Electric Heater Types Compared: Which Is the Most Efficient for Australian Homes?

The Different Types of Heaters Available in Australia

Choosing the wrong heater for your home can quietly drain hundreds of dollars over a single Australian winter. With electricity prices sitting around 30 to 35 cents per kWh across most of the country, the gap in running costs between different types of heaters is significant enough to matter. This article compares the main types of heaters available to Australian households, covering electric resistance heaters, gas heaters and reverse cycle air conditioning systems, with a focus on efficiency and what each option actually costs to run day to day rather than just what you pay at the checkout.

Electric Resistance Heaters: Convenient but Costly to Run

Electric resistance heaters are the most common type found in Australian homes, and for good reason: they are affordable to buy, require no installation and are available everywhere from hardware stores to supermarkets. Every electric resistance heater, regardless of its style, converts 1kW of electricity into exactly 1kW of heat. That means a 100% efficiency rating across the board, and the type of heater you choose makes very little difference to your running costs. What actually drives your bill is the wattage of the unit and how many hours a day you run it. At 32 cents per kWh, a 2kW panel heater running six hours a day costs around $1.92 per day, or roughly $58 per month. Run it all winter and that adds up fast.

These heaters are best suited to small rooms, short bursts of heating, or renters who cannot install a fixed system. For whole-home heating over a long winter, the running costs of electric resistance heaters are hard to justify compared to reverse cycle alternatives.

Heater Type	Typical Wattage	Best For	Noise Level	Upfront Cost Range
Panel Heater	500W to 2,400W	Bedrooms, living areas	Silent	$50 to $300
Convection Heater	1,000W to 2,400W	Medium rooms, sustained heating	Silent to low	$60 to $250
Fan Heater	1,200W to 2,400W	Quick warm-up, small spaces	Moderate	$30 to $150
Radiant / Infrared Heater	800W to 2,000W	Spot heating, outdoors, garages	Silent	$40 to $400
Oil-Filled Column Heater	1,000W to 2,400W	Bedrooms, overnight heating	Silent	$80 to $350

Panel Heaters and Convection Heaters

Panel heaters and convection heaters work by warming the air around them, which then rises and circulates naturally through the room. They are among the most popular electric heater styles in Australia because they are slim, quiet and can be wall-mounted to save floor space. Most models include a built-in thermostat, so they cycle on and off to maintain your target temperature rather than running flat out the whole time.

Wattage typically ranges from 500W up to 2,400W, giving you flexibility to match the heater to the room size. A 1,000W panel heater is usually enough for a small bedroom, while a 2,400W model suits a medium-sized living area. Because they produce no fan noise, panel and convection heaters are a solid choice for bedrooms and study spaces where quiet operation matters. The trade-off is that they take a little time to warm a cold room compared to a fan heater.

Radiant and Infrared Heaters

Radiant and infrared heaters work differently from convection-style units. Rather than warming the air, they emit infrared radiation that heats people, furniture and surfaces directly. The practical result is that you feel warm almost instantly, even in a draughty space where heated air would simply escape.

This makes radiant heaters particularly effective for alfresco areas, garages, workshops and other semi-outdoor spaces where conventional heaters struggle. The downside is that they do not heat the whole room evenly. If you step out of the beam, the warmth drops off quickly. For spot heating a specific person or area, they are hard to beat. For heating an entire living room, they fall short. Wattage typically runs from 800W to 2,000W, and most models are silent in operation.

Oil-Filled Column Heaters

Oil-filled column heaters use an electric element to heat oil sealed inside the unit, which then radiates warmth steadily into the room. The key advantage is thermal mass. The oil retains heat after the element switches off, so the heater keeps warming the room without drawing power continuously. This makes them more economical than fan heaters for sustained heating sessions of several hours.

They are completely silent, have no exposed heating element and are considered one of the safer portable heater options for overnight use in bedrooms. The main drawback is that they are slow to reach operating temperature, so they are not the right choice if you need a room warm in a hurry. They are also heavier and bulkier than panel heaters, which limits portability despite the castors most models include.

Gas Heaters: High Heat Output, but Check the Safety Fine Print

Gas heaters come in two distinct types: flued and unflued. Flued gas heaters are permanently installed and pipe combustion gases outside through a wall or roof vent, making them the safer choice for main living areas where the heater runs for extended periods. Unflued gas heaters are portable and vent nothing outside, which means every byproduct of combustion, including water vapour, nitrogen dioxide and carbon monoxide, goes directly into the room you are trying to heat. For a detailed breakdown of the risks involved with each type, the gas wall heater safety guide covers what Australian homeowners need to know.

The indoor air quality concern with unflued gas heaters is real and worth taking seriously. A single unflued heater running for a few hours can raise indoor humidity noticeably and push nitrogen dioxide levels above recommended thresholds, particularly in smaller or poorly ventilated rooms. Households with young children, elderly occupants or anyone with asthma or respiratory conditions should be especially cautious. If you do use an unflued gas heater, ventilation is not optional.

On running costs, gas heaters have historically been competitive in states where natural gas is cheap. That advantage has narrowed considerably. Residential gas prices across Australia have risen sharply over the past several years, and in many parts of the country a reverse cycle air conditioner now costs less to run per unit of heat delivered, even accounting for electricity prices. Gas heaters also have a fundamental limitation that is easy to overlook. They only heat. There is no cooling mode for summer, so you are paying for a single-season appliance rather than a year-round system.

Gas Heater Type	Venting	Indoor Air Quality Impact	Best Suited To	Heating Only?
Flued Gas Heater	Combustion gases vented outside	Minimal	Larger living areas, permanent installation	Yes
Unflued Gas Heater (portable)	No external venting	Raises humidity and NOx levels indoors	Short-term supplementary heating with ventilation	Yes

Reverse Cycle Split Systems: The Most Efficient Types of Heaters for Most Homes

A reverse cycle air conditioner is the most efficient electric heating option available to Australian homeowners, and it is not particularly close. Rather than generating heat by burning fuel or running electricity through a resistance element, a reverse cycle split system moves heat that already exists in the outside air into your home. This process, known as a heat pump cycle, allows the system to deliver three to five kilowatts of heating for every one kilowatt of electricity it consumes, giving it a coefficient of performance (COP) of 3 to 5. Compare that to any electric resistance heater, which has a COP of exactly 1, or a gas heater, which loses a portion of its energy through combustion inefficiency. Browse our full range of split system air conditioners to see current models and pricing across all major brands.

The efficiency advantage translates directly into lower running costs. A reverse cycle system delivering 2kW of heating to a bedroom might draw only 500W to 700W of electricity to do it, compared to a 2kW panel heater drawing the full 2,000W. Over a winter of daily use, that difference adds up to hundreds of dollars. And because the same unit cools in summer, you are spreading the upfront cost across 12 months of use rather than just the cooler months.

Modern inverter-driven split systems have also addressed the old concern about cold-climate performance. Most current models from Daikin, Mitsubishi Electric and Fujitsu maintain effective heating output down to around -15°C outside, which covers the coldest nights in alpine Victoria, the ACT and Tasmania without issue. If you are in a genuinely cold climate, check the manufacturer's heating capacity spec at low ambient temperatures rather than just the rated capacity at the standard 7°C test condition.

How a Heat Pump Actually Works

A reverse cycle split system uses the same refrigeration cycle as your fridge, just running in the opposite direction. The outdoor unit contains a refrigerant that absorbs heat from the outside air, even when that air feels cold to you. Cold air still contains significant heat energy, and the refrigerant is cold enough to absorb it. For a full technical explanation of the refrigeration cycle and how it applies to air conditioning, the how air conditioning works guide covers it in plain English.

Once the refrigerant has absorbed that heat, a compressor raises its pressure and temperature significantly. The now-hot refrigerant travels to the indoor unit, where it releases that heat into your room through the indoor coil. The refrigerant then expands, cools back down and returns to the outdoor unit to repeat the cycle.

The key insight is that the system is not creating heat from scratch. It is acting as a heat transport mechanism, moving energy from outside to inside. That is why it can deliver far more heat energy than the electrical energy it consumes.

What to Look for When Choosing a Split System for Heating

Picking the right split system for heating comes down to five practical factors. Get these right and the unit will perform well for 10 to 15 years.

1. Heating capacity matched to room size. As a rough guide, you need around 100W to 150W of heating capacity per square metre in a well-insulated room, rising to 160W to 200W in poorly insulated or high-ceiling spaces. A 2.5kW unit suits a bedroom or small study; a 3.5kW unit handles a medium living area; an 8.5kW unit is appropriate for a large open-plan space.
2. Star ratings in heating mode. The energy star label shows separate ratings for cooling and heating. Always check the heating star rating specifically, as some models are optimised for cooling and score lower in heating mode. More stars means lower running costs over the life of the unit.
3. Cold-climate performance specs. If your winters regularly drop below 5°C, look for the manufacturer's stated heating capacity at 2°C or lower ambient temperature. Some budget models lose significant output in cold conditions.
4. Inverter technology. All three products mentioned here use inverter compressors, which vary their speed to match the heating load rather than cycling on and off at full power. This reduces energy consumption at part-load, which is most of the time, and keeps the room temperature more stable.
5. Indoor unit noise level. For bedrooms, look for an indoor unit rated at 19 to 22 dB(A) on its lowest fan speed. This is quiet enough to sleep through comfortably.

At the entry level, the Mitsubishi Electric 2.5kW Split System Air Conditioner MSZAP25VGKD (from $1,122) is a solid starting point for bedrooms and smaller rooms, with a reputation for quiet operation and reliable cold-weather performance. Stepping up in capacity, the Fujitsu 3.5kW Lifestyle Range Inverter Split System ASTG12KMTC (from $1,221) is a popular mid-range pick that suits medium living areas and delivers strong heating output relative to its price. For larger open-plan spaces, the Daikin 8.5kW XL Premium Inverter Split System Air Conditioner FTXM85WVMA (from $2,982) provides the output needed to heat a big room quickly and maintain temperature efficiently, with Daikin's inverter technology keeping running costs in check even at high capacity.

Which Heater Type Is Right for Your Situation?

The best heater for your home depends on your living situation, budget and how often you actually need heating. A renter in a small apartment has very different needs from a homeowner trying to heat a large open-plan living area through a cold Canberra winter. The table below matches common situations to the most practical heater type.

Situation	Best Heater Type	Why
Renting a small apartment	Panel heater or oil-filled column heater	No installation required, affordable upfront, easy to move out with
Owner-occupier wanting year-round comfort	Reverse cycle split system	Heats in winter, cools in summer, lowest running cost per kW of heat delivered
Outdoor entertaining area	Radiant or infrared heater	Heats people directly rather than the air, works effectively in open or draughty spaces
Existing gas connection and large home	Flued gas heater	High heat output, combustion gases vented safely outside, suits large living areas
Budget-conscious buyer needing occasional heating	Fan heater	Lowest upfront cost, heats a small space quickly, fine for short infrequent use

For most Australian homeowners, a reverse cycle split system delivers the best long-term value by a clear margin. The upfront cost is higher than any portable electric heater, but the running cost advantage compounds every year. A system that costs $1,100 to $3,000 installed pays for itself relatively quickly against the alternative of running a 2kW resistance heater through a full winter, and it doubles as your air conditioner through summer. If you are in a position to install one, it is the option worth prioritising. For a broader look at how these options stack up across different home types, see our guide to best home heating options for Australian homes.

FAQ: Types of Heaters

What is the most energy-efficient type of heater?

A reverse cycle split system (heat pump) is the most energy-efficient heater available for Australian homes. It delivers three to five kilowatts of heat for every one kilowatt of electricity consumed, giving it a coefficient of performance of 3 to 5. No electric resistance heater or gas heater can match that ratio.

What type of heater is cheapest to run?

Reverse cycle split systems are the cheapest to run for regular or whole-home heating. Among portable electric heaters, oil-filled column heaters are generally more economical than fan heaters for sustained use because their thermal mass reduces how often the element needs to cycle on. Fan heaters are cheap to buy but expensive to run if used for more than short periods.

Are gas heaters cheaper to run than electric heaters?

Gas heaters were cheaper to run than electric resistance heaters in most Australian states for many years, but that gap has narrowed significantly as residential gas prices have risen. A reverse cycle split system now costs less to run per unit of heat delivered than a gas heater in most parts of Australia, even with current electricity prices factored in.

What type of heater is best for a small room?

A panel heater or oil-filled column heater suits most small rooms well. For a bedroom or study up to around 15 square metres, a 1,000W to 1,500W panel heater is usually sufficient and runs quietly enough not to disturb sleep or concentration. A small reverse cycle split system is the better long-term investment if installation is an option.

Ready to Upgrade Your Home Heating?

Electric resistance heaters are convenient and cheap to buy, but their running costs make them a poor choice for anything beyond occasional or supplementary heating. Gas heaters offer high heat output, though rising gas prices and indoor air quality concerns have eroded much of their appeal. For most Australian homeowners, a reverse cycle split system is the clear winner. It delivers three to five times more heat per kilowatt of electricity than any resistance heater, cools in summer and pays back its upfront cost over time through lower energy bills.

If you are ready to make the switch, browse the full range of split system air conditioners at Oz Air Online to compare models and pricing across Daikin, Mitsubishi Electric, Fujitsu and more. There is a unit to suit every room size and budget, from compact bedroom systems through to high-capacity units for large open-plan living areas.