Winter in West Melbourne is no joke. When overnight temperatures drop to single digits and your gas heater is running morning and evening, the question of what it is actually costing you becomes very real, very fast. Gas heating system in Melton and Bacchus Marsh is one of the most common heating solutions, and it’s easy to understand why. They heat up quickly, most homes already have a gas connection in place, and they’ve been the go-to choice for decades. But are gas heaters expensive to run? And how do you keep your bills under control when the cold sets in?
This guide breaks down exactly how much it costs to run a gas heater, what affects that figure, and what homeowners can do to get more warmth for less money each winter. All figures are based on current 2026 Victorian gas pricing data.
How Much Does It Cost to Run a Gas Heater Per Hour?
Before jumping to numbers, it’s worth understanding how gas heater running costs are actually worked out. The calculation is straightforward once you know the two figures involved, and it gives you a reliable way to compare different systems and usage patterns.
Step 1: Find Your Heater’s MJ/h Rating
Gas heaters are rated in megajoules per hour (MJ/h), not kilowatts like electric appliances. The MJ/h rating tells you how much gas your heater consumes each hour of operation. You will find this figure on a sticker on the unit itself, on the control panel for ducted systems, or in the product manual. Common ratings across the types of gas heaters found in Melton and Bacchus Marsh homes include:
- Small space heaters and wall furnaces: 6 to 15 MJ/h
- Medium wall furnaces and flued heaters: 15 to 25 MJ/h
- Ducted gas heating systems: 25 to 60 MJ/h depending on home size
Step 2: Find Your Gas Rate
Your gas rate is listed on your gas bill as a usage charge, expressed in cents per MJ. In Victoria in 2026, residential gas usage rates typically sit between 3.4 and 3.8 cents per MJ, depending on your retailer and plan. A realistic benchmark for Melton-area households is approximately 3.6 cents per MJ.
Step 3: Multiply the Two Together
Multiply your heater’s MJ/h rating by your gas rate to get your hourly running cost. Here are three quick examples at 3.6 cents per MJ:
- A 15 MJ/h wall furnace: 54 cents per hour
- A 20 MJ/h flued heater: 72 cents per hour
- A 40 MJ/h ducted system: $1.44 per hour
Keep in mind this is the gas consumption cost only. Your bill also includes a daily supply charge of around $0.80 to $0.90 per day regardless of how much gas you use.
Gas Heater Running Cost by Heater Type
Not all gas heaters cost the same to run. The type of system you have, its size, and its star rating all play a significant role in your gas heater running cost. Here is a breakdown of the most common types found in Melton and Bacchus Marsh homes, with realistic cost figures for each.
Portable and Unflued Gas Space Heaters
These are freestanding units that connect to a gas bayonet point in the wall. They are common in older homes and rental properties across the western suburbs. While they are inexpensive to buy, they are among the least efficient gas heating options available.
- Typical gas input: 6 to 15 MJ/h
- Estimated running cost: 22 to 54 cents per hour at 3.6 c/MJ
- Best suited to: Single rooms, short-duration heating sessions
- Important note: Unflued heaters burn gas inside the room, producing moisture and combustion byproducts. They are not recommended for extended use in enclosed spaces and are banned in bedrooms under Victorian regulations
Flued Wall Furnaces
Wall furnaces are permanently installed and vented through an external wall or ceiling. They are a very common choice in established homes across Melton and Bacchus Marsh and offer a safe, reliable heating option for living areas.
- Typical gas input: 15 to 25 MJ/h
- Estimated running cost: 54 cents to 90 cents per hour at 3.6 c/MJ
- Best suited to: Open-plan living areas or connected rooms
- Important note: Flued heaters are significantly safer than unflued units and are suitable for longer daily use
Ducted Gas Heating Systems
Ducted gas heating systems are the most powerful and widely used whole-home heating option in Victoria. A central unit located in the roof or outside pushes warm air through ducts to vents in every room. They are the most convenient option for families, but they are also the largest consumer of gas in the home.
- Typical gas input: 25 to 60 MJ/h
- Estimated running cost: 90 cents to $2.16 per hour at 3.6 c/MJ, depending on system size and star rating
- Best suited to: Whole-home heating in medium to large properties
- Practical example: A 5-star, 25 MJ/h ducted heater running six hours per day across a 90-day Melton winter season consumes approximately 13,500 MJ of gas. At 3.6 cents per MJ, that is roughly $486 in gas for the season, plus daily supply charges
What Affects How Much Gas a Heater Uses?
The MJ/h rating on the label is only part of the story. Several real-world factors influence how much gas your heater actually gets through each winter, and understanding them gives you genuine control over your bills.
Star Rating and Thermal Efficiency
A heater’s star rating reflects how efficiently it converts gas into usable heat. A higher-rated heater wastes less gas as exhaust and delivers more warmth into the room for every MJ consumed.
- A 2-star heater (common in homes built in the 1980s and 1990s) operates at roughly 60% thermal efficiency
- A 5-star heater operates at approximately 90% efficiency
- Over a 90-day Melton winter, a 2-star 25 MJ/h heater can use around 22,500 MJ versus 13,500 MJ for a 5-star equivalent. At 3.6 cents per MJ, that difference is around $324 per heating season
Thermostat Setting
Every degree above 21°C on your thermostat adds approximately 10% to your heating cost. A home set to 23°C costs roughly 20% more to heat than the same home set to 21°C. This single adjustment can make a meaningful difference to your quarterly gas bill, particularly in a larger Melton or Bacchus Marsh home where a ducted system is working hard to heat multiple zones.
- Recommended thermostat range for efficiency: 18°C to 21°C
- Each degree reduction saves approximately 10% on your heating energy use
- Using a timer to heat the home only during waking hours (morning and evening) rather than running continuously can halve your daily gas consumption
Daily Runtime
How many hours per day your heater runs is one of the biggest variables in your total gas heater cost. A ducted system running 8 hours per day costs significantly more than one running 4 hours on a timer.
- A 4-star ducted heater rated at 25 MJ/h running 4 hours per day: approximately $1.30 per day in gas
- The same heater running 8 hours per day: approximately $2.59 per day, or around $77 per month during winter
- Running 10 hours per day across a full Melton winter season (90 days): approximately $324 in gas for that heater alone
Home Insulation and Draughts
A poorly insulated home forces your heater to work harder and run longer to maintain a comfortable temperature. Sealing gaps under doors, around windows, and in the ceiling space can reduce your heating bill by 15 to 25% for a $50 to $200 investment in foam seals and draught excluders. Good ceiling insulation can slash gas bills by up to 15% on its own.
System Age and Service History
An older heater that has not been serviced recently is likely running at well below its rated efficiency. Dirty burners, blocked filters, and worn components all increase gas consumption without delivering more heat. A well-tuned heater with a clean heat exchanger operates at its rated efficiency. A dirty or poorly maintained system wastes gas.
- Annual servicing by a licensed technician ensures your heater is burning gas at its rated efficiency
- Systems 10 years or older may be consuming 20 to 40% more gas than a modern equivalent for the same heat output
- Replacement of a 2-star system with a modern 5 or 6-star unit can pay for itself in gas savings within a few years
Are Gas Heaters Expensive to Run Compared to Other Options?
This is one of the most common questions homeowners in Melton and Bacchus Marsh ask, and the honest answer depends on the type of heater you are comparing and your specific situation.
Gas vs Electric Bar Heaters
Standard electric bar or panel heaters are typically more expensive to run than gas for the same heat output. Electricity in Victoria currently costs around 35 cents per kWh for most households, while producing the same 8.5 MJ of heat via a gas heater costs approximately 31 cents at 3.6 c/MJ. An electric heater producing the same output would cost closer to 77 cents per hour.
- Gas heater running cost per hour (moderate setting, 8.5 MJ/h): approximately 31 cents
- Electric panel heater producing equivalent heat (2.36 kW): approximately 77 cents per hour at 35 c/kWh
- Gas is significantly cheaper per unit of heat than standard electric resistance heating
Gas vs Reverse Cycle Split System
Modern reverse cycle split systems (heat pumps) are the most energy-efficient heating technology available for most households. They use electricity but move heat rather than generate it, achieving efficiencies of 300% to 500%. This means a 3.5 kW reverse cycle system costs approximately $0.28 to $0.36 per hour to run, compared to $0.50 to $0.72 per hour for ducted gas heating at current Victorian rates.
- Reverse cycle split system (3.5 kW): approximately $0.28 to $0.36 per hour
- Ducted gas heating: approximately $0.50 to $0.80 per hour depending on system size
- For smaller spaces, a reverse cycle split system is generally cheaper to run than gas ducted heating
- For whole-home heating in larger Melton properties, gas ducted systems can still be competitive depending on the gas plan and system age
How to Reduce Your Gas Heater Running Cost
Whether you have a wall furnace, a space heater, or a full ducted gas heating system, there are practical steps you can take right now to reduce your gas heater cost without sacrificing comfort. These apply directly to homes in Melton, Bacchus Marsh, and the surrounding western suburbs.
Set a Timer and Use Zones
Running your ducted system only when you need it is the single most effective way to cut your gas bill. Use the built-in timer to heat the home in the morning before waking and in the evening, then turn it off overnight. If your ducted system has zoning, close off unused rooms so the heater only conditions the spaces you actually occupy.
- A timer set to run 4 hours per day instead of 8 hours can cut your seasonal heating gas cost roughly in half
- Closing off 2 to 3 zones in a 4-zone ducted system reduces the volume of air being heated, allowing the system to reach target temperature faster and cycle off sooner
Lower the Thermostat by 2 Degrees
Setting your thermostat to 19°C instead of 21°C saves approximately 20% on your heating energy use. Put on an extra layer and let the heater work less. For a family running a ducted system for 90 winter days, that is a meaningful saving on the gas bill.
Seal Draughts and Improve Insulation
Every gap under a door or around a window lets warm air out and cold air in, forcing your heater to run longer. Foam draught excluders, door snakes, and window seals are cheap and effective. If your ceiling insulation is thin or absent, adding it is one of the highest-return upgrades you can make to reduce your gas heater running cost over many winters.
Service Your System Annually
A dirty burner, clogged filter, or worn heat exchanger makes your heater consume more gas to produce the same output. Annual servicing by a licensed heating technician keeps your system running at its rated efficiency and often pays for itself in reduced gas consumption over the course of the winter.
- A clean, well-serviced ducted system operates at its rated star efficiency
- A neglected system can consume 20 to 40% more gas than rated, costing hundreds of extra dollars per season
- Annual servicing also catches faults early, preventing expensive repairs mid-winter
Compare Your Gas Plan
Victorian Energy Compare (the government comparison tool) allows you to compare gas retailers and plans by postcode. For Melton and Bacchus Marsh households using significant gas for heating, switching from a standing offer to a competitive market offer can reduce your per-MJ rate by 10 to 20%, which translates directly into lower gas heater costs every day the system runs.
When to Consider Replacing Your Gas Heater
There comes a point where a heater costs more to run and repair than a modern replacement would. For homeowners in Melton and Bacchus Marsh with older gas heating systems, it’s worth knowing the signs that replacement will save money in the long run.
- Your heater is more than 15 years old and has a 2 or 3-star rating
- You have had two or more repairs in the past two years
- Your gas bills have increased noticeably without a change in your usage habits
- The heater is producing uneven warmth or struggling to reach set temperature
- You can hear unusual noises during operation that were not there previously
- A licensed technician has flagged the heat exchanger as cracked or degraded (a safety issue as well as an efficiency one)
Replacing a 2-star 25 MJ/h system with a modern 5-star equivalent can save around $324 in gas per heating season. In most cases, the system pays for itself in energy savings within a few winters.
Frequently Asked Questions
How much does it cost to run a gas heater per hour in Victoria?
It depends on your heater’s MJ/h rating and your gas rate. At 3.6 cents per MJ (a typical 2026 Victorian residential rate), a 15 MJ/h wall furnace costs approximately 54 cents per hour, a 20 MJ/h heater costs around 72 cents per hour, and a 40 MJ/h ducted system costs approximately $1.44 per hour to run.
Are gas heaters expensive to run compared to electric heaters?
Compared to standard electric bar or panel heaters, gas is significantly cheaper per unit of heat produced. However, modern reverse cycle split systems (heat pumps) are the most cost-effective heating technology and can be cheaper to run than gas ducted systems, particularly for smaller spaces or households with rooftop solar.
How much does a gas heater cost to run per day?
A typical ducted gas heating system running 6 hours per day at 25 MJ/h and 3.6 cents per MJ costs approximately $5.40 per day in gas consumption alone, plus the daily supply charge of around $0.85. A smaller wall furnace running 4 hours per day at 20 MJ/h costs approximately $2.59 per day.
How much gas does a heater use in a month?
A family of four with a ducted gas heating system running 6 to 8 hours per day through a Melton winter would typically use between 4,500 and 7,200 MJ of gas for heating over a 30-day month. At 3.6 cents per MJ, that is approximately $162 to $259 per month in gas for heating, before supply charges.
What is the most efficient gas heater?
A modern 5 or 6-star rated ducted gas heating system or high-star wall furnace is the most efficient gas option. However, if you are considering a new system and your property has access to rooftop solar, a high-efficiency reverse cycle heat pump system may offer lower running costs over time. A licensed heating technician can assess your home and recommend the most cost-effective option for your specific situation.
Does servicing my gas heater reduce running costs?
Yes. Annual servicing by a licensed technician keeps your heater operating at its rated efficiency. A poorly maintained system can consume 20 to 40% more gas than a well-serviced equivalent for the same heat output. Over a full winter season, that extra consumption can cost hundreds of dollars. Servicing also extends the system’s lifespan and helps avoid mid-winter breakdowns.
Conclusion
Understanding your gas heater cost per hour is the first step toward taking control of your winter energy bills. Whether you have a simple wall furnace, a ducted gas heating system, or you are thinking about upgrading to a more efficient option, the team at New Image Heating and Cooling Melton is here to help homeowners get more from their heating systems.
From annual gas heater servicing that restores peak efficiency to honest advice on whether repair or replacement makes better financial sense, we give you the full picture without the pressure. We service all makes and models across West Melbourne, and we’re available for same-day bookings on urgent heating issues.
Call us on 0468 125 098 or request a free quote via our online form. Stay warm this winter, without the bill shock.
