes connect to the water heater. Over time, fittings can loosen or washers can wear out, leading to drips or slow leaks.

Before inspecting, turn off the power supply to the unit (electricity or gas) and shut off the water supply to prevent any accidents. When examining your water heater, wear protective clothing and use a flashlight for better visibility.

Visual aids, such as diagrams or photographs, can be incredibly helpful in identifying the leak’s location. By understanding where the leak is coming from, you can better assess the severity and decide on the appropriate course of action.

What to Do If Your Water Heater Is Leaking

Here are the steps you should take to fix a leaking water heater:

  1. Locate the source of the leak. Water heater repair starts by determining where the leak is coming from. If it’s a small leak, you may be able to fix it yourself temporarily. However, if it’s a significant rupture, turn off the power or gas supply to your water heater.
  2. Turn off the water. Once you’ve located the source of the leak, turn off the water supply to your water heater.
  3. Drain the tank. If the leak is coming from the water heater tank, you’ll need to drain it. You can do this by attaching a garden hose to the drain valve at the bottom of the tank and directing it outside or into a nearby drain.
  4. Call a professional. While you may be able to temporarily fix a small leak yourself, it’s always best to call a professional plumber to inspect and repair your water heater. They can also advise on whether it’s time for a replacement.

Temporary Fixes for a Leaking Hot Water Heater

Temporary Fixes for a Leaking Hot Water Heater

While it’s highly recommended to call in a professional for a leaking hot water heater, there are a few temporary fixes you can apply if the leak is minor.

  • Pipe Repair Clamp. If the hot water heater leak is coming from a pipe, a pipe repair clamp can be a temporary solution. This clamp is simply tightened over the leaking area, halting the flow of water. However, this is a temporary fix and the pipe will still need to be replaced or repaired.
  • Epoxy Paste. If the leak is small and located on the tank surface, an epoxy paste can be used to seal the leak. Make sure the heater is turned off and the surface is clean and dry before applying the paste. Allow it to dry completely before turning the heater back on.
  • Water Weld. Water weld is a specialty epoxy that can be used even if the area is not completely dry. It works well for both pipes and the tank.
  • Teflon Tape. If the leak originates from a threaded connection, Teflon tape can be used to help seal the leak. Wrap the tape around the threads before reapplying the connection.

However, these are only temporary solutions and won’t address the root cause of the problem. Always consult with a professional plumbing company to ensure a comprehensive solution to prevent further damage.

Taking Immediate Action

When you encounter a leaking water heater, it’s essential to respond promptly to avoid any further damage. Always prioritize your safety by turning off both the power supply and the water supply to the heater. This will eliminate the risk of electrical shock and prevent water damage.

If the leak appears to be severe, it’s highly recommended that you contact a professional plumber immediately. A professional plumber can assess the situation and provide the best course of action to avoid any significant damage.

However, if the leak is minor, you can attempt to fix it temporarily. For example, if the issue is a loose connection, tighten the fittings. Additionally, if a washer or gasket appears worn, replacing it can stop the leak.

For cases where you are unsure about the leak’s source or if it’s a significant issue such as a cracked tank, it’s best to seek professional water heater repair services. A professional can assess the situation and determine the best course of action, and assess whether it’s more cost-effective to fix the leaking water heater or replace it entirely.

Preventing Future Leaks

Preventative maintenance is key to prolonging the life of your water heater and avoiding future leaks. Regular inspections, tank flushing, and keeping the thermostat set to a safe temperature can significantly reduce the risk of leaks.

Additionally, choosing the right size water heater and ensuring proper installation are crucial steps. Annual check-ups by a professional are recommended to ensure everything is functioning correctly and to catch potential issues early.

Stronghold Plumbing In & Near Lakeland

When it’s time to repair or replace a leaky hot water heater, don’t just search for “plumbers near me.” Contact the best plumbers in and near Lakeland – Stronghold Plumbing & Septic. We not only offer water heater services but also a full range of other plumbing services, from installation to repairs and inspections – and we offer free plumbing estimates!

Contact us today for all your Florida plumbing needs. 

FAQ-s – Leaking Hot Water Heater

Is a leaking water heater dangerous?

If left unattended, water leaks can lead to substantial damage to your home, including structural damage from water seeping into walls or floors, and potential growth of mold, which can be harmful to health. Furthermore, if the water comes into contact with electrical components, it could lead to electrical shorts and pose a risk of shock. In rare cases, if the temperature and pressure relief valve is malfunctioning and the water heater overheats, it could result in the tank bursting. Therefore, any signs of a leak should be addressed immediately to prevent potential hazards.

Why is my water heater leaking?

Water heater leaks can be caused by various factors, including normal wear and tear, high water pressure, corrosion, or internal problems with the tank. It’s essential to determine the source of the leak to determine the best course of action.

What to do if water heater is leaking

If your water heater is leaking, it’s crucial to act quickly. First, locate the source of the leak and turn off the power and water supply to the unit. Depending on the severity of the leak, you may be able to temporarily fix it or call a professional plumber for repairs.

Can you still use water if water heater is leaking? 

If the leak is minor and doesn’t affect the functionality of your water heater, you may still be able to use hot water until repairs can be made. However, if there is significant damage or a severe leak, it’s best to avoid using the water heater until a professional has assessed and repaired it.

How to stop water heater from leaking 

To stop a water heater from leaking, you’ll need to determine the source of the leak. If it’s a minor issue, such as loose connections or worn washers, tightening and replacing them may temporarily fix the problem. However, for more significant issues like a cracked tank, it’s best to seek professional services.


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