Oil-Free vs Oil-Filled Radiators: Which is Right for You?

Terma Rolo Room E White Electric Oil Filled Smart Radiator

When you walk into a room on a cold, crisp day, there’s nothing better than feeling the comforting warmth of a radiator enveloping you. So, when it comes to heating up your home, you can see why choosing the right type of radiator is crucial to creating this perfect, warming moment. But a question we all may face is this: what’s the best one for our homes?

Two popular options on the market are oil-free and oil-filled radiators. Both have their own set of advantages and are suited to different needs. But which one would be best for you?

In this blog, we will delve into the oil-free vs oil-filled radiators debate and compare these two types to help you decide which one is the right fit for you.

What are the Key Differences Between Oil-Free and Oil-Filled Radiators?

TCP Smart WiFi Electric Glass Panel Heater White

Although both oil-free and oil-filled radiators come in many different styles, including electric radiators and smart electric radiators to name a few, there are some crucial differences between the two. So, before we dive into the specifics of each type and start making any rash decisions, it's important to understand the fundamental differences between these radiators.

Heating Mechanism

Radiators that are oil-filled use oil as a heat reservoir, which is heated by an electric element and then radiates warmth. Oil-free radiators, on the other hand, use either ceramic plates, metal heating elements, or other advanced technologies to generate and disperse heat.

Warm-Up Time

No one wants to be waiting around for their radiators to get warm. While oil-filled radiators typically take longer to heat up due to the waiting time of oil heating up, radiators free of oil are at an advantage and generally heat up much more quickly.

Portability and Weight

Delonghi Radia S 1.5kW Oil Filled Radiator

If you want a radiator that you can move freely from room to room, an oil-filled radiator probably won't be the best choice as they are usually heavier due to the oil content. In comparison, oil-free models are lighter and much easier to move around.

Maintenance

Maintaining a radiator can be a tiresome task. That's why finding one that requires minimal upkeep can be crucial. Luckily, both types of radiators are pretty low-maintenance! An oil-filled radiator requires less frequent maintenance because the oil is sealed inside and doesn't need replacing. Oil-free radiators, being simpler in construction, are also low-maintenance (unfortunately, the drawback is that occasional dusting or cleaning of the heating element may be required).

Safety

Safety can be a key element to a radiator, especially for people living with pets or children. Oil-free radiators often come with advanced safety features, such as overheat protection and cool-touch surfaces, making them a safer choice. Oil-filled radiators are also safe but take much longer to cool down after being turned off, meaning little fingers could get burned easily.

How Do Oil-Free Radiators Work?

Stelrad Compact K2 Type 22 Radiator

Now it's time to get into the nitty-gritty. Oil-free radiators utilise modern heating technologies that don’t rely on oil to heat up. Instead, they use materials like ceramic or aluminium to conduct and radiate heat.

They tend to heat up more quickly compared to oil filled radiators because there's no need for oil to warm up, making them a faster option for those looking to rapidly increase the temperature of a room. However, they cool down faster once turned off, as there’s no medium to retain heat.

Oil free models are generally lighter and more portable, making them a good choice for those who frequently move their heaters between rooms. Additionally, they are considered more environmentally friendly since they don’t contain oil, and there's no risk of leaks.

What are the Benefits of Oil-Free Radiators?

white radiator hanging in a kitchen

Oil-free radiators come with a range of benefits that make them an attractive choice for many households. We've dabbled in a few above but let's take a closer look at the key benefits of these radiators:

  • Quick Warm-Up: Since there’s no oil to heat, these radiators start emitting heat almost immediately after being turned on, making them ideal for quick, temporary heating.
  • Lightweight and Portable: Without the added weight of oil, these radiators are lighter and easier to move from room to room, offering greater flexibility.
  • Energy Efficiency: Oil free models can be more energy-efficient, particularly for short-term use, because they don’t waste energy heating oil first.
  • Environmentally Friendly: Since they don’t use oil, these radiators are a more eco-friendly option, avoiding the use of potentially hazardous fluids.
  • Safety: They often come with advanced safety features, such as automatic shut-off and cool-to-the-touch exteriors, which make them safer around children and pets.

How Do Oil-Filled Radiators Work?

Terma Ribbon VE Copper Electric Oil Filled Smart Radiator

On the opposing side, radiators filled with oil, despite their name, don't burn or consume oil. Instead, the oil inside acts as a heat reservoir. These radiators contain a special thermal oil that heats up when electricity passes through the heating element. This oil retains heat for longer periods, allowing the radiator to continue warming the room even after it has been turned off.

These radiators operate silently and offer consistent, slow-releasing heat which can be beneficial, making them ideal for maintaining warmth in well-insulated spaces. Since they heat through convection and radiation, they tend to be more energy-efficient for prolonged use, as the oil remains warm for hours without needing constant electricity.

What are the Benefits of Oil-Filled Radiators?

Terma Rolo Room E True Copper Electric Oil Filled Smart Radiator

Oil-filled radiators have been a staple in home heating for generations, and for good reason! Here are some of their key benefits:

  • Long-Lasting Heat: Even after being turned off, the oil inside retains heat, continuing to warm the room for some time. This makes them highly efficient for long-term heating.
  • Silent Operation: Since there are no fans involved, oil filled radiators operate silently, making them perfect for bedrooms or quiet spaces.
  • Low Maintenance: The oil inside these radiators is sealed and doesn't need replacing, making them very low-maintenance over their lifespan.
  • Even Heat Distribution: Oil-filled radiators provide steady, even heat that’s less likely to cause hot spots or uneven warming in a room.

Which Radiator Works Better for You?

cat lying on a radiator

Ultimately, the choice between an oil-free and oil-filled radiator largely depends on the specific heating requirements you desire. If you're in need of a radiator that heats up quickly and is lightweight, then an oil-free radiator is the one for you. On the other hand, if you want a radiator that provides consistent, long-lasting heat with minimal noise, an oil-filled model is the perfect choice.

Whichever radiator you choose, the end result will be a warming one.


At Plumbworld, we offer a wide range of both oil-free and oil-filled radiators to suit any heating need. Whether you're looking for a portable, lightweight model for occasional use or a sturdy, long-lasting radiator for consistent warmth, you'll find a variety of options to choose from. Visit our website today to view our full range of radiators.

If you found this post useful, you may also like How To Clean Your Electric Radiator - Choosing the Best Radiator for Your Home - Designer Radiator Buying Guide.


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