11 Best Oil Filled Space Heaters for 2021 – (Reviews and Buying Guide)

Best Oil Filled Space Heaters

If you want to buy an oil filled space heater then for sure you want to know what the best oil filled space heaters are on the market today. But to choose which one will suit best for your family at home usually is not an easy job.

The oil-filled space heaters are known as energy-efficient and safety devices. They are always a good choice if you need to add an additional heating in your room, you can use them for zone heating or you can even replace the whole existing home heating with the oil-filled space heaters. So, you can better manage the usage of electricity and your bills during winter.

Before you make a purchase oil-filled heater is really important to know what are the advantages and disadvantages of this type of space heaters. It is good to take a few minutes and read our buying guide to get more familiarized about oil-filled heaters. But, first of all, you can check our best choices of oil-filled space heaters.

These Are The Best Oil-Filled Space Heaters for Your Home

1. PELONIS NY1507-14A Oil-Filled Space Heater


Company: Pelonis

Price: $$

Our Rating: 9.1/10


Overview: Here we have an oil-filled space heater coming from the well known and renowned Pelonis brand, the PELONIS NY1507-14A. This is one of those heaters that offer versatility and quiet operation. The dimensions of this Pelonis heater are 13.8 inches deep, 11 inches wide and 25.2 inches high and it weighs 16.09 pounds (about 7.3 Kg). It is ideal for use in small and medium-sized rooms, bedrooms and offices.

In addition to its stunning design, this product, like most oil-filled heaters, features several safety features, allows you to optimize temperature easily and also comes with an automatic temperature regulator.


Product Features

This heater enables operation in three heating modes: 600 watts in low mode, 900 watts in medium mode and 1500 watts in high mode. In addition, it provides you with greater temperature control, where you can choose from one of the 5 temperature settings offered such as 65, 70, 75, 80, and 85 Fahrenheit.

To improve its portability, it comes with 4 wheels that can be easily mounted so you can easily move the heater to any location in your home.

It also comes with a remote control that offers a few basic options such as turning on and off the heater, raising and lowering the temperature, setting the timer and using the heat setting. I need to mention that the heater has a built-in LCD that is displaying the information needed for its current operation.

What We Like


  • Remote control
  • LCD Screen
  • Eco-mode for better efficiency
  • 4 wheels for better portability
  • While operates it doesn’t make a lot of noise
  • Tip-Over Safety Switch

What We Don’t Like


  • There is not a fan to drive the air around the room
  • The heater is not designed for large spaces

2. COSTWAY 22913-Cype Oil Filled Radiator Heater

Company: COSTWAY

Price: $

Our Rating: 9/10


Overview: If you are in need of an oil-filled radiator space heater that is capable of quickly heating up small and medium spaces then we can recommend a model coming from another very famous brand and that is the Costway brand with its model Costway 22913-CYPE Oil Filled Radiator Heater.

This product is very small compared to other models of this type; it is 9.5 inches long, 14 inches wide and 25 inches high. This heater weighs only 19.3 pounds (about 8.75 Kg) and it has great portability thanks to 4 universal wheels and a well-designed carry handle. This Costway 22913-CYPE Oil Filled Radiator Heater, as I mentioned earlier, is specifically designed to heat small and medium-sized rooms such as children’s rooms, bedrooms, and offices.

Typically like most models of this type, this heater offers three different heating settings such as low setting working at 600 watts, medium setting at 900 watts and high setting working at 1500 watts plus you have an additional mode and that is Energy saving mode which is a big plus for this model. Switching to any of these heating modes can be manually regulated by the mechanical selector located on the front of the heater.

The heater does not use a fan which means it does not produce any noise while in use, making it an ideal choice for the bedroom. For your safety, this heater incorporates all the necessary safety features such as Overheating Protection that is preventing the heater from overheating as well as the Tip-Over feature which automatically turns off the device if it is moved or if someone accidentally pushes him to the floor.

What We Like


  • Its portable design
  • Its capability of rapidly heating
  • The integrated safety features
  • It is a budget-friendly space heater
  • Energy-saving mode

What We Don’t Like


  • The remote control doesn’t come with this product

3. DeLonghi EW7707CM Oil-Filled Space Heater

Company: DeLonghi

Price: $$

Our Rating: 9/10


Overview: Here we have one of the best oil-filled space heaters from the DeLonghi brand and that is the model DeLonghi EW7707CM. This model is powerful enough to heat not only small and medium-sized rooms but you can also freely use it to heat large rooms in your home.

First of all, this heater has a great design that will fit perfectly into the ambiance of your home. It has 7 permanently sealed thermal slots that are filled with diathermic oil. The positive thing about these thermal slots is that they are designed to maintain a low surface temperature that is safe to the touch and at the same time the thermal slots allow for more efficient delivery of heat to the room. The heater has built-in wheels for better movement to a specific location in your room.

This product has a maximum heating power of 1500 watts with three different heating setting settings such as the low setting of 700 watts, a medium setting of 800 watts and a high of a maximum of 1500 watts.

In addition, the DeLonghi EW7707CM comes with COMFORT TEMP TECHNOLOGY which will allow you to maintain the required temperature in your room depending on your needs. What’s more, this technology allows you to set the heater in eco mode to maintain a constant room temperature between 68 and 70 Fahrenheit (between 20 and 21.1 Celsius).

Besides that, this product has an anti-freeze feature that will not allow the room temperature to fall down below 44 Fahrenheit (about 6.6 Celsius). This is very useful for protecting electrical appliances from freezing.

Also, for those who do not like noise, this Delonghi EW7707CM will be the right choice as it belongs to the group of quietest space heaters.

What We Like


  • It has a feature for automatic turn on and off.
  • It comes with pre-assembled snap-in wheels that increase its portability.
  • The heater has a power cord 6 feet long and storage section for the power cord.
  • It is a really quiet space heater, perfect for a bedroom.

What We Don’t Like


  • The heater doesn’t feature a timer.

4. NewAir AH-450B Electric Oil-Filled Radiator Space Heater

Company: NewAir

Price: $$

Our Rating: 9.1/10


Overview: Now, also we have a quality product that is coming from another very famous brand that manufactures quality home appliances and that is the NewAir brand with its model NewAir AH-450B Electric Oil-Filled Radiator Space Heater. This heater is specifically designed for heating small rooms such as bedrooms, children’s rooms, small offices and also it is a great choice for students living in student dorms.

One of the positive features of the NewAir AH-450B is that it has great portability. This is because this heater is lightweight which weighs only 19.2 pounds (about 8.7 kg) and has compact dimensions of 13.5×9.5×25. Plus this heater comes complete with four easy-roll casters and a well-designed lifting handle. Whenever you want to move this heater to the desired location you will do so with great ease.

As with most oil-filled heaters, the heating power of this heater is 1500 watts and can successfully heat rooms up to 150 square feet. There are three heating options available such as high, low and eco mode. The heater offers 5 different temperature settings starting at 65, 70, 75, 80 and 85 degrees Fahrenheit.

The device also has a timer of up to a maximum of 10 hours, and the great advantage of this heater compared to other heaters of this type is that you can set it not only to turn off after a certain time of heating, but you can also set the heater when to turn on the heating process.

Another positive thing is that it comes with a remote control so that controlling the operation of the heater is quite easy. To your satisfaction, the heater does not use a fan so it is very quiet when operating. The NewAir AH-450B has safety features like tip-over and overheating protection. But, the big drawback is that this heater doesn’t have the anti-freeze feature.

What We Like


  • It is a lightweight device
  • The great portability
  • Easy to use
  • The turn-on timer
  • The heater comes with a remote that will make it easier to use the heater
  • It works silently
  • Cord wrap place

What We Don’t Like


  • The heater can be only used for small rooms
  • There is no anti-freeze feature

5. DeLonghi TRD40615E Oil-Filled Heater

Company: DeLonghi

Price: $$$

Our Rating: 9.3/10


Overview: Here on our list, we have another premium oil-filled heater from the brand DeLonghi, and that is the model the DeLonghi TRD40615E. The maximum heating power of this heater is 1500 watts and is capable of producing both radial and convective heat. This heater is capable of effectively heating all types of rooms from small to large.

Also, for its high heating capabilities, it is very responsible the new specific design of the panels that have about 25% larger radial surface area. In addition, the heater at the top has thermal chimneys that contribute to better delivery of heat to your room. A positive feature of this heater is that the panels are permanently sealed and filled with high-quality Dragon 4. The body of this heater is made of very solid material, is rust-resistant and can be easily maintained.

At the highest operating mode, the surface temperature of this heater remains low, making it safe to touch. This is very important if you have children or pets, they will not burn if they accidentally touch the heater. A very effective feature of this oil-filled heater is the ECO mode, which is responsible for keeping your chosen room temperature constant and at the same time reducing energy consumption.

In order not to accidentally overheat the device if it has been operating at maximum operating mode for a long time, it has a safety feature built-in to prevent it. Otherwise, this device does not use a fan and is therefore very quiet when in use which is also a great advantage of this heater. Dimensions of this DeLonghi TRD40615E are 16.4 inches in length, 10.3 inches width and 26.1 inches high with its main weight of 26.6 pounds (about 12 Kg).

What We Like


  • Its silent operation.
  • The smart snap wheels increase the portability of this product.
  • It requires low maintenance
  • ECO mode
  • Safety features
  • The heater can be used for large rooms as well

What We Don’t Like


  • It is a little bit expensive
  • It doesn’t have a remote control

6. DeLonghi TRRS0715E Radia Oil-Filled Radiator Space Heater

Company: DeLonghi

Price: $$$

Our Rating: 8.7/10


Overview: If you are looking for an efficient and quiet oil-filled heater to meet your needs or support your home heating system during the winter days, then the DeLonghi TRRS0715E Radial Oil Heater should be one of the main heaters to buy.

The basic dimensions of this heater are 14x6x25 and its weight is 25 pounds. Along with this heater, you will also get wheels that can be easily mounted to move the heater to any location in your home.

Thermal slots are oil-filled and permanently sealed which is characteristic of this type of space heaters. They are designed to allow maximum heat flow into the room and the temperature of their outer surface is always low.

This heater can operate in three different levels of power such as minimum, medium and maximum. The maximum heating power of this heater is 1500 watts, which is equivalent to 5120 BTU heat, which is sufficient to successfully heat the premises at 250 square feet. This tells you that this DeLonghi TRRS0715E is intended for medium and large room heating.

As with most DeLonghi brand heaters, the ECO mode is built into this model. By selecting the ECO mode, the heat and power settings are automatically adjusted to maintain the optimum room temperature with less electricity use.

In addition, this DeLonghi TRRS0715E comes with safety features such as a thermal cutoff feature that prevents this device from overheating and an anti-freeze feature that prevents pipes from freezing in a room where it is installed.

What We Like


  • The heater features with a 24-hour programmable timer.
  • The adjustable thermostat.
  • The Eco Mode.
  • It is an energy-efficient device.
  • It comes with wheels, so you can easily move it to your preferred location.
  • The design.

What We Don’t Like


  • The remote control is not included with this model.

7. COSTWAY Oil Filled Radiator Heater

Company: Costway

Price: $

Our Rating: 9/10


Overview: This is a COSTWAY Oil Filled Radiator Heater which is another quality product from this company. It is a model that is very portable and at a very affordable price.

This heater can be found in two different variants of heating power, from the 700-watt model and the 1500 watt model. This is a 700-watt space heater. This heater comes in white and has a nice and modern design with compact dimensions of 5.5 inches long, 12 inches wide and 14 inches high its weight is just 8.9 pounds (about 3.9 kg).

A major disadvantage of this heater is that there are no wheels that many will not like. However the heater is very lightweight, it has a handle built-in, so it won’t be a problem to move it anywhere you need it in your home.

Obviously, this model is intended for small rooms and its ideal for students in dorms, small offices as well as RV owners. This COSTWAY Oil Filled Radiator Heater is capable of quickly heating small rooms.

When it comes to safety, this model also has built-in overheat protection and tip-over feature that will automatically turn off the device if accidental overturning occurs. Despite these safety features, you should be aware that when this heater is in use for a long time, the surface of its panels becomes very hot. Avoid touching the hot surfaces of the heater, especially you need to be careful if you have children or pets at home. Don’t let them come close to the heater.

What We Like


  • The compact size and lightweight.
  • The ability quickly to heat up small rooms.
  • The overheating protection and tip-over features.
  • Adjustable thermostat.
  • The Price

What We Don’t Like


  • It is not intended for medium to large rooms.
  • The heater does not have wheels.
  • There is no ECO mode.

8. Tangkula Electric Oil-Filled Space Heater

Company: Tangkula

Price: $$

Our Rating: 9.1/10


Overview: If you need an oil-filled space heater as an alternative heat source that has the ability to quickly and effectively heat the rooms in your home, whether your rooms are large or small, I suggest you consider the Tangkula Electric Oil Heater space heater model. It features a simple and unique design that creates hotter air and allows heat to be deployed faster in your room.


Product Features

Otherwise, its dimensions are 14 inches in length, 5.7 inches in width and 23 inches in height. It weighs 20 pounds (about 9 kg) which shouldn’t worry you because this Tangkula Electric Oil Heater has 4 wheels that make it easy to transport the heater from one room to another. Besides the wheels, this heater has a carry handle that will make it even easier to move the heater to anywhere in your home.

Its control panel is user-friendly allowing you to easily and efficiently use the heater. There is a built-in adjustable thermostat for more flexible adjustment of the desired temperature in the room and also regulating the usage of electricity. You have 3 different heat settings available, 600 Watts, 900 Watts and 1500 Watts which is the maximum heating power of this Tangkula Electric Oil Heater.

The heater with its permanently sealed oil-filled slots effectively and quietly transmits heat into the room so that the heater is ideal for use in a bedroom where you need complete silence while you sleep.

Plus this heater is a very safe thanks to its safety features such as overheat protection and a tip-over function from the sudden tilt of the heater where it will automatically turn off. The surface temperature of the thermal slots always remains low, so you should not worry if you accidentally touch them.

What We Like


  • Fast delivering the heat
  • The 4 wheels and the carrying handle
  • Storage space for the power cord
  • High portability
  • Adjustable thermostat
  • Quiet operation
  • The price

What We Don’t Like


  • It would be nice if the heater comes with remote control
  • It doesn’t have a digital display

9. Tangkula Oil Radiator Space Heater

Company: Tangkula

Price: $$

Our Rating: 9.2/10


Overview: This Tangkula Oil Radiator is a space heater that has superior heating capabilities at a very affordable price. Whether you need to heat small, medium or large rooms in the winter, this is a heater that should really be at the top of your shopping list.


Product Features

As you can see from the picture, this model comes in white, with a simple and modern design. The dimensions of this oil-filled heater are 14 inches in length, 10 inches in width and 25.6 inches in height with a base weight of 18 pounds (about 8.1 kg) which is normal for this type of heater.

The body of the heater has a solid rust-resistant metal construction. It has seven permanently sealed slots that are filled with 4 lbs of oil with high heat transfer. The maximum heating power of this Tangkula Oil Radiator space heater is 1500 Watts and you have 3 different modes of heating such as 600 Watt Low Mode, 900 Watt Medium and 1500 Watt High Mod. Also, the heater has a built-in thermostat so you can adjust the temperature and power consumption to your liking.

As for portability, this is one of the positive features of this heater. The heater comes with four mounted caster wheels for easy movement, and also on the upper front, there is a handle to lift the heater and move it to the required location where you want to use it for heating.

Another thing about this device, which is normally, it has safety features such as tip-over protection that will automatically turn off the heater if it falls down or tilted more than 45 degrees. For example, if you place the heater laying on the floor it will not work at all.

The other safety feature is overheating protection which prevents overheating if the heater runs for an extended period at maximum power. Another good thing is that the heater does not generate much noise during heating.

What We Like


  • Auto turn-off and overheat protection
  • It can be used for heating large rooms
  • An easy-carrying handle and 4 wheels

What We Don’t Like


  • There is no remote control
  • It doesn’t have an LCD screen

10. 1500W Oil-Filled Space Heater by Air Choice

Company: Air Choice

Price: $$$

Our Rating: 9.3/10


Overview: The oil-filled space heater from Air Choice is designed to successfully, efficiently and quickly heat not only small and medium-sized rooms but also large spaces.


Product Features

Not only does this 1500 watt space heater have excellent heating capabilities, but it also has a stylish and sleek black design that will fit perfectly into your home environment. The device measures 14.2 inches in length, 5.8 in width and 24.3 in height, and weighs 16.95 pounds (about 7.6 kg), which is not heavy at all. Despite its lightweight, this heater has a carry handle and quality and durable wheels for easy movement around your home.

As the top features of this heater, it should be mentioned the choice of three heating modes of 600 Watts, 900 Watts and 1500 Watts as the maximum operating mode. This allows you to choose the ideal heating mode for the room you are in. The controlling of the temperature will make you easy the adjustable thermostat that will allow you to set the desired temperature in the range of 59 to 95 degrees Fahrenheit. The heater will keep the temperature selected so that at the same time will save you electricity and money.

Also, this heater has dual safety protection which consists of tip-over protection that automatically shuts off the heater if it is tilted or pushed down to the floor as well as overheating protection to prevent unwanted incidents. A 12-hour smart timer should be highlighted, which will allow you to set the heater to work before turning off or after how long it needs to turn on again. The impressive thing is that you can operate this heater from any location in your room with the remote control.

What We Like


  • Digital display
  • Adjustable Thermostat
  • Remote Control
  • Dual Safety Protection
  • The Design
  • Wheels and handle for carrying
  • The smart 12-hour timer
  • The heater work quietly
  • The manufacturer offers a lifetime warranty

What We Don’t Like


  • The digital display is small

11. Honeywell HZ-789 EnergySmart Oil-Filled Space Heater

Company: Honeywell

Price: $$

Our Rating: 8.8/10


Overview: From the popular Honeywell brand on our list, we have the Honeywell HZ-789 EnergySmart oil-filled space heater with impressive heating capabilities. First of all, it has a sleek design that will fit well into your home, its dimensions are 13.7 x 9 x 24.4 inches and its basis weight is 21 pounds (about 9.5 kg) which is a little bit heavier than some similar models.

But that shouldn’t worry you at all because this device comes with easy-moving wheels, so you can easily move it to any room in your home. It’s also worth noting that besides these wheels this heater has a luggage-style handle which further enhances the portability of this device.

In addition to its portability, this heater is also a leader as an energy-efficient device, that is enabled by the advanced energy smart technology that is built-in this model. This heater will not only save you electricity but also save you money, which is another major reason to consider investing in this Honeywell HZ-789 EnergySmart oil-filled space heater.

It also has basic safety features such as a 360 ° tip-over feature that automatically turns off the heater if someone accidentally pushes it to the floor, overheat protection function and thermally insulated wiring so that the risk of fire is minimized. Honeywell HZ-789 EnergySmart is a 1500 watt space heater with 3 heating settings and an adjustable thermostat. It also has a 21-hour timer. When in use the heater does not make a noise, only the crackling noise when the heater is heating up.

What We Like


  • Easy-to-use digital control panel
  • Storage place for the power cord when the heater is not in use.
  • Fast heating abilities
  • The heater is energy efficient
  • The price

What We Don’t Like


  • You do not have good temperature control
  • The heater does not include a remote control
  • The wheels are made from plastic and are not durable

Buying Guide: How to Choose the Best Oil-Filled Space Heater for Your Home?


What You Need to Know Before Buying Oil Filled Space Heater



Portability is one of the main features to consider when purchasing an oil-filled heater. Portability lets you easily, without much effort, move your heater to any location in your room or need to warm up another room in your home such as the bedroom, the children’s room, your home office, garage, and basement and so on.

Fortunately, almost all oil-filled heaters have built-in auxiliary features that give them great portability. As one of the most important things that every oil-filled heater should have is wheels that can move the heater.

In most cases, the wheels will need to be mounted on the heater by you. This is actually a very easy job; you just need to follow the detailed instructions in the heater’s manual. Whereas, some space heaters come with already mounted wheels, which is more of a relief.

Another very important thing to look for in a heater is a carry handle. With the handle, you can easily lift and move the heater to the required location in your home.

One more thing: Some of the premium class oil-filled space heaters come with caster wheels that have a safety feature that lets you lock the wheels in position. No one wants the heater to move by itself to an undesirable location where in some cases it can be fatal to your home.

Best Oil Filled Space Heaters

Safety Features

Safety in our home is a top priority when it comes to using space heaters whether they are indoor or outdoor heaters. In this case, when talking about oil-filled heaters, they are much safer devices than other types of heaters such as ceramic, infrared, gas heaters, and mica thermal or outdoor heaters.

First of all, the oil that serves as a heat transfer is permanently sealed inside the fins and slots, meaning you have no contact with it.

Second, most oil-filled heaters are designed so that even at the highest operating temperatures, the temperature of their outer surface remains low and safe to touch.

Third, for more safety, they also incorporate advanced security features such as:

  • Overheating protection: the main function of this feature is preventing the heater from overheating while working, especially when operating at the highest mode for a longer period.
  • Tip-Over Protection: this feature will automatically switch off the heater if it accidentally falls down to the floor, or someone tilts it more than 45 degrees. This feature is especially useful if children or pets are playing nearby and if they accidentally move it from a position or push it to the floor, the heater will automatically turn off.

Another very important thing, I need to mention when it comes to the safety of this type of heaters. Oil-filled heaters do not use a ventilator to distribute warm air throughout the room; they use a convective way to heat the room.

This means that they do not move air, which means there is also no movement of dust, micro-particles, bacteria, and allergens throughout the room. This is very important if you or someone else in your family has allergies or asthma.



The timer is an important part of the oil-filled heater and you really need to make sure that the model you want to buy has a timer. With the timer, you can set your heater how long it will run before it automatically switches itself off. Also, some models of oil-filled heaters have the option to allow you to set the device to turn on automatically at a certain time.

Most top models offer a timer setting of at least 2 hours up to a maximum of 24 hours of operation. Apart from its practical application, another positive thing when the heater has a timer is that it protects the device from overheating and you also have control over your electricity consumption and your money.


The Number of Heat Settings

You will also need to consider the number of heat settings that the oil-filled heater has. Usually, most of these heaters have three heat settings, some premium models offer up to five different heat settings, while a small number of models offer only two heat settings.

The different number of heat settings will allow you to better adjust the temperature of your room according to your needs.


The Size of the Room

First of all, you need to know the size of your rooms that you want to heat in square feet. Oil-filled heaters have a certain maximum of heating area. If you know the right size of the room then you can easily determine the heating power required by your heater.

Oil-filled heaters are most effective if they are used for heating small and medium-sized rooms or for additional heating of certain areas in your room besides the main heating system such as close to your sofa, bed or next to your desk.

Also, some oil-filled heaters have the ability to heat larger rooms, but it still depends on the insulation of your home, the height of the ceilings and also you need to consider the winter climate in the region where you live. These are also key factors to consider when measuring your premises.

If the size of the room you want to heat exceeds the maximum heater area and the heating power that a top oil-filled heater has, then it makes sense that you should choose another type of heater that has powerful heating capabilities and will be able to heat larger rooms such as infrared heaters, kerosene or gas heaters.


The Output Power of the Heater

When you already know the size of the room you want to heat, then it will be much easier to determine the heating power that your oil heater needs to have. The heating power of the most powerful heaters ranges from 1500 watts to 2500 watts maximum.

But buying a 2000 watt or 2500 watt heater crosses the line that raises the question of energy efficiency and profitability. Will using a heater with such power really make it economical for you? This will mostly depend on your economic power.

The most popular and the most efficient and cost-effective heaters are the heaters between 1500 and 2000 watts. I even think that 2000 watts for a heater are on the threshold of efficiency and cost. But if you need a 2500 watt power heater and if your economic situation allows it, then you should not have trouble using very powerful 2500 watt heaters.

Otherwise, the minimum heating power you can get from a heater is 600 watts or 700 watts, which can be effective for heating very small rooms. The measure used for indoor and outdoor heaters is BTUs. It is obvious that, if the BTU has a higher rating, it means that the heater has the capability to produce a higher amount of heat per hour.

If you want to know how many BTUs is a 1500 watt heater and if you want to know how to calculate how many BTUs of heat are needed for a specific room or for the whole home, you can read our Ultimate BTUs guide here.


The Design of the Heater

For many people, design and color represent decisive factors when buying a space heater. For some people, the appearance of the heater is more important than its heating ability. They more prefer how the product will fit into their place of living.

But when it comes to oil-filled heaters, it’s a good idea to buy a larger-sized heater. The disadvantage of these larger size heaters is that they contain a greater amount of oil in their fins and slots. So it will take a long time for the oil to warm up before it starts releasing heat into the environment.

But the positive thing about these heaters is that if you turn off the heater, it will still emit heat in the room because the heated oil needs more time to cool. This is one of the main factors why oil-filled heaters are so popular.

Where to Place a Space Heater in a House

This Is Also Very Important: Read our ultimate guide to find out where is the safest place to place your indoor space heater in your home.

How Does An Oil-Filled Heater Work?


The way oil-filled space heaters work is very simple. Their design is the same as that of large standard radiators, only these ones are smaller and are portable.

In fact, oil-filled heaters have slots that are connected to each other, in most cases; there is an open space between them. Some models of oil-filled heaters are designed to have no open or empty space between the fins while some models are designed to have only one panel. Each design has its advantages and disadvantages.

These fins are filled with oil that has a high point of heating and high heat conductivity and the fins are permanently sealed. At the front, these heaters usually have a control panel designed to allow you to successfully control the heater.

Although these heaters are designed to heat rooms, they are designed also to have great portability. In order to work oil-filled heaters, they use electricity so you can simply plug them into your home’s power supply.

But let’s see how oil-filled heaters produce heat. Electricity simply enters a resistor which is usually located at the bottom inside the heater. The resistor converts electricity into heat, then this heat heats the oil in the heater, and so the heated oil begins to circulate through the fins.

During circulation, the heated oil transfers the heat on the fins and heats them. The heat is then transmitted out into the room which, by the principle of convective currents, warms the air.

Oil-filled heaters do not use fans so they do not generate noise and are therefore commonly used in offices, bedrooms and children’s rooms. Also, this type of heaters does not require much maintenance. All you have to do is clean up the dust settling on the heater fins from time to time.

Some FAQs about Oil-Filled Heaters


1. Can I Leave the Oil-Filled Heater On All Night?

Generally, when it comes to space heaters my answer is no. But in this case when we are talking about an oil-filled heater, if it has a thermostat and timer and they are in perfect condition then you can set the heater to overnight.

But be careful, you should not leave flammable materials in the vicinity or put towels and clothes on the heater to dry while you sleep. Here you can read why it is not safe to leave space heaters at night.


2. Do You Have to Refill an Oil-Filled Space Heater?

Heating oil is not used as a fuel for heat production. Its main purpose is to emit heat through the fins and slots in the room when it is heated.

Heated oil has the ability to store heat for a long time; in fact, it cools down much more slowly. This means when you turn off the heater, for some time the oil will still emit heat to the environment. Otherwise, the oil is permanently sealed and never changes.


3. Does the Oil-Filled Heater Use a Lot of Electricity?

These heaters do not use much electricity. They use just as much as other types of heaters such as infrared and ceramic heaters, which is 1500 watts.

A positive feature of oil-filled heaters is that they have additional features that allow you to have more control over your electricity consumption and bills.

For example, you can set the heater to work in a lower operating mode which in most cases ranges between 500 and 700 watts depending on the heater model. This way you can really save on electricity.


For sure, after reading our buying guide and browsing our list of best oil filled space heaters, you will have a clearer picture of what to look for in one oil-filled heater before you make a purchase. It will be much easier for you to determine what is the best oil-filled heater regarding the needs in your home when it is winter.

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