Your gas heater can produce carbon monoxide if it’s not burning fuel properly, regardless of its age. Norwood’s concentration of established homes with older gas heaters makes this a genuine local risk, particularly in heaters that have never been serviced.
Exceed Plumbing has tested gas heaters for carbon monoxide across Norwood for nearly a decade. This guide covers the local risk, warning signs, when to call a gas fitter, and how to stay safe.
Why Norwood Faces a Real Carbon Monoxide Risk
Norwood is one of Adelaide’s oldest municipalities. Kensington and Norwood were the first townships outside the City of Adelaide to be granted their own local government, and that history shows in the housing stock today.
Victorian villas, Edwardian cottages, and 1920s bungalows dominate the suburb, many of which are protected under heritage controls through the City of Norwood Payneham & St Peters. Older homes like these often still run original open-flued gas heaters installed decades ago.
SA Health confirms unflued and poorly maintained gas heaters are a genuine carbon monoxide risk in South Australian homes. I test heaters across Norwood regularly, and the pattern is consistent.
The older the heater, the higher the chance it’s never had a proper service.
What Causes Carbon Monoxide From a Gas Heater
Carbon monoxide is produced when gas doesn’t burn cleanly. Here’s what typically causes it:
- Incomplete combustion. A gas heater that isn’t getting enough air, or has a dirty burner, doesn’t burn fuel fully. That incomplete burn produces carbon monoxide as a byproduct.
- Blocked or corroded flues. Flues carry combustion gases safely outside. A blocked, cracked, or corroded flue lets those gases spill back into the room instead.
- Ageing heat exchangers. Over the decades, a heater’s internal heat exchanger can crack or corrode, allowing combustion gases to mix with the air the heater blows into your home.
- Poor ventilation in sealed homes. Modern draught-proofing and renovations can reduce airflow around older heaters that were designed for a leakier house.
- Never being serviced. Energy & Mining SA recommends regular servicing and maintenance of all gas appliances specifically to catch these faults before they become dangerous.
Carbon Monoxide Warning Sign Diagnostic Table
Match what you’re seeing or feeling to the likely cause and the right response:
| What You’re Noticing | Likely Cause | What To Do |
| Yellow or orange flame instead of blue | Incomplete combustion | Turn off, book a gas safety inspection |
| Soot marks near the heater | Incomplete combustion | Turn off, book a gas safety inspection |
| Unusual smell or noise from the heater | Possible flue or burner fault | Turn off, book a gas safety inspection |
| Headaches or drowsiness only when heater is on | Possible carbon monoxide exposure | Ventilate, turn off, call a licensed gas fitter |
| Heater has never been serviced | Unknown internal condition | Book a gas safety inspection |
| Condensation or damp near a flued heater | Possible flue fault | Book a gas safety inspection |
What You Can Check Safely Before Calling a Gas Fitter
Carbon monoxide itself is undetectable without equipment, but these visible warning signs are safe to check yourself:
- Look at the flame colour. A healthy gas flame burns blue. Yellow, orange, or flickering flames point to incomplete combustion.
- Check for soot or scorch marks. Dark marks around the heater’s vents or casing are a sign it isn’t burning cleanly.
- Note when symptoms happen. If headaches, dizziness, or nausea only appear when the heater is running and ease once you’re outside, treat that as a warning sign.
- Check your service history. If you can’t remember the last service, or it’s been more than two years, that alone is reason to book one.
More: What Are the Signs of a Gas Leak and What to Do?
When to Call a Licensed Gas Fitter in Norwood
Some situations need immediate professional attention rather than a routine booking.
You Suspect Active Carbon Monoxide Exposure
If anyone has sudden headaches, dizziness, nausea, or confusion while the heater is running, act immediately:
- Turn the heater off
- Open doors and windows
- Get everyone outside into fresh air
- Call 000 if anyone shows severe symptoms
- Call a licensed gas fitter before using the heater again
The Heater Has Never Been Serviced
An unserviced heater of any age is an unknown risk. Booking an inspection is the only way to know whether it’s operating safely.
You Notice Any Warning Signs From the Table Above
Yellow flames, soot, unusual smells, or symptoms associated with heater use all warrant a professional inspection before the heater is used again.
What Our Gas Fitters Actually Do on Arrival
In nearly a decade of testing gas heaters across Norwood, this process catches the fault every time:
- Test the flame and combustion quality
- Check the flue for blockages, cracks, or corrosion
- Inspect the heat exchanger for damage
- Measure carbon monoxide output with calibrated equipment
- Confirm the room has adequate ventilation for the heater type
You get a clear explanation of what was found, a fixed-price quote before any work begins, and a compliance certificate once the job is done.
Recently, the team and I diagnosed a fault in the ducted gas heating system of a Norwood home that other plumbers had missed. Karon Day shared this feedback:
“Daniel was very friendly, professional and informative. He quickly diagnosed the issue with my ducted gas heating and explained the problem clearly to me. Although I felt the service was costly, he listened to me and fixed the fault which other plumbers hadn’t. I would recommend Daniel and Exceed Plumbers for all your plumbing needs. Thank you, Daniel and Exceed, for your service.”
At Exceed Plumbing, finding the fault others miss is standard on every gas safety job.
Why Norwood’s Housing Era Matters for Gas Safety
Not every part of Norwood carries the same risk. The suburb’s age varies street by street, and so does the heating installed in each era.
- Victorian and Edwardian homes near The Parade. Built from the 1880s through the early 1900s, these are Norwood’s oldest properties. Many retain original chimney breasts now fitted with mid-century gas heaters that predate modern safety standards.
- 1920s and 1930s bungalows. This era introduced built-in gas wall furnaces and early ducted systems, some of which are still in service decades later without ever being upgraded.
- Renovated character homes. Draught-proofing and double glazing improve comfort but reduce the natural ventilation older open-flued heaters were designed to rely on.
- Rental properties with older systems. Established suburbs like Norwood have a high proportion of rental homes, where heater servicing can be inconsistent between tenancies.
More: Hot Water Running Out in Blackwood? Causes and Fixes
How to Prevent Carbon Monoxide Risk in a Norwood Home
Prevention here comes down to servicing, ventilation, and knowing the warning signs. The team at Exceed Plumbing recommends the following:
Book a Service Every Two Years at Minimum
SA Health recommends servicing gas appliances at the manufacturer’s interval or at least once every two years. For a heater with an unknown history, book a service now rather than waiting.
Install a Carbon Monoxide Detector
A detector gives you an early warning that a smell or a change in flame colour can’t. It’s a low-cost backup, not a replacement for regular servicing.
Never Block Ventilation Near an Open-Flued Heater
Renovations, draught stoppers, and furniture placement can all restrict the airflow an older heater depends on. Keep the area around any open-flued heater clear.
Know the Signs and Act on Them
A yellow flame, soot marks, or symptoms tied to heater use are not things to wait out. Using gas appliances safely means treating any of these as a reason to turn the heater off and book an inspection.
More: Why Does My Shower Go Hot and Cold? How to Fix It
Adelaide Suburbs We Service
Exceed Plumbing tests and services gas heaters for carbon monoxide across the entire Adelaide metropolitan area. Whether it’s an older open-flued heater in Norwood, a ducted system in Prospect, or a gas safety check in Colonel Light Gardens, our licensed gas fitters find the fault and fix it properly. We also cover Salisbury, Mawson Lakes, Morphett Vale, Goodwood, Linden Park, Modbury, West Lakes, Fulham Gardens, Mount Barker, Blackwood, Paralowie, Elizabeth, Golden Grove, Noarlunga, Happy Valley, Magill, Burnside, West Beach, Stirling, Mitcham, and Pooraka.
Get Your Gas Heater Tested in Norwood Today
If your gas heater has never been serviced or you’ve noticed any warning signs, call our emergency gas fitters at Exceed Plumbing on (08) 7948 7662 for same-day gas safety testing.
- Within-the-hour service, 24/7
- Fixed upfront pricing, no hidden costs
- Fully licensed and insured (Licence #333997)
- Guaranteed workmanship on every job
Frequently Asked Questions
Is my gas heater producing carbon monoxide specifically in Norwood?
Any gas heater can produce carbon monoxide if it isn’t burning fuel properly, but Norwood’s high concentration of older homes with original open-flued heaters raises the risk. Regular servicing is the only way to confirm your specific heater is safe.
Can I smell carbon monoxide from my gas heater?
No. Carbon monoxide has no smell, taste, or colour, unlike a gas leak, which has a distinct rotten egg odour added deliberately. This is why carbon monoxide is called the silent killer and why a detector matters.
What does a yellow flame on my gas heater mean?
A healthy gas flame burns blue. A yellow, orange, or flickering flame means the gas isn’t burning completely, which is a direct sign of carbon monoxide production. Turn the heater off and book a gas safety inspection.
How often should I get my gas heater serviced?
At least once every two years, or at the interval recommended by the manufacturer, whichever comes first. Heaters with an unknown service history should be checked as soon as possible regardless of age.
What should I do if I think someone has carbon monoxide poisoning?
Turn off the heater, open doors and windows, and get everyone outside into fresh air immediately. Call 000 if anyone shows severe symptoms like confusion or loss of consciousness. Don’t use the heater again until a licensed gas fitter has checked it.
Does Exceed Plumbing offer emergency gas safety testing in Norwood?
Yes. Exceed Plumbing provides 24/7 emergency gas heater testing across Norwood and the wider Adelaide area. Our within-the-hour response means a licensed gas fitter can test your heater and confirm it’s safe. Call (08) 7948 7662 any time.
