Gas Wall Heaters: Installation, Cost & What’s Changed

A gas wall heater remains a fast, cost-effective option to heat a living area. And yes, you can legally install or replace one today. While market options have shifted, compliant units are available for homes and rentals.

Here, we break down the installation costs, repair warning signs, and how a licensed gas fitter keeps your setup safe and certified.

What Is a Gas Wall Heater and How Does It Work?

A gas wall heater is a self-contained heating unit mounted on your wall, connected to natural gas or LPG.

Unlike central heating, it directly heats the room it’s in without ducts, eliminating conduction heat loss. It’s an efficient way to warm living areas and apartments.

Image: Reddit @baker-boot-8

And how does it work? Gas wall heaters burn fuel and transfer heat to warm a space:

1. When the thermostat signals for heat, gas flows to the burner and ignites.
2. The flames heat a heat exchanger.
3. Cool room air passes over the exchanger, warms up, and circulates via convection or a fan.
4. Combustion byproducts are safely vented or released.

You can read our guide on how gas heaters work to understand more about the basic principle of gas heating.

While the basic process is similar, gas wall heaters use one of three combustion designs:

• Balanced Flue — Draws outdoor air and vents exhaust through a sealed pipe, isolating combustion from indoor air. It’s the gold standard for safety.
• Open-Flued — Draws room air and vents outside. Exhaust fans can cause negative pressure, risking toxic backdrafts and carbon monoxide leaks. It’ll need more maintenance.
• Flueless — Releases heat and combustion byproducts straight into the room. It’s highly efficient, but requires permanent ventilation per AS/NZS 5601.1 rules and can impact indoor air quality.

Are Gas Wall Heaters Still Available in Melbourne?

Yes, but “available” doesn’t mean every old wall gas heater has a direct replacement.

Regulatory bans under AS/NZS 5263.1.3 target open-flued heaters without automatic safety shut-offs. As a result, manufacturers have retired many traditional natural-draught units like the older Braemar Ecostar.

Image: seeleyinternational.com

For internal-wall flue cavities, the main compliant option is a room-sealed heater like the Rinnai 561FT Energysaver. Because it needs an approved coaxial flue system, you can’t reuse an old natural-draught flue.

On top of that, unflued portable or wall-mounted heaters using a gas bayonet fitting aren’t viable replacements.

Victorian rules ban new indoor unflued installations, with narrow exceptions for emergency LPG replacements in strictly ventilated spaces.

So, before buying, have a licensed gasfitter check your wall cavity, flue route, clearances, and gas pipe diameter.

How Much Does It Cost to Install or Replace a Gas Wall Heater in Melbourne?

There is no reliable single installed price. Expect to pay $1,000 to $3,500 to supply and install a gas wall heater in Melbourne, based on flue complexity, wall modifications, and pipework.

Basic panel changeovers sit at the low end, but swapping old open-flued furnaces for modern sealed units costs more.

Here’s a baseline guide for Melbourne installations:

• Portable/unflued heater (unit only): $300 to $600 for compliant replacements on existing points.
• Flued gas panel heater (fully installed): $800 to $1,500 for standard single-room setups.
• Room-sealed power-flued heater (fully installed): $1,800 to $3,500+ (e.g., Rinnai Energysaver), including the unit, coaxial flue kit, and labour.
• Flue modifications and structural adaptations: $300 to $1,200 for wall or multi-storey roof runs.

A straight replacement on an accessible external wall takes 2–4 hours. Replacing outdated natural-draught open-flued furnaces like discontinued Braemar Ecostar or Vulcan models costs more.

Modern room-sealed heaters need dedicated coaxial flues that meet AS/NZS 5601.1 clearances. And oversized recessed-furnace openings might need custom infill plates or boxing for a compliant finish.

Melbourne Gas Plumber’s on-site assessments start by checking appliance supply, labour, flue adaptations, and decommissioning.

Two Scenarios: Replacing an Old Heater vs Installing for the First Time

Your situation will shape both the process and the quote:

Replacing an Ageing or Faulty Gas Wall Heater

First, check the existing flue and gas point. Can the new unit reuse them? That’s the biggest cost factor.

If the old model’s been discontinued, the gas fitter matches the closest option. Room size, gas type, flue configuration—all matter.

Modern console heaters run smaller than the built-in wall furnaces they replace. This leaves a gap in the wall that needs a custom infill trim kit or plasterboard framing.

Also, fan-forced heaters need a nearby 240V power point for the convection fan and electronic ignition. Older mechanical furnaces didn’t.

If you replace the old unit, a licensed Type A gasfitter will check that the existing gas line delivers the right operating pressure and test for leaks.

Installing a Gas Wall Heater for the First Time

You need to confirm whether your home is already connected to natural gas, or whether LPG is the practical fallback.

From there, the choice between a flued and unflued unit comes down to the room and its ventilation. An unflued heater is out of the question for a bedroom or bathroom, whatever your budget.

And if you must run gas to a new spot before the heater goes in, that’s a new gas installation job rather than a simple replacement.

Image: Reddit @Low_Connection

Putting a gas wall heater into a room with no existing point means you’ll design the gas line, electrical supply, and flue route from scratch.

Your licensed gasfitter must check that roof and wall flue terminals meet clearance distances from windows, doors, and property boundaries under AS/NZS 5601.1.

They must also verify the heater’s megajoule demand. If it drops gas pressure to your hot-water unit or cooktop, that’s a problem.

Is a Gas Wall Heater Still the Right Choice for a Melbourne Home?

For some Melbourne homes, a gas wall heater still makes sense because of:

• Lower upfront cost: It’s far cheaper than a full ducted system and meets Victoria’s rental minimum heating standards.
• Targeted warmth: It delivers fast, direct heat straight into your living space without wasting money on empty rooms.
• Fast installation: If your gas line and flue are in good shape, a changeover takes just two to four hours.

Image: Reddit @Formal_Foundation

But, the limitations matter, too:

• Single-room heating: One unit won’t warm an entire multi-room or multi-storey home.
• Strict compliance: Victoria requires compliant flued units installed to AS/NZS 5601.1, plus safety checks every two years for rentals.
• Fewer choices: With Braemar discontinuing models, Rinnai is the main brand left, often requiring trim kits to fit older cavities.

So, what replaces an old gas wall heater? Reverse-cycle split systems are your best bet. You can get a Victorian Energy Upgrades (VEU) discount, but you might face extra costs for circuit upgrades and wall repairs.

Still, a flued gas wall heater is a cheap, reliable fix for fast heat in a single living area. And for some, that’s enough.

Servicing and Compliance: What Melbourne Homeowners and Landlords Need to Know

Installing or connecting a gas wall heater isn’t a DIY job. In Victoria, only a licensed gasfitter can do it, and the work must comply with AS/NZS 5601.1:2022 and manufacturer instructions.

When a gas appliance is installed, relocated, replaced, or converted, the gasfitter must issue a Compliance Certificate. Keep it with your property records. You’ll need it for insurance, maintenance, or a future sale.

Routine servicing doesn’t always need that certificate, but get a service record anyway. Energy Safe Victoria recommends servicing gas heaters at least every two years.

A proper service goes beyond checking it starts. It covers the appliance, flue, ventilation, combustion, and the risk of carbon monoxide spillage.

Victorian rental properties have a separate rule: gas safety checks every two years.

For agreements made after 29 March 2021, a licensed gasfitter endorsed for Type A appliances must do it. From 13 October 2026, this applies to all rental agreements.

Rental providers must keep records and give renters the latest gas safety check within seven days of a written request.

So, before booking installation, replacement, or servicing, check the gasfitter’s licence or registration. And verify work classes through the Building and Plumbing Commission.

Signs Your Gas Wall Heater Needs Repair or Replacement

These warning signs mean your gas wall heater needs professional attention:

• Discoloured flame. Stop using it and have a licensed gasfitter check it. A change in flame colour, especially with soot or staining, can mean incomplete combustion and a possible toxic carbon monoxide risk.
• Ignition failure. Don’t keep resetting it. Repeated burner ignition faults need investigation. Know what you can safely check yourself from our guidance on relighting the pilot light.
• Unusual noises. Hear unusual heater noise? It might be time for a check. Note what you hear, then tell your technician. Different noises point to different issues.
• Rising gas bills. Compare actual megajoule (MJ) usage, not just the bill total. Tariff changes can raise the bill even if usage stays the same.
• Age over 15 years. Replacement makes sense when faults are frequent, parts are scarce, or the flue is deteriorating. For discontinued models like older Braemar heaters, limited parts make repairs impractical.
• You smell gas. Shut off the gas isolation valve if safe. Avoid flames and electrical switches, leave the area, and contact your gas network or LPG supplier. Call 000 if danger’s immediate.

Image: Reddit @Tyrannosaurus-WRX

Keep in mind age alone doesn’t mean replacement is needed. A licensed gasfitter can weigh condition, repair history, and parts availability, and tell you if repairing still makes sense or replacement is the better call.

Who Can Install or Service a Gas Wall Heater in Melbourne?

Only a registered or licensed gasfitter can install, replace, or connect a domestic gas heater in Victoria. Servicing a Type A appliance also needs the right specialised class.

A visit starts with the appliance, the room, the gas supply, ventilation, and the flue.

For replacement work, the gasfitter decommissions the old unit, installs and commissions the approved system, then hands over the required paperwork. It’s rarely just a quick “replacement.”

FAQ about Gas Wall Heaters in Melbourne

Here are questions Melbourne homeowners asked about gas wall heaters:

Can I still buy a new gas wall heater in Melbourne?

Yes, you can still install a gas wall heater. Victoria restricts new mains-gas connections for some builds, but replacing an appliance in a connected home is allowed if you meet the requirements.

Braemar may have stopped making traditional open-flued wall furnaces, but compliant room-sealed, power-flued options are still available. The Rinnai Energy Saver range is one example.

How much does it cost to install a gas wall heater in Melbourne?

Installation costs between $300 and $2,000.

A straightforward replacement costs less, but prices rise if you’ll need a new flue penetration, upgraded gas pipework, or a 240V power outlet.

How often should a gas wall heater be serviced?

Have a licensed Type A appliance gasfitter service the heater every two years.

A proper service clears burner lint, checks manifold and injector pressure, tests the flame-failure thermocouple, and inspects the heat exchanger.

Is gas wall heating cheaper to run than ducted heating?

For heating one room, a gas wall heater is cheaper to install and run than a ducted system, though it won’t heat the whole house.

The right choice comes down to the area you need to heat and how many rooms you want warm.

Do landlords have to service gas wall heaters in rental properties?

Yes. Under the 1997 Act and 2021 Regulations, rental properties need gas safety checks every two years, and landlords must give renters the records.

From 13 October 2026, this requirement will apply to all rental agreements, regardless of when they began.

Want to Install a Gas Wall Heater?

Gas wall heaters remain a sound, cost-effective choice for Melbourne homes, even with shifting market options driven by all-electric pushes across Victoria.

Thinking about installing one or replacing an aging unit? Getting the right fit and flue ventilation matters. Under Victorian law, a licensed gasfitter must complete gasfitting work.

Whether you need a direct replacement, or a new installation, Melbourne Gas Plumber can help. Call before 10:30am for same-day gasfitting service across Melbourne with an upfront quote before work begins.