Why a hot water unit leaking should never be ignored
You step outside and notice a puddle forming around the base of your hot water system. Naturally, your first thought is, what now?
If you’ve spotted a drip, a trickle, or even a steady stream, don’t panic. However, don’t ignore it either.
At RD Plumbing Solutions, we’ve seen every type of hot water unit leaking imaginable. As a local, independent, family-owned business, we understand the unique plumbing challenges South Australians face, from hard water to older pipework.
In this guide, we’ll explain why is your hot water unit leaking, what it means, and what steps to take next.
The Most Common Cause: Pressure Relief Valve Leaks
In many cases, the issue isn’t the tank itself.
What Is the Pressure Relief (TPR) Valve?
The Temperature Pressure Relief valve is a safety device. It releases water when pressure or temperature inside the tank becomes too high.
Because Adelaide’s mains water pressure can fluctuate, this valve is often the first thing to leak.
Is a Dripping TPR Valve Normal?
- ✔ Normal: A small drip (around a cup per day)
- ❌ Not normal: Constant flowing or gushing water
Mineral buildup from South Australia’s hard water can block the valve, causing it to fail.
RD Tip: Gently lift the test lever for a few seconds and let it snap back. If leaking continues, the valve needs replacing.
When the Leak Is Coming From the Bottom of the Tank
Unfortunately, this is the scenario homeowners fear most.
Corroded Hot Water Tanks Explained
Most hot water units have a steel tank protected by a glass lining. Over time, minerals in the water attack the metal.
If water is leaking from the bottom of the unit, the internal tank has usually rusted through.
The Sacrificial Anode: Small Part, Big Job
Inside every tank is a sacrificial anode. Its job is to corrode instead of the tank.
- The problem? Most homeowners forget it exists
- The solution? Check and replace it every 3–5 years
Replacing the anode can double the life of your hot water unit.
Sometimes It’s Just Loose Pipes or Fittings
Not every leak is catastrophic.
Over years of hot summers and cold winters, pipework expands and contracts. As a result, fittings can loosen.
What to Look For
- Damp connections at the top of the unit
- Green or white crusty buildup on fittings
- Slow leaks around unions or valves
In many cases, a reseal or tighten by a licensed plumber solves the issue quickly.
High Mains Pressure: A Common Adelaide Problem
Did you know Adelaide has some of the highest water pressure zones in Australia?
If your home doesn’t have a Pressure Limiting Valve (PLV) set to 500kPa, excess pressure can damage your hot water unit and appliances.
Leaks that worsen overnight are a strong sign of pressure issues.
Why South Australian Water Plays a Role
South Australian water is classified as hard water. It contains high levels of calcium and magnesium.
When heated, these minerals form limescale, which settles at the bottom of the tank. Over time, this causes overheating, metal stress, and eventual leaks.
SA Plumbing Regulations You Should Know
All hot water systems in South Australia must comply with AS/NZS 3500 standards.
Incorrect installation can:
- Cause early failure
- Void warranties
- Impact home insurance claims
This is why licensed plumbing work matters.
Should You Repair or Replace a Hot Water Unit Leaking?
We always aim for the most cost-effective solution.
| Situation | Recommendation |
|---|---|
| Valve leaking | Repair |
| Pipe connection leaking | Repair |
| Unit under 8 years | Check warranty |
| Unit over 10 years & leaking from tank | Replace |
Older units are often better replaced with modern, energy-efficient systems.
Why Adelaide Homeowners Choose RD Plumbing Solutions
What to Do Right Now If Your Unit Is Leaking
- Turn off power or gas
- Isolate the water supply
- Clear the area around the unit
Call RD Plumbing Solutions on 8366 2223
Final Thoughts
A hot water unit leaking doesn’t always mean disaster. Often, it’s an early warning sign.
Whether you need a valve replacement or a full system upgrade, RD Plumbing Solutions is here to help Adelaide homeowners get back to hot showers fast.
📞 Call us 24/7 on 8366 2223
Russell is a qualified Master Plumber, having been in the industry since 2004. He started his own company in 2013, and today, is a reputable company operating in metropolitan Adelaide. We are truly your local plumber!
We specialise in all aspects of plumbing services including 24 hour emergency response, blocked drains, drain camera inspections, pipe relining, gas fitting, hot water service & replacement, rain water tanks and all other home maintenance plumbing services. We aim to exceed your expectations in everyway and deliver the level of service that has made our business what it is today.
