Replacing Gas Ducted Heating: Key Insights for Melbourne 2026

If your gas ducted heater has significantly aged — typically around 15, 20, or even 25 years — you may have noticed various changes in its performance and efficiency. It's possible that you're experiencing longer wait times for your system to warm your home adequately. Additionally, an uptick in your gas bills without any alterations in your usage habits may have raised concerns. Furthermore, the recent announcements regarding Victoria‘s shift away from gas systems might leave you contemplating how this transition will affect your specific situation and choices moving forward.

You are certainly not alone in facing this challenge. A multitude of homeowners throughout Melbourne are navigating similar predicaments, weighing the options of repairing their existing systems, replacing them with another gas heater, or making the switch to electric heating. Given the abundance of information available, it is essential to clarify the current landscape and thoroughly explore the available options for your future heating needs.

Examining the Factors Driving the Increase in Gas Ducted System Replacements

Several significant factors are converging at this pivotal moment in time.

Firstly, a considerable number of gas ducted heaters installed during the early 2000s and even the 1990s are now nearing the end of their operational lifespan. These units were initially designed to operate efficiently for a period of 15 to 20 years, with many having now exceeded that expected duration. As these systems age, sourcing replacement parts becomes increasingly difficult, their overall efficiency declines, and ultimately, it frequently becomes more financially sensible to replace them rather than to keep investing in repairs.

Furthermore, Victoria is actively promoting electrification as part of its comprehensive energy policy. Starting from January 2024, the state government will prohibit gas connections in new homes. While this does not necessitate the immediate removal of your existing gas system, it does indicate a clear trajectory towards electrification. Additionally, incentives and rebates are increasingly favouring electric systems, and the gas network is becoming more expensive to maintain, suggesting that your gas bills are likely to continue to escalate in the future.

Lastly, and perhaps most importantly, the technology surrounding reverse cycle systems has experienced remarkable advancements. A decade ago, ducted reverse cycle systems in Melbourne were often met with scepticism, primarily due to the performance limitations of older models in extreme cold conditions. Thankfully, this perception has dramatically shifted; contemporary systems now manage the chill of Melbourne winters with remarkable efficiency and reliability.

Evaluating Your Choices: Balancing the Advantages and Disadvantages

When your gas ducted heater begins to exhibit signs of failure, you typically have three potential courses of action to consider.

1. Opting to Repair Your Existing Heating System

If your heating system is under 15 years old and the issue is relatively minor—such as a malfunctioning fan motor, ignition module, or thermostat—it may be worth contemplating a repair. This could involve an expenditure of a few hundred pounds and could potentially extend the life of your unit for several additional years. However, if you discover a cracked heat exchanger (which poses a significant safety concern rather than just a comfort issue) or if your unit has surpassed the 20-year threshold, investing in repairs may lead to further complications in the future. It is essential to evaluate your system's true condition and its remaining operational lifespan honestly.

2. Upgrading to a New Gas Ducted Heating Unit

This option continues to be viable for many homeowners. Existing gas connections are allowed to remain operational—there is no immediate requirement to transition to electric. A new gas ducted heater will typically provide greater efficiency than your older model, and if your current ductwork is in good condition, you may be able to reuse it, which can help keep your costs manageable. Nevertheless, it is crucial to recognise that you would be investing in a system that relies on a fuel source from which Victoria is progressively distancing itself. Gas prices are unlikely to decrease, and potential buyers will increasingly factor in running costs when you eventually sell your home. While this choice may suit some homeowners, it is vital to approach the decision with a comprehensive understanding of the implications involved.

3. Transitioning to Ducted Reverse Cycle Electric Heating

This option is where the majority of homeowners are directing their efforts by 2026, and for compelling reasons. A ducted reverse cycle system provides both heating and cooling from a single unit. This means you can reduce your reliance on gas (or at the very least, decrease your dependence on gas for heating), lower your running costs, and qualify for Victorian Energy Upgrades (VEU) rebates, which can significantly offset your installation expenses. The downside is that the initial investment for this system is generally higher than a straightforward gas replacement, particularly if your existing ductwork needs alteration or replacement. Nonetheless, when considering the rebates, the potential for reduced ongoing costs, and the dual functionality of heating and cooling, the financial rationale typically adds up positively over a span of 5 to 7 years.

Navigating the Replacement Process: A Comprehensive Step-by-Step Guide

Many individuals seek clarity regarding what to expect during the replacement process, so here is a thorough overview of the key stages involved.

• Initial Assessment: A qualified professional will visit your home to evaluate your current system, inspect the ductwork, measure the space, and discuss your specific needs. Many installers make the error of providing quotes based on rough estimates rather than thorough load calculations. If someone offers a quote without taking accurate measurements, this should raise a significant red flag.
• Detailed Quote and Planning: You will receive a comprehensive written quote that details the unit, any necessary modifications to the ductwork, electrical work, and the process of gas disconnection. This ensures that no surprises occur on the installation day.
• Installation Day(s): For a straightforward gas-to-gas swap where the existing ductwork is reusable, the process typically requires just one day. If you are transitioning to a full reverse cycle system with new ductwork, expect the installation to last two to three days. Be aware that you will not have heating during this period, so it is advisable not to schedule it during the coldest months of July.
• System Commissioning: Following installation, the system will undergo testing, zoning will be balanced, and you will receive instructions on how to operate the system effectively. While this may seem elementary, many homeowners fail to receive proper guidance on how to utilise their new system, which can lead to confusion and potential misuse later on.

Estimating Replacement Costs: A Practical and Detailed Overview

Cost estimates can vary significantly based on your home’s size, the extent of ductwork modifications required, and the specific system you choose. However, here’s a realistic price range for Melbourne in 2026.

• Gas ducted heater replacement (reusing existing ducts): Expect prices to start around £4,500 and can go up to £7,000 for installation, depending on the unit size and brand.
• Ducted reverse cycle (full installation with new ductwork): Prices generally range from £10,000 to £18,000 or more for an average home in Melbourne. Larger homes, multiple zones, or challenging roof spaces will push costs higher.
• Ducted reverse cycle (using existing ductwork where feasible): This can cost between £7,500 and £13,000. Not every gas duct layout is suitable for reuse, but when it is, it can lead to notable savings.
• VEU rebates can reduce costs by anywhere from £1,000 to £3,000 or more, depending on your system and individual circumstances. Your installer should assist with the rebate paperwork; if they cannot, it's worth questioning why.

These figures serve as general guidelines and may not reflect your unique situation. Each home is different. If you desire a precise estimate for your home, don't hesitate to connect with us for a quote — Beyond Heating and Cooling provides this service free of charge.

Project Timeline: Understanding the Duration of the Entire Replacement Process

From your initial call to the moment your system is fully operational:

• Simple gas swap: Typically completed within a week or two after you accept the quote, with a one-day installation timeframe.
• Full reverse cycle changeover: Usually requires two to four weeks for lead time (including unit ordering and scheduling), followed by two to three days on-site for installation.
• Peak season (May–July): During these months, everything may take longer as many homeowners in Melbourne suddenly realise their heating systems are malfunctioning. If you are reading this in autumn, now is an ideal time to arrange your installation.

Essential Questions to Discuss with Your Installer Before Proceeding

Not all installers are equal, and in this line of work, the quality of installation is as critical as the equipment used. Here are some important questions to consider asking:

• Have you conducted a heat load calculation for my home? This should not be a guess but a precise calculation. Systems that are undersized won't effectively heat your home, while oversized systems waste energy by cycling on and off unnecessarily.
• Can I reuse my existing ductwork? This can vary. A reputable installer will provide a clear answer based on your specific situation and requirements.
• What brand and model are you quoting? It is essential to know precisely what you are receiving rather than a vague reference like “a 14kW system.”
• What’s the warranty — on the unit and your installation work? It's vital to differentiate between the manufacturer's warranty and the warranty provided by the installer.
• Are you licensed to perform gas disconnections? If you are transitioning from gas, a licensed gas fitter must properly disconnect your old unit. Not every HVAC company can carry out this task — Beyond Heating and Cooling can, as our team holds gas fitting licenses in addition to HVAC qualifications.
• Will you manage the VEU rebate? You shouldn't have to chase paperwork; your installer should handle that responsibility for you.

Addressing Common Concerns: Your Frequently Asked Questions Answered

Do I need to replace my gas heater with an electric one?

No, there is no legal requirement mandating the removal of an existing gas ducted heater. You can choose to repair it or replace it with another gas unit. However, it is crucial to consider that Victoria’s energy policy is shifting towards electrification, so think about the long-term implications rather than focusing solely on the present situation.

Can I keep my gas cooktop if I switch my heating to electric?

Absolutely. Transitioning your heating to a reverse cycle system does not affect your gas cooktop, hot water system, or any other gas appliances. You can gradually electrify your home if desired, but there is no requirement to convert everything to electric at once.

Is reverse cycle heating sufficient for Melbourne winters?

Yes, modern ducted reverse cycle systems are engineered to operate efficiently even at temperatures significantly lower than typically experienced in Melbourne. The outdated belief that heat pumps struggle in cold weather stems from older models that lacked capacity. Current systems perform effectively — even during those brisk 2°C mornings in July.

How can I determine if my ductwork is reusable?

A qualified installer must physically inspect your ductwork. They will evaluate size, condition (ensuring there are no significant leaks, tears, or collapsed sections), and whether the layout is compatible with the new system. Metal ductwork in good condition can often be reused, while older flexible duct that has deteriorated typically necessitates replacement.

What happens to my old gas heater?

Your installer will remove and dispose of your old unit. A licensed gas fitter will properly cap off the gas supply to the unit, so you won’t need to arrange this separately or worry about safety risks.

Will a new system help reduce my energy bills?

It should, yes. Transitioning from a 20-year-old gas ducted heater operating at approximately 60–70% efficiency to a modern reverse cycle system with a Coefficient of Performance (COP) of 4 or better will significantly lower your running costs. The exact savings will depend on your home, usage patterns, and electricity rates, but most homeowners notice a significant reduction in their overall expenses.

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If you have an ageing gas ducted system and are uncertain about your next steps, connect with Beyond Heating and Cooling. They will assess your current setup and provide honest advice on whether it’s worthwhile to repair or replace — and what the best replacement option for your home is. No pressure, no obligation, just straightforward guidance on what makes the most sense for you.