🔥 Common Issues and Maintenance for Storage Gas Hot Water Systems in Australian Homes
Storage gas hot water systems are one of the most popular choices for Melbourne households thanks to their reliability, fast heating, and consistent performance. But like any appliance, they require regular maintenance — and can develop issues over time if neglected.
Understanding how your gas hot water system works and spotting early warning signs can save you from expensive repairs, water damage, or complete system failure.
In this guide, the team at Fox Plumbing & Drainage breaks down the most common problems, maintenance tips, and professional solutions for keeping your storage gas hot water system in peak condition.
🔥 1. Pilot Light Problems
If your water suddenly turns cold, the pilot light is one of the first things to check.
The pilot light ignites the burner that heats your water. When it goes out, your system won’t function at all.
Common causes include:
A draft blowing out the flame
A dirty pilot tube blocking gas flow
A faulty thermocouple that fails to detect the flame
💡 Quick Tip: If your pilot light keeps going out, don’t keep relighting it — that can indicate a failing thermocouple or gas control valve. Call a licensed plumber or gasfitter for inspection and repair.
🌡️ 2. Thermostat or Gas Control Valve Failure
A malfunctioning thermostat can cause your water to be too hot or too cold, wasting energy and creating inconsistent temperatures.
Sometimes, the gas control valve (which regulates gas flow to the burner) can also fail.
How to prevent it:
Check that your thermostat is set between 60°C–65°C (safe and efficient).
If the water temperature fluctuates or the system overheats, it’s time to have the thermostat tested or replaced by a plumber.
🪨 3. Sediment Buildup Inside the Tank
Melbourne’s water contains natural minerals like calcium and magnesium. Over time, these form sediment at the bottom of your hot water tank.
This can cause:
Rumbling or popping noises
Reduced heating efficiency
Premature wear on the tank and burner
🧰 Maintenance Tip: Flush the tank every 6–12 months to remove sediment and improve heating performance. A licensed plumber can do this safely while checking for corrosion or gas leaks.
💧 4. Leaking Hot Water Tank
A leaking storage tank is a serious problem that requires immediate attention.
Leaks can be caused by:
Corrosion from inside the tank
Cracked welds or seams
Loose fittings or valves
If you notice water pooling around your unit, turn off the gas supply and cold water inlet valve immediately and contact a plumber.
Once a tank starts leaking due to rust, it usually means it’s time for a replacement system.
⚙️ 5. Pressure Relief Valve Issues
The pressure relief valve (PRV) is a key safety component that prevents the tank from over-pressurizing.
If it’s faulty, you may experience leaks, hissing noises, or water discharge.
To test it safely:
Lift the valve’s test lever slightly — you should hear a short burst of water escape, then stop.
If it drips continuously or doesn’t release pressure, the valve should be replaced.
⚠️ Never block or cap off a leaking pressure relief valve — it’s a safety risk and can cause a tank explosion.
🧰 Routine Maintenance Tips for Gas Hot Water Systems
Regular maintenance helps your hot water system run efficiently, safely, and for longer.
Here’s a quick checklist every homeowner should follow:
✅ Check the pilot light monthly to ensure it burns steadily.
✅ Inspect for leaks around valves and plumbing connections.
✅ Flush the tank annually to remove sediment.
✅ Test the PRV every 6 months.
✅ Monitor temperature and gas pressure for irregularities.
✅ Book a professional service every 2 years for a full safety check.
Keeping up with maintenance can extend your system’s life to 12–15 years or more.
👨🔧 Professional Gas Hot Water Services in Melbourne
If your storage gas hot water system isn’t performing as it should, it’s best to call a licensed gas plumber.
At Fox Plumbing & Drainage, we provide:
Expert diagnosis and repair of all major brands (Rheem, Dux, Rinnai, Vulcan, AquaMAX)
Pilot light relighting and thermocouple replacement
Tank flushing and PRV testing
Full system replacements with compliance certificates
24/7 emergency plumbing across Melbourne’s west
We service Melton, Caroline Springs, Taylors Lakes, Werribee, Tarneit, and surrounding suburbs, ensuring your home always has reliable hot water.
🔧 Why Choose a Licensed Plumber?
Gas work must be performed by a qualified and licensed gasfitter. DIY repairs or unlicensed work can void your warranty, cause gas leaks, and pose safety risks.
Fox Plumbing & Drainage guarantees:
Fully licensed & insured plumbers
Upfront pricing and honest advice
Compliance certificates on completion
Fast same-day service for urgent hot water issues
🌡️ Final Thoughts
Your storage gas hot water system is one of the hardest-working appliances in your home.
With regular care — and help from a trusted local plumber — it can deliver years of safe, efficient performance.
Don’t wait until you’re out of hot water.
📞 Call Fox Plumbing & Drainage today on 0405 900 418 for professional hot water maintenance, repairs, and installations across Melbourne’s western suburbs.