Electric Heater vs Gas Heater vs Heat Pump Costs Compared for Australian Homes

For most rooms, a heat pump costs less to operate than a natural-gas heater or portable electric heater. The archived Sustainability Victoria heating-cost calculator estimated annual costs of $191 for a 3-star reverse-cycle air conditioner, $650 for a 3-star natural-gas heater, $860 for a portable electric resistance heater and $1,037 for a 3-star LPG heater in a medium-sized room.

The figures were last updated in July 2025 and are based on a pre-2005 Melbourne home heated to 20°C using mid-2025 Melbourne energy tariffs. Actual costs depend on local tariffs, climate, insulation, thermostat settings and operating time.

This guide compares the running costs, upfront costs, safety considerations and backup-power options for electric heaters, gas heaters and heat pumps in Australian homes.

Key Takeaways

• Reverse-cycle heat pumps had the lowest annual running costs in Sustainability Victoria’s archived comparisons.

• Portable electric heaters cost relatively little to purchase but more to operate than reverse-cycle and natural-gas room heaters in the cited scenarios. LPG cost even more.

• Faulty, poorly maintained or inadequately ventilated gas heaters can create a serious carbon-monoxide risk.

• From January 2027, new Victorian homes and many new commercial buildings must generally be all-electric, subject to exemptions.

• A portable power station can temporarily run a compatible plug-in heater during an outage, but it does not automatically power a hardwired heat pump or ducted system.

Exploring Your Main Heating Options

Heat Pumps and Reverse-Cycle Air Conditioners

A reverse-cycle air conditioner absorbs thermal energy from the outdoor air and transfers it indoors through a sealed refrigerant circuit. It does not bring outdoor air directly into the room.

According to the Australian Government’s heating and cooling guidance, reverse-cycle systems can provide approximately three to six units of heating energy for every unit of electricity consumed.

Pros and Cons

• Pro: Lowest running costs in the archived comparisons.

• Pro: Provides both heating and cooling.

• Pro: Suitable for regular room or whole-home heating when correctly sized.

• Con: Higher purchase and installation costs than a portable heater.

• Con: Performance may decrease in very cold conditions.

Gas Heaters

Gas heaters burn natural gas or LPG. Flued models direct combustion gases outside, while unflued models release them into the room and require adequate ventilation.

Open-flued heaters draw combustion air from inside the room. Exhaust fans and other sources of negative pressure can cause combustion gases to spill back indoors.

Gas-heater efficiency varies by model, design, installation and heater type. Sustainability Victoria’s room-heating comparison included selected 3-star and 4.5-star gas heaters, but these do not represent every model available.

Gas-Heater Safety

Faulty, poorly maintained or inadequately ventilated gas heaters can create a serious carbon-monoxide risk. Carbon monoxide is poisonous and may cause serious illness or death.

According to Energy Safe Victoria’s gas-heater safety guidance:

• Open-flued heaters can spill combustion gases under negative-pressure conditions.

• Unflued heaters release combustion products into the room and require adequate ventilation.

• Gas heaters should be serviced by a qualified gasfitter at least once every two years.

• Carbon-monoxide alarms provide additional protection but do not replace correct installation, ventilation and servicing.

Victoria does not prohibit every open-flued heater. Since 1 August 2022, the sale and installation of open-flued gas space heaters without the required automatic safety-shutdown capability have been prohibited. Certified models that satisfy the current requirements remain permitted. See Energy Safe Victoria’s open-flued heater guidance.

Pros and Cons

• Pro: Can heat large rooms quickly.

• Pro: Ducted systems can heat several rooms.

• Pro: May remain practical in homes with an existing serviceable system.

• Con: Higher running costs than reverse-cycle heating in the archived comparisons.

• Con: Requires regular professional servicing.

• Con: Incorrect installation, poor ventilation or faulty operation can create a serious carbon-monoxide risk.

Portable Electric Heaters

Portable electric heaters convert electricity directly into heat. Common types include fan, panel, radiant and oil-filled column heaters.

Almost all the electricity consumed becomes heat at the point of use. However, one unit of electricity produces approximately one unit of heat, compared with the three to six units that a reverse-cycle system may transfer.

Pros and Cons

• Pro: Relatively inexpensive to purchase.

• Pro: Requires no fixed installation.

• Pro: Easy to move between rooms.

• Pro: Practical for short-duration heating in one room.

• Con: Higher running costs than reverse-cycle and natural-gas room heating in the cited scenarios.

• Con: Generally unsuitable for whole-home heating.

Heating Costs Compared

The following annual running costs come from Sustainability Victoria’s archived 2025 calculator. They assume:

• A pre-2005 Melbourne home.

• An indoor temperature of 20°C.

• Mid-2025 Melbourne energy tariffs.

• The room or home sizes shown below.

They are not current national 2026 prices.

Indicative upfront costs come from separate Australian consumer and trade guides. Actual quotes depend on equipment size, brand, electrical work, gas connections, property layout and installation complexity.

Room-Heating Costs

Whole-Home Heating Costs for a 160m² Home

Reverse-cycle heating had the lowest annual running costs in both the room and whole-home comparisons. Portable electric heating may still be practical when only one room needs heat for a short period.

Managing Heating During Power Outages

In its May 2026 winter outlook, the Australian Energy Market Operator forecast stable winter conditions for the National Electricity Market. More than 3,000MW of generation and battery-storage capacity had been added since the previous winter.

That system-level outlook does not eliminate local outages caused by storms, fallen trees, damaged poles or distribution-line faults.

Heat pumps stop during an outage unless connected to a suitable backup system. Many ducted or fan-assisted gas heaters also stop because their controls, ignition systems and fans require electricity.

Generator and Battery Safety

Portable petrol and diesel generators produce carbon monoxide and must operate outdoors in a ventilated area, away from windows and vents. They must never be used inside homes, garages or other enclosed spaces.

The NSW Government’s electrical-safety guidance also explains that:

• Portable generators must not be connected directly to household wiring.

• Appliances can be connected directly to a suitable generator.

• A home connection requires a compliant changeover switch installed by a licensed electrical contractor.

• Generators must be kept dry.

A battery power station avoids combustion exhaust at the point of use but still requires dry placement, unobstructed ventilation and careful load management.

It can operate compatible plug-in appliances directly. It does not automatically connect to a hardwired heat pump, ducted heating system or household switchboard.

BLUETTI Backup Solutions for Winter Heating

High-wattage heaters consume stored battery energy quickly. Runtime should be calculated from usable battery energy rather than theoretical capacity.

Use:

Estimated runtime ≈ battery capacity × usable-energy factor ÷ total connected load

The following estimates assume that 85% of stated battery capacity is available as usable AC energy after inverter losses and system consumption.

Backup Runtime Comparison

The estimates apply to the heater alone. A refrigerator, router, lights or other connected appliances will increase the total load and shorten runtime.

BLUETTI Elite 200 V2

The BLUETTI Elite 200 V2 provides 2,073.6Wh of capacity and 2,600W of rated AC output.

It can support compatible pure resistive loads of up to 3,900W in Power Lifting Mode. This is not ordinary 3,900W continuous output or a surge rating; its normal rated output remains 2,600W.

BLUETTI states that the Elite 200 V2 can recharge from 0% to 80% in approximately 1.1 hours under suitable AC charging conditions.

With an assumed 85% usable-energy factor, a continuous 1,200W plug-in heater has an estimated runtime of approximately 1.47 hours.

BLUETTI Elite 300

The BLUETTI Elite 300 provides 3,014.4Wh of capacity and 2,400W of rated AC output.

Its 10ms UPS switchover can help maintain compatible equipment, provided the total load remains within the unit’s limits and the connected equipment can tolerate the switchover time.

With an assumed 85% usable-energy factor, a continuous 1,200W heater has an estimated runtime of approximately 2.14 hours.

Cold-Weather Operating Limits

The Elite 200 V2 and Elite 300 share the following operating-temperature ranges:

• Charging: 0°C to 40°C

• Discharging: -20°C to 40°C

Cold conditions may reduce available battery performance. Do not charge either unit while its internal temperature is below 0°C.

Keep the power station:

• Dry and protected from rain and condensation.

• On a stable surface away from wet floors.

• Ventilated with its air openings unobstructed.

• Away from blankets, curtains and direct heat sources.

Allow condensation to evaporate before operating or charging a unit moved from a cold environment into a warm room.

Victoria’s 2027 Electrification Rules

Victoria’s electrification and efficiency regulations will be introduced in stages:

• From January 2027: New homes and many new commercial buildings must generally be built all-electric, including commercial kitchens. Exemptions apply.

• From 1 March 2027 for owner-occupiers: An irreparable gas hot-water appliance must generally be replaced with an electric alternative. Owner-occupiers are not required to replace gas space heating or gas cooktops.

• From 1 March 2027 for rental providers: When a hot-water or heating appliance cannot be repaired, it must generally be replaced with a heat-pump water heater or an efficient reverse-cycle air conditioner in the main living area.

Selecting the Right Heating and Backup Setup

A correctly sized reverse-cycle system is generally the strongest option for regular room or whole-home heating. It had the lowest annual running costs in Sustainability Victoria’s archived comparisons and can also cool the home during summer.

Portable electric heaters remain useful for short periods in one room because they cost less to purchase and require no fixed installation. Natural-gas heating may remain practical in homes with an existing serviceable system, but running costs, servicing and carbon-monoxide safety must be considered.

During an outage, a BLUETTI portable power station can provide temporary power to compatible plug-in appliances. It cannot automatically power hardwired heating, and high-wattage heaters will deplete the battery quickly.

FAQ

What is the most cost-effective heater to run in Australia?

In Sustainability Victoria’s archived 2025 Melbourne comparison, reverse-cycle air conditioning had the lowest annual running cost.

For a 30m² room:

• 3-star reverse-cycle system: $191

• 3-star natural-gas heater: $650

• Portable electric heater: $860

• 3-star LPG heater: $1,037

Actual costs depend on current tariffs, climate, insulation and operating time.

Which option produces fewer operational emissions?

In Sustainability Victoria’s archived model for a pre-2005, 160m² Melbourne home heated to 20°C:

• A 2-star ducted reverse-cycle system produced an estimated 19.8 tonnes of operational emissions over 10 years.

• A 3-star ducted-gas system produced an estimated 47.4 tonnes.

These figures cover projected operational emissions, not complete lifecycle emissions from manufacturing, installation and disposal.

Will a portable power station run a heater during an outage?

Yes, if it is a compatible plug-in heater and remains within the power station’s rated output.

Assuming 85% usable AC energy:

• Elite 200 V2 with a 1,200W heater: approximately 1.47 hours

• Elite 300 with a 1,200W heater: approximately 2.14 hours

Other connected devices will reduce these runtimes.

How should I select an electric heater for a small bedroom?

Choose a heater with:

• Suitable wattage for the room.

• A thermostat.

• Overheat protection.

• A tip-over switch where applicable.

• Adequate clearance from bedding, curtains and furniture.

A portable electric heater may suit occasional short-duration use. For regular or extended heating, a reverse-cycle system will generally cost less to operate.