Gas ducted heating is the dominant home heating system across Melbourne’s established suburbs — a central gas furnace in the roof space or under the floor pushes warm air through ceiling or floor outlets into every room. Melbourne’s winters are cold enough to demand reliable heating (May to September, overnight temperatures regularly dropping to 5 to 8°C in the eastern and outer suburbs), and a poorly maintained ducted heater is both a comfort failure and a safety risk.
The safety dimension is what makes ducted heating maintenance different from most other home systems. A cracked heat exchanger in a gas ducted heater can allow carbon monoxide — an odourless, colourless, toxic gas — to enter the heated air stream and circulate through the home. This is why Gas Safety Victoria recommends annual professional servicing of gas ducted heaters. Use the topics in this guide to understand your system, find Melbourne pricing, and identify when to call a professional.
AnnualGas Safety Victoria recommended service interval for gas ducted heaters
$120–$250Typical Melbourne ducted heating service cost (2025)
15–25 yearsTypical lifespan of a well-maintained Melbourne ducted heater
Why Annual Servicing Matters for Melbourne Ducted Heaters
Melbourne’s gas ducted heaters sit dormant for five to six months of the year (October through April) before being called on to run hard through winter. During dormancy, the system accumulates dust in the heat exchanger and duct system, insects or rodents may enter the roof-space unit, and any corrosion or mechanical wear that began at the end of the previous season advances undisturbed. The annual service before the heating season start — typically booked in April or May — identifies these issues before the system is needed.
The most safety-critical component is the heat exchanger — the metal chamber through which combustion gases pass on one side and house air passes on the other. A hairline crack or corrosion perforation in the heat exchanger allows those combustion gases (including carbon monoxide) to enter the heated air stream. This hazard is invisible and odourless. Professional heat exchanger inspection using a combustion analyser and visual inspection tools is the only reliable way to identify it. See our carbon monoxide and ducted heating safety guide for Melbourne homeowners.
Carbon Monoxide Safety Every Melbourne home with gas ducted heating should have a carbon monoxide alarm installed near the heater and in sleeping areas. CO alarms cost $30 to $80 and are available from hardware stores. They are a critical safety layer alongside annual professional servicing.
Frequently Asked Questions — Melbourne Ducted Heating
How often should ducted heating be serviced in Melbourne?
Melbourne ducted heating systems — gas ducted heaters from Brivis, Rinnai, Braemar, and other brands — should be professionally serviced at least every two years, and ideally annually. Gas Safety Victoria recommends annual servicing of all gas ducted heaters. The service covers the heat exchanger inspection (critical for carbon monoxide safety), burner cleaning and adjustment, filter check, motor and fan inspection, flue integrity check, and a safety test of all controls. The minimum two-year interval is a regulatory recommendation; annual servicing is better practice, particularly for systems over ten years old.
How much does ducted heating service cost in Melbourne?
A professional ducted heating service in Melbourne costs $120 to $250 for a standard residential gas ducted heater. This includes the heat exchanger inspection, burner service, filter check, flue inspection, and safety controls test. Duct cleaning is quoted separately — a full residential duct clean is typically $300 to $700. Repairs (capacitor, heat exchanger, control board) are quoted additionally based on the fault found. See our ducted heating service cost guide for the full 2025 Melbourne pricing breakdown.
Is ducted heating gas or electric in Melbourne?
The large majority of ducted heating systems in Melbourne are natural gas ducted heaters — a central gas furnace in the roof space or under the floor heats air and distributes it through ductwork to ceiling or floor outlets throughout the home. Electric ducted heating also exists (typically a ducted reverse cycle or heat pump system), but in Melbourne, gas ducted heating has historically been dominant in established homes built before 2010. Victoria’s gas transition policy is encouraging new builds to use electric (reverse cycle), but the existing Melbourne housing stock has millions of gas ducted heating systems.
What are the carbon monoxide risks from ducted heating in Melbourne?
Carbon monoxide (CO) is a colourless, odourless gas produced by incomplete combustion in gas appliances. A ducted heater with a cracked or corroded heat exchanger can allow combustion gases — including CO — to enter the air distribution system and be circulated throughout the home. This is a serious health hazard — CO poisoning causes headaches, nausea, disorientation, and can be fatal at high concentrations. In Melbourne, every household with gas ducted heating should have a CO alarm installed near the heater and in sleeping areas, and the heat exchanger should be inspected at every service. Do not run a heater that shows signs of incomplete combustion (yellow flame, sooty deposits, unusual smell).
What is the lifespan of a ducted heater in Melbourne?
A Melbourne gas ducted heater from a quality brand (Brivis, Rinnai, Braemar, Bonaire) typically lasts 15 to 25 years with regular professional servicing. The heat exchanger is the critical component — most manufacturers rate their heat exchangers for 10 to 15 years under normal use. Regular servicing identifies heat exchanger deterioration before it becomes a safety issue. Systems that have been irregularly serviced or have operated in poor conditions (inadequate return air, dusty filters, high humidity in the roof space) tend toward the lower end of the lifespan range.
Should I repair or replace my ducted heater in Melbourne?
The repair-vs-replace decision for Melbourne ducted heaters typically hinges on three factors: the age of the system (systems over 15 to 18 years old are approaching the end of serviceable heat exchanger life); the nature of the fault (a cracked heat exchanger in an older system is rarely worth repairing — the cost approaches replacement and the heat exchanger will continue to deteriorate); and the cumulative cost of repairs relative to replacement cost ($2,500 to $5,000 for a new Brivis or Rinnai installed). FreshDuct provides honest condition assessments — we will tell you whether repair or replacement is more economical for your specific system.
