Do Oil Filled Radiators Need Refilling? Find Out Here!

Last Updated on April 18, 2023 by Simon
Do Oil Filled Radiators Need Refilling

Yes, oil filled radiators need refilling. The oil inside the radiator needs to be replaced periodically. This is done by removing the old oil from the radiator and replacing it with new oil.

The process of changing out the oil in an oil-filled radiator is not difficult. It's just like any other type of radiator except for one thing: there isn't much room for error when working with these types of systems.

You'll want to make sure that you follow the instructions carefully so that you don't damage anything while doing maintenance work. You should always use caution when dealing with electrical equipment.

How Does Oil Filled Radiators Work?

Many people wonder how oil filled radiators work, and what the benefits of using an oil filled radiator are.

Oil filled radiator comprises oil that is filled into the radiator by the user to provide heat. The oil does not always freeze like normal water-filled electric radiator.

A radiator is filled with water, which releases heat into the air through the radiator’s fins. The air cools the fins, which are exposed to the air of the room.

The oil inside the efficient radiator absorbs the heat and dissipates it by a thermal convection process to the surrounding air. However, the oil in the radiator does not get hot, unlike conventional dry radiators.

The oil is used to transfer the heat from the outside of the central heating radiator into the area where heat is needed. They used oil filled radiations in homes because they are affordable and require less maintenance than traditional water-filled radiator bodies.

The cool fins then release the excess heat into the air inside of the room. Oil filled radiators are a common sight in homes around the world.

They are often found in kitchens, living rooms, garages, and other areas where there is heat generated.

They are also safer to use since they do not contain any dangerous chemicals. In addition, oil filled radiators are much easier to install than traditional water-filled ones.

Should oil-filled radiators be refilled?

Like all other radiators, oil filled radiators need to be refilled as they lose heat as time passes.

Oil-filled radiators are air conditioner units that can be used for any type of radiator heat or cool spaces. They are called heat pumps.

If you’re wondering if you need to refill oil-filled radiators, it depends on the unit. Oil-filled radiators were once popular but are now only found in some locations.

It is recommended that you have your oil filled radiator serviced at least once a year. If your radiator is looking dusty, this might be a sign that you need to have it serviced.

To check whether an oil-filled radiator needs refilling:

  • First, turn off the power to the radiator at the circuit breaker or fuse box.
  • Next, remove the radiator grill, remove the fill cap on the top of the radiator, and fill the radiator with the amount of oil.
  • Replace the fill cap and grill on the top of the radiator, turn on the power, and wait for the oil radiator to heat.
  • Check the level of the oil.

Here’s how to refill:

The easiest way to determine the model number of your oil-filled electric radiator is to look for the letter “R” next to its nameplate on the front panel. The letters R stand for “radiator.”

You could refer to the manual provided by the original equipment manufacturer. It usually lists the model number along with other important information, like capacity.

In order to refill the oil, you need to first open the radiator and then unscrew the old oil filler, then fill it with fresh oil and replace the oil filler.

Note: You may also need to clean the radiator and flush it with water to remove impurities. Oil-filled radiators need to be maintained by adding the correct amount of all-purpose radiator oil.

When should you add more oil?

Oil-filled radiators must refilled every 2-3 years with the amount of oil specified by the manufacturer. These are especially useful in areas with high heating bills.

If you don’t have enough oil, this could cause damage to the system.

  • You may notice bubbles coming out of the radiator when you first start up your engine; this shows low levels of liquid in the tank.
  • Moderate amounts of liquid mean that the oil has evaporated because of the heating process and liquid convection heater cycle.
  • You should add more oil to radiators when you hear gurgling noises while the system is running.

Things to avoid when refilling Oil-Filled Radiator

1. When refilling an oil-filled radiator, refrain from using oil that is too cold or too hot.

2. Refrain from overfilling the radiator by checking how much oil is left in the radiator after refilling.

3. Avoid spilling the oil by having adequate space to refill.

4. Do not place excess hot water into the radiator, because the oil will rise to the top because of the pressure, and you will have a hard time pouring it back into its proper place.

5. Another thing you shouldn’t forget about when refilling oil-filed radiator walls is to keep track of how often you’ve added fluids so that you know what’s going wrong.

6. Don’t mix different oil. Don’t mix oil and water. 

7. Make sure the radiator has been emptied.

8. Leave the radiator for a few hours before refilling.

9. One common mistake people make when filling their radiators up is that they pour too little oil inside.

This causes overheating, which will lead to the destruction of parts of the motor. Overheating occurs whenever there is no adequate flow of fluid within the system.

Overheating leads to excessive wear and tear on an internal heating elements such as bearings. This makes them fail, causing further damage to the entire system.

Final Thoughts

If you already own an oil filled radiator, I would suggest getting a professional to inspect the system. If the tubes inside the radiator are rusted or leaking, then it might be time to replace the radiator.

If the system seems to work fine, then I would recommend having the system inspected once a year to make sure you won’t have any problems.

Article Written & Fact Checked By


I have always had a profound love for reading, which naturally evolved into writing too! This passion for the art of crafting stories using words lead me to a path of web content managing. I have previously managed portfolios for my clients' writing requirements, with each website containing anywhere from 5 all the way to 5,000 pages; my day was easily filled with spreadsheets and databases of content. My current focus is where I am the Lead Editor and Content Stategist!
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