As a rule, all oil-filled space heaters carry a maximum power rating of 1500 Watts (W), which is the staple norm for most portable heating devices.

Alternatively, use the calculator from

The power consumption of an oil-filled space heater depends on its power rating and the duration of use. Oil-filled space heaters typically have power ratings ranging from 600 watts to 1500 watts, with higher-rated models being able to produce more heat but consuming more electricity.

However, some space heater brands may carry models with a threshold energy rating of either 700W to 800WUse the below calculator to find the average power consumption of an oil-filled space heater of 750 Watts for 6 hours a day @ $0.12 per kWh. Also, know the running cost of the heater per hour, day, week, and year.

How Much Power Does Your Oil-Filled Space Heater Consume?

Now that you have the basic rundown of how your oil-filled space heater operates, you must determine the power consumed by your home’s heating device.

Sometimes, a tertiary setting might lie between these two designated figures.

Oil filled space heaters provide the flexibility that allow you to overcome this difficulty. They're designed to be moved from room to room and draw a relatively small amount of power, compared to the average furnace (400-1500 watts on average), so you can add heat strategically in order to optimize your environment .

Therefore, if you are on the hunt for an oil-filled space heater to be added to your living quarters, you should note the minimum and maximum power range your heater can consume.

The amount of power used by your oil-filled space heater is crucial in determining exactly how much money you will need to fork out over your heating bills much later.

You must also remember to factor in the additional cost of taxes and any extra fees that might be piled on top of your regular heating bill, which can vary from location to location on a global scale.

How Can You Determine the Amount of Energy Used by Your Oil-Filled Space Heater?

Before you head off and whip out your calculator to ascertain your future heating bill caused by your oil-filled space heater, you must first have a tight grasp on the universal principle of heater wattage.

Each electrical device that you own under your roof features two different wattage ratings by default.

The first rating caters to the power consumed by the device itself, while the second rating is related to the heating capacity of your unit.

This concept applies to your oil-filled space heater as well since it uses electricity to operate optimally.

The two wattage ratings can usually be located in the owner’s guidance manual or mini booklet that is given to you during the moment of purchase of your space heater or can be printed on either the back or the side of your device.

Either way, the rating is given usually confers to the power output and not the amount of power that is directly consumed by your oil-filled space heater.

For you to unearth the exact amount of power utilized by the space heater, you have now procured; you will need to steal a glance at the label stamped at the back or the bottom of your device.

Under normal circumstances, the electrical ratings will be printed very clearly on the label itself. These figures will be denoted in either Amperage (A), Voltage (V), or Watts (W).

Now that you have finally attained some substantial numbers to crunch, you can ascertain the heater wattage of your device by following the formula listed below:

Watts (W) = Volts (V) x Amps (A) x Power Factor.

Universally speaking, the Power Factor has been coined at an accepted standard of 1 unit.

However, there is a collection of electrical devices that do not fall within this rule.

Now that you have figured out the exact amount of Watts consumed by your oil-filled space heater, your next step would be to determine its overall efficiency.

You may use the formula depicted below to do so:
x 100 = %

The power input of your oil-filled space heater can be derived from the percentage (%) calculated from the formula above.

For example, a space heater usually runs from 120V to 240V, based on the model you have acquired and the manufacturing location of the device.

For this purpose, we will simply use an oil-filled space heater with a label of 120V and 12.5A. According to the equations listed above, this means your space heater has a power consumption of:

120V x 12.5A x 1 = 1500 Watts

You can further derive this value into kilowatts by merely dividing the amount of Watts by 1000:

How Much Does Your Oil-Filled Space Heater Cost to Operate?

Now that you have deduced the amount of power consumed by the oil-filled space heater in your house, you will need to ascertain the heater power rating next.

This will give you a rough idea of how much your heating bill will chalk up to when you set your space heater to work and allow you to plan your finances accordingly.

As mentioned, most oil-filled space heaters will run on either 120V or 240V, requiring almost similar energy levels to operate without a hitch.

This means your heating bills should not diverge too much from one another should you select a device that uses 120V or 240V to operate.

By heating bills, this directly confers to your electricity bills. No one likes to see a humongous spike in their electricity bills, especially during winter, when the cost of enveloping yourself in heavenly warmth often reaps a steep price.

But by figuring out how costly a 1.5kW oil-filled space heater might be, you can use the formula listed below:

No. of Watts used by the oil-filled space heater x No. Of hours the heater has been operating.

A quick example: You are now in your living room and want to watch your favorite movie on television in complete comfort.

But the room is chilly to the bone, and those two layers of sweaters are not doing much to buffet against the icy claws of the cold.

Instead of rubbing your hands up and down your arms repeatedly in a futile effort to stay warm, you decide to crank up the heat by turning on your oil-filled space heater for the next three hours. Sounds familiar?

Well, here is what those three hours of blessed heat are going to cost you:

1500W x 3 hours = 4500

Divide the number you have derived above by 1000 next:

= 4.5

Quickly look up the electrical utility charges designated to your local area or region, as determined by your local electrical department.

Note that these charges will vary in different locations, and each country has a different set of laws and subsequent tax inclusions added to your electricity bill.

Therefore, depending on the designated charges, using the same space heating device in a different region or area might cost you less or more.

Now, multiply that number you have just attained against the electrical utility charges established by law in your area.

The average nationwide electrical charge will cost approximately $0.17 in the United States.

By taking note of this assumption into account, your charges should be approximate:

4.5 x $0.17 = $0.765

This translates to $0.765 in heating bills for those three hours of much-coveted warmth you crave so desperately to enjoy to watch your weekend entertainment.

If you decide to utilize the same oil-filled space heater for three hours every day for a month in your home, then the total of your monthly heating bill would add up to roughly:

$0.765 x 30 days = $22.95

Do not forget! This is without including any additional hidden costs that your heating bills might be subject to, such as extra fees or taxes.

Thus, the longer you keep your oil-filled space heater turned on, the higher your electricity bill will be in the long run.

Types of Oil-Filled Heaters and Average Wattage Utilization

  1. Convection Heaters Convection heaters are the most common type of oil-filled heaters. They use convection currents to heat the air in the room, which rises and circulates to create warmth. The average wattage utilization of a convection heater ranges from 500 to 1500 watts, depending on the size and model.
  2. Radiant Heaters Radiant heaters use infrared radiation to heat objects and people in the room. They are ideal for heating small areas, such as bathrooms or bedrooms. The average wattage utilization of a radiant heater ranges from 400 to 1000 watts.
  3. Micathermic Heaters Micathermic heaters combine convection and radiant heating to provide fast and efficient warmth. They use a thin mica sheet to distribute heat evenly across the room. The average wattage utilization of a micathermic heater ranges from 800 to 1500 watts.
  4. Baseboard Heaters Baseboard heaters are installed along the room’s walls and use convection currents to heat the air. They are ideal for heating larger spaces and require professional installation. The average wattage utilization of a baseboard heater ranges from 500 to 2000 watts, depending on the length of the heater.
  5. Panel Heaters Panel heaters are flat and slim, making them ideal for small spaces. They use convection currents to heat the air and can be wall-mounted or freestanding. The average wattage utilization of a panel heater ranges from 400 to 1000 watts.

Popular Oil Heaters And Power Consumption

Type of HeaterModel NameWattage UtilizationVoltageAmperageEnergy Rating
RadiantDeLonghi EW7707CM1500 watts120V12.5AEnergy Star
RadiantPelonis NY1507-14A1500 watts120V12.5AETL Listed
RadiantHoneywell HZ-7891500 watts120V12.5AETL Listed
ConvectionDeLonghi TRD40615E1500 watts120V12.5AEnergy Star
ConvectionPelonis HO-0203D1500 watts120V12.5AETL Listed
ConvectionHoneywell HZ-7891500 watts120V12.5AETL Listed
Fan-forcedDeLonghi TCH8093ER1500-2400 watts120V12.5-20AEnergy Star
Fan-forcedPelonis NT20-12D1500-2500 watts120V12.5-20.8AETL Listed
Fan-forcedHoneywell HZ-7891500-2500 watts120V12.5-20.8AETL Listed

Understanding Electricity Usage of Oil-Filled Heaters

The electricity usage of an oil-filled heater depends on its wattage rating and the length of time it’s in use. For example, a 1500-watt oil-filled heater used for 8 hours will consume 12 kilowatt-hours (kWh) of electricity. If the electricity rate is 13 cents per kWh, running the heater for 8 hours will cost approximately $1.56.

To reduce electricity usage and costs, it’s essential to use the heater efficiently. Here are some tips:

  • Set the thermostat to a comfortable temperature and avoid overheating the room.
  • Turn off the heater when you leave the room or go to bed.
  • Use a timer to schedule the heater’s operation and avoid unnecessary usage.
  • Insulate the room to prevent heat loss and improve the heater’s efficiency.

Oil-filled heaters are an excellent choice for heating rooms, but it’s crucial to understand their power consumption and electricity usage to avoid unnecessary energy costs. By choosing the right oil-filled heater and using it efficiently, you can save money on your electricity bill and keep your room warm and comfortable.

Factors Affecting Power Consumption of Oil-Filled Heaters

Several factors can affect the power consumption of oil-filled heaters, including:

  • Room size: The larger the room, the more power the heater will consume to maintain a comfortable temperature.
  • Ambient temperature: If the temperature is shallow, the heater will consume more power to maintain the desired temperature.
  • Insulation of the room: A poorly insulated room will require more power to maintain a comfortable temperature.
  • Frequency of use: The more frequently the heater is used, the more power it will consume.

Tips for Reducing Power Consumption and Cost of Oil-Filled Heaters

There are several ways to reduce the power consumption and cost of oil-filled heaters, including:

  • Setting the thermostat to a lower temperature: Lowering the temperature by just a few degrees can significantly reduce power consumption and cost.
  • Using a timer to control the length of usage: Setting a timer for the heater can help avoid unnecessary usage and reduce power consumption.
  • Keeping the room well-insulated: Proper insulation can reduce the heat needed to maintain a comfortable temperature, reducing power consumption.

Frequently Asked Questions

  1. Do oil-filled heaters use a lot of electricity? Oil-filled heaters can use a lot of electricity, depending on their wattage and how frequently they are used.
  2. How much electricity does an oil heater use per hour? The electricity consumed by an oil heater uses per hour depends on its wattage. For example, a 1500-watt oil heater will use 1.5 kWh of electricity per hour.
  3. How much electricity does a 1500-watt oil heater use? A 1500-watt oil heater will use 1.5 kWh of electricity per hour.
  4. Are oil-filled space heaters cheaper to run? Oil-filled space heaters can be cheaper than other space heaters, as the oil retains heat for longer, reducing the need for continuous heating.
  5. Is it cheaper to leave an oil heater on all night? Leaving an oil heater on all night can be more expensive than turning it off when unnecessary. It’s best to use a timer to control the length of usage.
  6. How much does running a 1500-watt oil heater cost for 8 and 24 hours? Assuming an electricity rate of $0.15 per kWh, running a 1500-watt oil heater for 8 hours will cost $1.80, and running it for 24 hours will cost $5.40.
  7. What are the disadvantages of an oil heater? The disadvantages of oil heaters include slow heating time, being heavy and difficult to move, and requiring maintenance such as refilling the oil.
  8. Which type of oil heater is the cheapest to run? Radiant oil-filled heaters are typically the cheapest to run, consuming the least power.
  9. Are oil heaters better than electric ones? Oil-filled heaters are generally more efficient than electric heaters, as the oil retains heat for longer, reducing the need for continuous heating.
  10. Do Delonghi heaters use a lot of electricity? Delonghi heaters can use a lot of electricity, depending on their wattage and how frequently they are used.
  11. Are oil space heaters better? Oil space heaters can be better than other space heaters, as the oil retains heat for longer, reducing the need for continuous heating.
  12. Do oil-filled heaters need to be refilled? Oil-filled heaters do not typically need to be refilled, as the oil is sealed inside the heater.
  13. What is the advantage of an oil-filled space heater? The advantage of an oil-filled space heater is that the oil retains heat for longer, reducing the need for continuous heating.
  14. Can you sleep with the oil heater on? Sleeping with an oil heater on is not recommended, as it can be a fire hazard. It’s best to turn it off when not in use.
  15. Can the oil heater be used overnight? Oil heaters can be used overnight, but it’s best to use a timer to control the length of usage and turn them off when not needed.
  16. Are oil-filled heaters safe to leave unattended? It is not recommended to leave oil-filled heaters unattended, as they can be a fire hazard.
  17. How big of a room will 1500 watts oil heater can heat? A 1500-watt oil heater can typically heat a room to 150 square feet.
  18. Are DeLonghi oil-filled heaters safe? DeLonghi oil-filled heaters are generally safe to use, but following the manufacturer’s instructions and safety guidelines is essential.
  19. How many watts does a DeLonghi oil-filled heater use? The wattage of a DeLonghi oil-filled heater can vary, depending on the model. It’s essential to check the manufacturer’s specifications for each model.
  20. Where should an oil heater be placed in a room? Oil heaters should be placed on a flat, stable surface and away from flammable materials. They should also be positioned in a location that allows for proper air circulation.
  21. What is the best oil heater to buy? The best oil heater to buy depends on the specific needs and preferences of the buyer. Some popular brands include DeLonghi, Pelonis, and Honeywell.
  22. Which room oil heater is best? The best room oil heater depends on the size of the room and the desired level of warmth. Radiant oil heaters are best suited for small to medium-sized rooms, while convection and fan-forced oil heaters are better for larger spaces.
  23. How do you use an oil heater efficiently? To use an oil heater efficiently, it’s essential to set the thermostat to a lower temperature, use a timer to control the length of usage, and keep the room well-insulated.
  24. Will a 2500-watt oil heater heat a bedroom? A 2500-watt oil heater can heat a more oversized bedroom or a living room.
  25. Which is cheaper to run, a convector heater or an oil-filled radiator? Oil-filled radiators are generally cheaper to run than convector heaters, as they retain heat for longer, reducing the need for continuous heating. However, the cost of running each type of heater will depend on its specific wattage and usage.


Following the equations and steps outlined above, you can quickly determine the electricity your oil-filled space heater consumes.

Considering that this figure alters from region to region and might carry extra charges, your electricity bill also highly depends on how long you keep your space heater turned on.

Other factors that can contribute to the overall electrical cost include the time of the day you use your space and the time of the year your space heater is being used.

With that in mind, it is always highly encouraged that you reduce the usage of your oil-filled space heater to stave off the possibility of incurring a significant peak in your next electricity bill.

It does pay to be cautious and set aside the necessary finances for your heating bills. 

After all, you wouldn’t want to spend Christmas in the blistering cold of your living room now, would you?