Do Oil Heaters Use a Lot of Electricity? Winter Efficiency Guide for Aussie Homes
Do oil heaters use a lot of electricity? Many Australians worry about rising energy bills during winter. This article explains how much power oil-filled heaters actually use, what factors affect their running costs, and how they compare with other heating options, helping you understand whether they are truly expensive to run and how to use them more efficiently.
How Much Electricity Do Oil Heaters Use
Oil heaters commonly range from 500W to 2,400W, with 1,500W being a popular size for bedrooms, studies, and smaller living areas. The wattage shows the heater’s maximum power draw, while actual electricity use depends on the heat setting, room size, insulation, thermostat cycle, and runtime.
To calculate kWh usage, use this simple formula:
kWh = kW × hours
A 1,500W oil heater uses up to 1.5 kWh per hour when running at full power. Based on Australian electricity usage rates of about 24c to 45c per kWh, that works out to roughly 36c to 68c per hour.
Usage Scenario | Electricity Use | Estimated Cost |
1 hour | 1.5 kWh | $0.36 to $0.68 |
6 hours per day | 9 kWh | $2.16 to $4.05 |
30 days at 6 hours per day | 270 kWh | $64.80 to $121.50 |
Key Factors Driving Oil Column Heater Power Consumption in Australia
1. Heater Wattage and Room Fit
Wattage shows how much electricity the heater draws while the element runs. A higher wattage heater can warm a room faster, but the room size, layout, and heat loss affect actual power use:
Small rooms around 10–15 m²: A 1000W to 1500W heater may suit bedrooms, studies, or small home offices.
Larger enclosed rooms around 20–30 m²: A 2000W to 2400W unit may suit living rooms, depending on insulation and window size.
Open plan areas and high ceilings: More air volume makes the heater run longer.
2. Heater Types and Energy Patterns
Different heaters use electricity in different ways. Oil column heaters work best for steady warmth in enclosed rooms, rather than fast heating across large open areas.
Heater Type | Best For | Energy Pattern |
Oil Column Heater | Bedrooms and quiet rooms | Slow heat up; steady warmth after the element cycles off. |
Panel Heater | Insulated rooms | Gentle background warmth; depends heavily on insulation. |
Fan or Ceramic Heater | Quick spot heating | Heats fast, but warmth drops quickly after shutdown. |
Radiant or Infrared Heater | One person or one area | Warms people and surfaces instead of the whole room. |
Reverse Cycle AC | Larger rooms and longer heating periods | Moves heat rather than generating it directly, so it usually uses less electricity. |
If you are comparing the cheapest way to heat a house, the right answer depends on room size, runtime, insulation, and how many people need heating. Oil column heaters can suit small to medium enclosed rooms where quiet, steady warmth matters. For larger spaces or long heating periods, a reverse cycle air conditioner often uses less electricity because it moves heat rather than generating it directly.
3. Room Layout and Heat Loss
Room design affects how long the heater needs to run. Even a suitable oil column heater can use more power if the room loses heat quickly. Common factors include:
Bare tiles, timber floors, or uninsulated floors make the room feel cooler.
Large windows without heavy curtains or close-fitting blinds.
Open hallways, stairwells, laundries, or kitchens.
Draughts around doors and windows.
4. Insulation and Australian Climate Zones
Heating needs vary across Australia. Cooler regions usually need longer heater runtime than warmer coastal or northern areas.
Cooler regions: Tasmania, the ACT, much of Victoria, alpine areas, inland NSW, and cooler parts of South Australia often need more winter heating.
Warmer regions: Queensland, northern WA, the NT, and warmer coastal areas may only need oil column heaters occasionally.
5. Thermostat Settings and Power Draw
The thermostat controls how often the heating element turns on and off. Once the room reaches the selected temperature, the heated oil continues releasing warmth even when the element stops drawing power.
Recommended setting: Around 18°C to 20°C for winter heating.
Cost impact: Each degree above 20°C can increase heating energy use by around 5% to 10%.
6. Runtime and Australian Electricity Tariffs
Runtime is one of the main factors behind oil heater running costs. The longer the heater runs, the more kilowatt hours it uses, so the cost of electricity per kWh becomes more important during longer heating sessions.
Flat rate tariffs: The same usage rate applies throughout the day, making heater costs easier to estimate.
Time of use tariffs: Rates change across peak, shoulder, and off-peak periods, so evening heating may cost more on some plans.
Cost Estimation Example: A 2000W oil column heater uses around 2kWh if it runs at full output for one hour. To estimate the cost, multiply 2kWh by the electricity rate shown on your bill.
Tips to Maximise Efficiency and Reduce Electricity Costs
Plan Heating Around Peak and Off-Peak Rates
If you are on a time-of-use electricity plan, the time you run your heater can affect your winter energy costs. Peak rates usually apply when electricity demand is higher, often on weekday evenings, while off-peak rates are usually cheaper and may apply overnight or on weekends. Exact times vary by retailer, location, meter type, and energy plan, so check your electricity bill or retailer app before setting heating routines.
A few practical steps can help:
Warm the room before the evening peak period
Use the thermostat once the room feels comfortable
Avoid running high-wattage heaters through long peak periods
Shift low-priority appliance use to off-peak times
A portable power station can also support this approach by giving households more flexibility during expensive peak windows and winter outages.
For smaller setups, the EcoFlow DELTA 3 Plus Portable Power Station is a practical choice for winter comfort and everyday resilience. Its expandable capacity gives households more flexibility for short outages, while the strong AC output can support essential devices and low-power heaters. Fast recharging and multiple charging options also make it easier to restore power between uses, whether you are preparing for a cold evening, managing peak pricing periods, or keeping basic routines running during a blackout.
For larger homes or longer backup needs, the EcoFlow DELTA Pro Ultra Whole-home Backup Battery offers stronger support. It can help run high-demand household items, including central air conditioning, selected heating needs, kitchen appliances, lighting, the internet, and everyday devices for days when grid power goes down. By pairing it with the EcoFlow Transfer Switch, you can seamlessly integrate it as a whole-home backup power source.
Choose the Right Heater Size
Match the heater to the room you actually use most. A smaller enclosed bedroom may only need a 1000W to 1500W model, while a larger living room may need a higher wattage unit. Avoid using a small heater in an open plan space, as it may run constantly without making the area comfortable.
Use the Thermostat Effectively
Most oil heaters are equipped with thermostats that automatically turn the heating element on and off. Setting a stable, comfortable temperature (rather than constantly adjusting it) allows the heater to cycle efficiently and reduces unnecessary power consumption.
Improve Insulation and Reduce Heat Loss
Good insulation is one of the most effective ways to reduce electricity use. Sealing gaps around windows and doors, using thick curtains, and closing unused rooms can help retain heat for longer, meaning the heater runs less often.
Use Timers and Avoid Unnecessary Runtime
Select a heater model featuring an integrated 24-hour timer.
Program the unit to switch on 30 minutes before you wake up and shut off automatically after bedtime to avoid paying for unnecessary heating.
Heat Only Occupied Spaces (Zoning)
Instead of heating the whole house, focus on one or two frequently used rooms. Oil heaters are particularly effective for zoned heating because they maintain warmth even after cycling off.
Maintain Stable Indoor Temperatures
Avoid overheating the room, and use the timer or thermostat to warm the space only when needed. For rooms you are not using, turning the heater off usually saves more energy than maintaining warmth all day.
Combine Heating Strategies when Possible
In some cases, pairing an oil heater with other low-energy solutions such as electric blankets or warm clothing can reduce the need for continuous heating, further lowering electricity usage.
Conclusion
So, do oil heaters use a lot of electricity? The answer depends on how they are used. While their wattage can look high, oil heaters often run more efficiently than expected thanks to thermostat cycling and heat retention.
For most Australian households, they offer a balanced option for steady, quiet winter heating when used correctly and in well-insulated spaces.
FAQs
Is it cheaper to run an electric heater or an oil heater?
Oil heaters can feel more cost-effective for steady heating in small to medium enclosed rooms because they retain warmth and cycle on and off once the room reaches the set temperature. However, they are not always cheaper than other electric heaters in every situation. For larger spaces or long heating periods, a reverse cycle air conditioner usually offers better energy efficiency.
Is it cheaper to leave an oil heater on all the time?
No. It is almost always more efficient to heat the space only when you need it. The retained heat in the oil will keep the room warm for a while after it switches off, so use the thermostat to maintain a temperature and the timer to have it come on when needed.
What are the disadvantages of oil heaters?
Slow Warm-Up: They require 10 to 30 minutes to heat a room, which makes them unsuitable for quick bursts of warmth.
Weight and Bulk: Their heavy metal design makes them harder to transport between rooms than compact fan heaters.
Surface Temperature: The exterior fins become hot to the touch, creating a burn risk for curious children and pets.
Limited Range: They struggle to distribute heat evenly across large, open-plan living areas or rooms with high ceilings.
Higher Operational Costs: While efficient for a portable electric option, they still cost more to run than high-efficiency reverse cycle air conditioners.