Your heater stops working on a cold Melbourne morning. The house drops to 12 degrees by 8am, the kids are complaining, and you’re staring at a unit that hasn’t caused you trouble in years – until now.
The first question most homeowners ask is: “Should I get it fixed, or is it time to replace the whole thing?”
It’s a fair question, and the honest answer depends on a few specific factors. Age, the type of fault, your recent gas bills, and the condition of one critical internal component all play a role. Get the call right and you save money. Get it wrong and you either spend hundreds on a repair that buys you one more winter, or you replace a heater that had years of life left in it.
This guide walks you through exactly how Speedy Services Today will help you make that decision.
Start Here: The 15-Year Rule
Every gas appliance has a safe operational lifespan. For ducted heating systems, that window is generally 15 to 20 years.
The reason comes down to a component called the heat exchanger – the metal chamber that holds the combustion flames and heats the air before it’s pushed into your home. Over years of expanding and contracting with extreme heat, the metal stresses and eventually develops cracks.
Once a heat exchanger cracks, the unit is permanently unsafe to use. A cracked heat exchanger allows carbon monoxide to mix with the air flowing through your ductwork and into every room in your home. Carbon monoxide is colourless, odourless, and dangerous in enclosed spaces.
So here’s the practical rule: if your heater is approaching or past the 15-year mark and requires a major component repair – a fan motor, an ignition control board, a gas valve – the repair rarely makes financial sense. You might spend $500 fixing the fan motor today, only to face a cracked heat exchanger next winter.
When Repairing Your Heater Makes Sense
Not every breakdown points to replacement. If your unit is relatively new, a targeted repair is the right move.
Consider repairing if:
The unit is under 10 years old. Most modern heaters are built to last well beyond a decade. A fault in year six or seven is usually a wear-and-tear issue, not a sign the unit is finished.
The repair is minor. A faulty thermostat, a dirty flame sensor, a blown fuse – these are standard maintenance issues. A licensed gasfitter can typically resolve them in a single visit.
Your gas bills have stayed consistent. If the unit heats efficiently and the capacity still suits your home’s layout, there’s no financial case for replacing it.
The heat exchanger is intact. This is the most important factor. If a licensed gasfitter confirms the heat exchanger is completely sealed and safe, the core of your unit is still viable and worth protecting.
5 Signs Your Heater Needs to Be Replaced
If your unit falls outside the repair window, you need to look for the physical warning signs of a system that’s reached the end of its life. Based on our diagnostic work across Melbourne’s north-west, these are the five indicators we see most often.
1. The Unit Is Past Its Safe Operational Lifespan
Age is the single biggest factor in heating failures. We recently attended a property in Seymour where the homeowner was relying on a gas central heater that was over 30 years old. It was inefficient, loud, and struggling to heat the home to a comfortable temperature. We removed the old system and installed a modern Braemar 25kW unit. The homeowner noticed an immediate change in both comfort and the noise level in the house.
If you’re unsure how old your heater is, check the compliance plate on the side of the unit or search the brand and model number online.
2. A Yellow Pilot Light or Suspected Carbon Monoxide
A healthy gas flame burns crisp and blue. If your pilot light or burners are burning yellow or orange, or producing visible soot deposits, the gas is not combusting properly. This is a serious warning sign – not something to monitor and revisit next week.
Improper combustion produces carbon monoxide. We recently responded to an urgent call in Sunbury where an aging Brivis ducted heater had failed entirely. Our inspection found a cracked heat exchanger. Because the crack allowed carbon monoxide to enter the airflow, repair was not an option. We safely disconnected the unit and replaced it with a Braemar TQ320 in-ceiling system the same day.
If you see yellow or orange flames, stop using the heater and call a licensed gasfitter immediately.
3. Rising Gas Bills for the Same Level of Heat
Heaters lose efficiency as they age. Burners clog, fans slow down, and internal components wear out. The system compensates by burning more gas to reach the temperature set on your thermostat.
A homeowner in Wallan contacted us because their 25-year-old system was running almost constantly but still failing to heat the house properly. The efficiency had dropped to the point where the unit was costing significantly more to run than it should. We replaced it with an energy-efficient Braemar unit. The new system produced a noticeably better result while using less gas.
If your winter bills are climbing year on year but your usage habits haven’t changed, the heater is the likely cause.
4. Strange Noises or Major Electrical Faults
A properly functioning gas heater produces a steady, consistent hum. Loud banging when the system fires up, screeching during operation, or persistent rattling usually points to a failing fan motor or worn bearings.
Electrical faults are another clear end-of-life indicator. We attended a job in East Croydon where a ducted gas heater kept tripping the home’s circuit breaker before shutting down completely. Power surges had caused fusion damage to the main control board. Sourcing a compatible replacement board for an old system is difficult and expensive. The most practical path was replacing the unit with a new gas ducted heater – one that came with a fresh five-year parts warranty.
5. Uneven Heating and Poor Airflow
Cold rooms at the far end of the house while the rooms near the unit are comfortable is a classic sign of a struggling system. While collapsed or damaged ductwork can cause this, it often points to a fan motor that’s no longer powerful enough to push air to the furthest vents.
If a licensed plumber inspects your ductwork and finds it’s in good condition, the main unit is the likely culprit.
What About Converting to Electric?
With the ongoing push to reduce gas emissions and lower household running costs, many Melbourne homeowners are choosing to move away from gas entirely when their ducted heater reaches end of life.
Options like reverse cycle ducted air conditioning or a multi-head split system give you both heating and cooling from a single unit. Depending on the system you choose, you may also qualify for a rebate under the Victorian Energy Upgrades program. It’s worth getting a quote that covers both a gas-for-gas replacement and an electric conversion so you can weigh the full financial picture.
What to Expect from a Modern Replacement Unit
If you decide to replace your system, the practical benefits are immediate.
Modern ducted heaters carry energy star ratings of up to 7 stars – a significant leap over systems installed 15 to 20 years ago. Top-of-the-range models like the Braemar TQ320 also include a 10-year warranty on the heat exchanger, giving you long-term protection on the component that matters most. Advances in fan technology mean new units run considerably quieter than older ducted models, and replacement also gives your technician the chance to correctly size the unit to your current floor plan rather than the one from two decades ago.
How a Gas Ducted Heating Replacement Works
A standard installation with a licensed professional typically takes less than a day from start to finish.
The process runs as follows:
- Site inspection – The plumber assesses your existing unit, checks your ductwork, and measures your gas line sizing.
- Fixed-price quote – You receive upfront pricing with the exact model and all labour costs outlined before any work begins.
- Safe removal – The old system is isolated from both the gas and electricity supply, then disconnected and removed from site.
- Installation and testing – The new unit is secured, connected to your duct network, and put through full electrical and gas safety checks. The technician confirms the thermostat communicates correctly with the unit before leaving.
- Compliance and handover – The site is cleaned, the old unit is taken away for disposal, and you receive a compliance certificate proving the work meets all legal requirements.
Not Sure Where Your Heater Stands?
You don’t have to guess. If you’re dealing with cold spots, climbing bills, or a system that’s been unreliable through the last few winters, a professional assessment gives you a clear answer.
A licensed gasfitter can test your heat exchanger, measure carbon monoxide levels, and give you a straightforward breakdown of repair costs versus replacement – with no pressure either way.
At Speedy Services Today, we offer a Heater Check that covers a full condition report on your unit. If your system has failed completely, we manage emergency gas ducted heating services across Melbourne’s north-west with upfront pricing and a lifetime workmanship guarantee on every installation.