Hot Water System Leaking? Here’s What Might Be Causing It

A leaking hot water system is more than just a nuisance—it can lead to higher water bills, property damage, and even complete system failure if not addressed quickly. Whether you’ve noticed water dripping from your water heater, a leak from the pressure relief valve, or pooling water around your hot water tank, it’s crucial to identify the problem early.

At Pat’s Plumbing and Gas, we’ve helped countless homeowners across NSW troubleshoot and repair their leaking hot water systems. In this guide, we’ll cover common causes of leaks, warning signs to watch for, and what you can do to fix the problem before it worsens.

Common Causes of a Leaking Hot Water System

1. Pressure Relief Valve Dripping

The temperature and pressure relief valve (TPR valve) is designed to release excess pressure from your hot water system. If you notice water leaking from the pressure relief valve, it could indicate:

✔ Excessive pressure inside the tank
✔ A faulty valve that needs replacement
✔ Sediment buildup causing blockages

Solution:

• Try opening and closing the valve to flush out any debris.
• If it continues to drip excessively, you may need to replace the hot water system relief valve.

2. Hot Water System Leaking from the Overflow Pipe

If water is constantly leaking from the overflow pipe, this could mean:

✔ The system is overheating, causing excess pressure buildup.
✔ The expansion control valve is faulty or needs adjustment.
✔ There’s a blockage in the relief drain.

Solution:

• Check if the thermostat is set too high (it should be around 60°C for most homes).
• Inspect the overflow pipe for debris or obstructions.
• If the problem persists, call Pat’s Plumbing and Gas to assess the system.

3. Hot Water Tank Leaking from the Bottom

A hot water system leaking from the bottom is often a serious issue that requires immediate attention. Common causes include:

✔ Corrosion inside the tank (especially in older systems)
✔ A loose or damaged drain valve
✔ Cracks or fractures in the tank itself

Solution:

• If the drain valve is leaking, try tightening it gently.
• If the tank itself is corroded or cracked, replacement is the only solution.
• Gas hot water systems leaking from the bottom could indicate a faulty burner or gas connection, which requires professional repair.

4. Water Dripping from the Top of the Hot Water System

Leaks from the top of your hot water tank can be caused by:

✔ Loose pipe connections
✔ A faulty inlet or outlet valve
✔ High pressure leading to joint leaks

Solution:

• Tighten any loose fittings using a wrench.
• Inspect the hot water outlet and inlet connections for corrosion.
• If the issue persists, you may need to replace the leaking component or have Pat’s Plumbing and Gas inspect the system.

5. Rust or Corrosion in the Hot Water System

Over time, corrosion can develop inside your hot water storage tank, leading to leaks. Signs of corrosion include:

✔ Rusty water from taps
✔ Brown or discoloured water pooling around the unit
✔ Visible rust on the exterior of the tank

Solution:

• If your hot water tank is leaking due to rust, replacement is the only option.
• Regular maintenance and flushing the tank annually can prevent sediment buildup.

Is a Leaking Hot Water System Dangerous?

Yes! A leaking water heater can pose serious risks, including:

🚨 Water damage to your floors, walls, and surrounding structures.
🚨 Increased energy bills from wasted hot water.
🚨 Potential gas leaks if you have a gas hot water system.
🚨 Tank failure that could cause flooding if left unchecked.

If you notice water leaking from your water heater, don’t ignore it—get it checked by Pat’s Plumbing and Gas.

When to Call a Professional Plumber

While some minor leaks can be fixed with simple adjustments, you should call Pat’s Plumbing and Gas if:

✔ Your hot water system is leaking continuously, despite troubleshooting.
✔ The water heater tank is leaking due to corrosion.
✔ You notice a gas smell near your gas hot water system.
✔ The pressure relief valve keeps dripping excessively.
✔ You have no hot water or fluctuating temperatures.

At Pat’s Plumbing and Gas, we offer hot water system repairs, replacements, and emergency plumbing services across NSW, ensuring your system runs safely and efficiently.

FAQs – Common Hot Water System Leak Questions

1. Why is my hot water system leaking from the pressure relief valve?

It’s designed to release excess pressure inside the tank. If it’s constantly leaking, it could be due to high pressure, sediment buildup, or a faulty valve.

2. Can I fix a leaking hot water system myself?

You can try tightening loose fittings or flushing the system, but if the leak continues, call Pat’s Plumbing and Gas in Jordan Springs, Penrith, Kingswood and surrounding areas in NSW for professional repairs.

3. How do I stop my water heater from leaking?

Check for loose connections, a faulty relief valve, or signs of rust. If the tank itself is leaking, replacement is the only solution.

4. Is a leaking hot water system an emergency?

Yes, especially if there’s a risk of flooding, gas leaks, or complete system failure. If you suspect an emergency, contact Pat’s Plumbing and Gas immediately.

5. How much does it cost to fix a leaking hot water system in Sydney?

Costs vary depending on the issue. Minor repairs (like replacing a valve) can be affordable, but a full system replacement can be more expensive. Get a quote from Pat’s Plumbing and Gas for an accurate estimate.

Need Help with a Leaking Hot Water System? Contact Pat’s Plumbing and Gas Today!

A leaking hot water system is a sign that something is wrong. Whether it’s a minor drip or a major leak, the sooner you address it, the better.

📍 Servicing NSW, including Jordan Springs, Penrith, Kingswood and surrounding areas
📞 Call Pat’s Plumbing and Gas for expert hot water system repairs today!

Fix your leaking hot water system before it becomes a bigger problem!