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January 17, 2025Maybe you’ve noticed water pooling around your hot water system, or worse, you’ve been hit with unexpectedly low water pressure. Sound familiar? If your hot water system is acting up, it could be leaking, and that’s something no one wants to deal with.
Whether you have a low hot water pressure issue or leaking hot water system – having a good understanding of what may be causing the issue is essential as it can help to prevent bigger headaches down the track.
In this guide, our hot water plumbing service experts are going to take you step by step through some of the most typical leak scenarios, and how to repair them. Ready to dive in? Let’s go!
Why is Your Hot Water Leaking?
This issue might happen across all types of hot water systems. That’s why you need to understand reasons why you have a leaking hot water system. So, you can get to the root of the problem quickly.
But don’t worry, we’ll break down the most common causes and what you can do about them!
Let’s start by identifying a few of the usual suspects when it comes to your hot water system leaking from the bottom or even the top.
1. Leaking Hot Water Tank
- Hot water tank is leaking from the top. The possible cause could be a problem with a damaged pressure relief valve or inlet pipe. These are integral parts that regulate the hot water flow. It’s recommended to identify these issues early before they become too critical. Check for rust or moisture that are typically found near the valve.
- Hot water system leaking from the bottom. This might be due to tank corrosion and a sediment buildup inside. Sediment builds up in the tank and settles down which causes the tank to overheat, and eventually breaks down. This typically requires a system flush or in the worst case, replacing the tank entirely.
2. Faulty Temperature and Pressure Relief Valve (TPR Valve)
A TPR valve is designed to release water if the temperature or pressure inside the tank gets too high. So, ignoring this issue can lead to hot water running out quickly, as the leaking valve reduces the efficiency of the system.
When it’s malfunctioning, it might cause water to leak even when the temperature and pressure are at normal levels.
If you notice water dripping from the valve, it’s important to inspect it closely. A simple fix might involve just tightening the valve or cleaning any debris. However, you need to replace the valve if it’s old or worn out.
3. Corroded Pipes or Connections
Leaking pipes or loose connections around the hot water system can also cause significant water loss and low hot water pressure.
Over time, pipes and connections can rust or become corroded, especially if they’re exposed to moisture regularly. This is particularly common in older systems where the materials may have weakened.
If you see rust or corrosion near the pipes, that’s a clear sign the connection could be compromised. In some cases, simply tightening the fittings can stop the leak. However, if the corrosion is widespread, you may need to replace the affected pipes to prevent further damage.
What To Do If Your Hot Water System is Leaking?
You’ve learned some of the possible reasons behind your leaking hot water system, now we’ll cover how to identify the source and address it before things get worse.
1. Identify the Leak
The first step in solving any problem is knowing exactly where it’s coming from. Is your gas hot water system leaking from the bottom, or the top? Once you’ve located the source, you’ll have a better idea of what needs to be done.
Start by checking around the base of the tank for any water buildup—this is often the most visible sign of a leak. If water is pooling at the bottom, the issue could be corrosion or a cracked tank. But if the leak is coming from the top, inspect the connections and valves for any loose fittings or visible damage.
If you have a gas water heater, and you notice the pilot light has gone out, it might be related to the leak. Knowing how to relight gas water heaters can save you some stress, especially if you’re facing a cold shower! Just make sure to turn off the gas supply before relighting.
2. Turn Off the Power or Gas Supply
If you’ve identified that your gas hot water system is leaking from the bottom or there’s a problem with your electric tank, it’s essential to turn off the power or gas supply before making any repairs.
For electric water heaters, you can do this by switching off the circuit breaker. If you have a gas system, turn the gas valve to the “off” position to prevent any dangerous buildup. Turning off the system will stop the water from heating further, which could help minimise damage to the tank.
3. Drain the Tank
If you want to empty the tank, make sure your garden hose has a drain valve at the base of the unit. Point the other end of the hose to a safe drainage place, like your driveway or a floor drain, and open the valve in order for water to release.
Emptying the tank will give you a good view to see if there is any excessive rust or sediment. Moreover, it also allows you to determine if there is anything clogging your filter so you can act accordingly.
4. Inspect Your Valves and Connections
After the tank has been drained and ensured safe for inspection, inspect the valve itself and all related connections. Now, it’s time to check the TPR valve we mentioned earlier.
If there is a leak, you can try tightening or replacing the valve to fix the issue. In addition to inspecting it, you also need to check the inlet and outlet connections for any corrosion or damage that may have developed over time.
In some cases, a minor adjustment can end the leak. However, extreme rust or other damage can be significant signs that it may be time to replace these components.
5. Seek Out Professionals
When in doubt, play it safe! If you have done everything above and still do not find the origin of your problem, or if the problem is more complicated to be resolved by yourself — then simply call in a professional. They can analyse the issue and address it before it becomes a major repair or replacement work.
Remember, you do not want to wait too long – the longer a leak stays ignored, the more damaging it can be to your plumbing system.
How to Prevent Hot Water System Leaks
As the saying goes, prevention is far easier and much easier (and even cheaper!) than getting to the point where you deal with a leaking hot water system.
Hence, proactive maintenance is strongly advised so you won’t have to deal with unnecessary headaches in the future.
Continue to scroll below and learn some tips and tricks to help you avoid the leaks:
1. Schedule Regular Inspections
A quick monthly visual inspection can go a long way in preventing costly damage.
Check your tank, pipes, and connections for any signs of rust, moisture, or wear. Pay special attention to the pressure relief valve and ensure it’s functioning properly.
2. Drain the Tank Annually
Over time, sediment builds up at the bottom of your tank, which can lead to overheating and tank damage.
Draining the tank at least once a year helps remove this buildup and prevent internal corrosion and improve the system’s efficiency.
3. Inspect and Tighten Connections
Loose or corroded connections are a common cause of leaks. Regularly inspect all inlet and outlet connections for signs of wear, rust, or dampness.
Tighten any loose fittings and replace corroded parts promptly to avoid further issues.
4. Check the Anode Rod
The anode rod is a very important component in preventing rust inside your tank, simply because it attracts corrosive elements to itself.
It can wear out over time and thus lose its effectiveness. Inspect the rod every couple of years, replacing it if it’s corroded or significantly reduced in size.
5. Monitor Water Pressure
Excessive water pressure is going to put stress on your system and increase the risks of leaks.
Check your water pressure with a pressure gauge and ensure it stays within the recommended range, not exceeding 500 kPa preferably. If the pressure is too high, consider installing a pressure-reducing valve.
Does a Leaking Hot Water System Mean You Need to Replace It?
A leaking hot water system doesn’t always mean it’s time for a replacement, but it’s a possibility you shouldn’t ignore.
For leaks that are caused by loose connections or broken valves, your hot water system can most likely be repaired.
Meanwhile, a replacement is required if you’re dealing with a corroded or cracked tank.
For older systems, especially those nearing or beyond their expected lifetime, are more likely to develop leaks that signal the end of their usability.
The trick is in knowing how bad the leak is and where it is coming from. For instance, if your tank is leaking at the bottom because of damage from the sediment at the bottom, repairs may be more than a temporary fix.
In case you cannot decide yet if your system should be salvaged or replaced completely, it is always best to consult professionals. They will be able to inspect your system, locate the leak source, and recommend the best course of action.
FAQ about Leaking Hot Water System
To give you a further understanding and address this issue, here are some common questions homeowners often have about leaking hot water systems:
1. Is a leaking hot water heater an emergency?
Yes, a leaking hot water heater can be considered an emergency, depending on the severity of the leak.
Small drips might not seem urgent, but they can lead to water damage and escalate into larger issues.
If the leak is significant or near electrical components, it’s essential to shut off the water supply and call a professional plumber immediately.
2. Can I still use the water heater if it is leaking?
Using a leaking water heater is not recommended, as it can worsen the damage and compromise the system’s efficiency.
Leaks can cause the heater to work harder, leading to higher energy costs and potential failure. It’s best to turn off the unit and have it inspected by a professional.
3. How long will a water heater last after it starts leaking?
Once a water heater starts leaking, its lifespan is typically limited. While minor leaks might be repairable, significant leaks often indicate that the unit is nearing the end of its life.
In most cases, a replacement is the most practical solution to prevent further issues.
4. Is a leaking water heater a fire hazard?
A leaking water heater can pose a fire hazard, especially if the leak reaches electrical components.
Water and electricity are a dangerous combination, so it’s crucial to address the issue immediately to avoid potential safety risks. Turning off the power supply to the unit is a necessary first step.
5. What happens if a water heater keeps leaking?
If a water heater continues to leak, it can cause water damage to surrounding areas, promote mold growth, and lead to structural issues in your home.
Additionally, the system’s internal components may corrode, making it unsafe and inefficient. Prompt action can save you from costly repairs and further damage.
6. Can a leaking water heater burst?
Yes, a leaking water heater can eventually burst if the pressure inside the tank builds up due to a malfunctioning pressure relief valve or excessive corrosion.
A burst water heater can cause extensive flooding and property damage. Addressing leaks early can help prevent this catastrophic outcome.
Conclusion
We hope by now you are already equipped with enough information to address common issues and take steps related to a leaking hot water system. However do keep in mind, not all repairs are a DIY fix.
Still not totally sure where your leak is coming from?
It’s time to get in touch with the experts at Neighbourhood Plumbing Melbourne. Our team offers top-notch hot water plumbing service that can take care of anything from minor leaks to full scale repairs.
Don’t stress out because of a leaking hot water system, let us fix it for you. If you have any more queries about our extensive range of services, why not give us a call today?
Dial 0488 885 122 and find out how we could help with your plumbing Melbourne problems!
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
