DeLonghi Oil Filled Radiator Review

There is nothing quite as frustrating as waking up in the middle of a freezing night because your central heating just cannot keep up with a cold snap. You might try those cheap fan heaters, but they usually come with two big problems. They are incredibly loud and they make the air feel so dry that you wake up with a scratchy throat. If you are looking for a way to stay warm without the noise or the dry skin, you have likely looked into a DeLonghi Oil Filled Radiator Review to see if these classic heaters are worth the price.

I have spent a lot of time testing these units in various rooms of my house. I wanted to see if they really live up to the hype of being the gold standard for silent, steady heat. Most people want a heater that they can set and forget. They want something that makes a room feel cozy, not like a wind tunnel. After weeks of testing the Dragon 4 and Radia S models in drafty offices and master bedrooms, I have found that while these radiators are not perfect for everyone, they offer a specific kind of comfort that is hard to find elsewhere.

In this review, I will break down everything from how fast they actually heat up to the annoying “new heater smell” that everyone talks about. I will also look at how much they might add to your electric bill. This is an honest look at what it is really like to live with a DeLonghi oil heater during a long winter.

Quick Verdict Box

If you are in a hurry and just want the bottom line, here is the quick summary of my experience with the DeLonghi oil filled radiator series.

• Best For: Bedrooms, home offices, nurseries, and well insulated spaces where silence is a top priority.
• Key Strengths: Completely silent operation, excellent heat retention after turning off, and a very durable steel build that feels like it will last for decades.
• Main Limitation: They take a long time to warm up. You will not feel instant heat like you do with a fan heater, and the digital controls can be a bit confusing to program at first.
• Overall Recommendation: This is a premium supplemental heating solution. If you want a safe, quiet, and reliable heater that provides a gentle warmth without drying out the air, the DeLonghi is a fantastic investment.

Product Overview

The DeLonghi oil filled radiator is a portable electric space heater that uses diathermic oil to create warmth. It is important to know that you never have to change or refill this oil. It is permanently sealed inside the high quality steel fins. When you plug the unit in, an internal element heats the oil, which then circulates through the fins. This warms the metal, and the metal warms the air through a mix of radiant heat and natural convection.

These heaters are known for being much heavier than ceramic heaters. A standard 1500 watt model usually weighs around 25 pounds. This weight comes from the thick steel and the volume of oil inside. While it makes them a bit harder to carry up stairs, that extra mass is what allows them to hold onto heat so well.

Key Features and Performance

Heating Performance

One of the first things I noticed during my testing is that you have to be patient with an oil heater. Unlike a fan heater that blows hot air the second you turn it on, the DeLonghi takes about 15 to 20 minutes before the fins are even hot enough to start warming the room. In one specific test, it took over three hours to raise the temperature in a small room by just 5 degrees. This might sound like a deal breaker, but the goal here is not a quick blast of heat. It is about creating a stable, long lasting thermal envelope.

The Dragon 4 model features a unique “thermal chimney” design. This design encases the fins in a metal shell, which creates a chimney effect. Cold air is sucked in from the bottom, heated by the fins, and then pushed out through the top vents at a faster rate than a standard open fin radiator. I found that this design definitely helps circulate the heat better in rooms with higher ceilings. Even though it is slower to start, once the room reaches the target temperature, the heat feels much more natural and consistent than the “on and off” blasts of a furnace.

Energy Efficiency

When we talk about energy efficiency, it is important to remember that all electric heaters are technically 100% efficient at turning electricity into heat. However, the DeLonghi helps you save money by how it manages that heat. Most models come with an Eco Plus function. This mode automatically adjusts the power level based on the room temperature. If the room is very cold, it uses the full 1500 watts. As the room gets closer to your desired temperature, it drops down to 800 or 700 watts to maintain the warmth without wasting energy.

I also found that the diathermic oil acts like a battery for heat. Even after I turned the unit off, it stayed hot for about 15 to 20 minutes. This means the heater can stay off for longer periods while still providing warmth. DeLonghi calls this “Real Energy” technology, and they claim it can make the unit up to 20% more efficient than basic heaters that do not have smart power management.

Noise Level

This is the area where the DeLonghi truly shines. It is virtually silent. Because there is no fan, there is no whirring or air noise at all. This makes it the best choice I have ever found for a bedroom or a nursery. You can sleep right next to it and never hear a thing.

However, you should expect a few small sounds. When the heater is first warming up, you might hear some faint clicking or popping sounds. This is just the metal fins expanding as they get hot. I also noticed a distinct mechanical click every time the thermostat turns the unit on or off. It is not loud enough to wake a sleeping baby, but you will notice it if the room is perfectly quiet.

Safety Features

Safety is a huge concern for anyone with pets or kids, and DeLonghi has built in several layers of protection. All their modern radiators include a tip over switch. I tested this by gently tilting the heater, and it cut the power immediately. It also has a thermal cut-off feature that prevents the unit from overheating if it is accidentally covered by a blanket or towel.

The Dragon 4 model is particularly interesting because the “chimney” design keeps the sides of the heater a bit cooler to the touch compared to old fashioned radiators. While the top vents still get extremely hot and can cause burns, the side panels are generally safer if a pet or child accidentally bumps into them. There is also a child lock on the digital models that prevents little hands from changing your settings.

Build Quality

When you pull a DeLonghi radiator out of the box, the first thing you notice is how solid it feels. The steel assembly is heavy and the paint finish is usually a high quality, corrosive resistant multilayered coating. These units feel like they are built to last for decades, and many people report their older DeLonghi heaters are still working after 20 or 30 years.

The wheels are often pre-assembled, which is a nice touch. DeLonghi calls them “SmartSnap” wheels. They fold out from the base without needing any tools. However, while the metal body is top tier, some of the plastic components like the wheel brackets and the digital buttons can feel a little less premium over time.

Portability

Even though these heaters are heavy, they are surprisingly easy to move on flat surfaces. The handles are well placed, usually with one on the front and one on the back, allowing you to guide the heater easily. The wheels glide perfectly on hardwood and tile floors.

However, I ran into some trouble on thick carpet. Because the heater is so heavy and the wheels are relatively small, they tend to sink into deep rugs. There are reports of the folding wheels actually collapsing inward if you try to push the heater across a thick carpet. If you have a lot of rugs, you might find yourself having to lift the unit more often than you would like.

Ease of Use

DeLonghi offers both mechanical and digital models. The mechanical ones have simple dials that are very easy to understand. The digital models look much more modern and have a clear LED display, but they come with a learning curve.

I found the 24 hour programmable timer on the digital models to be a bit frustrating. It is not always clear if you have set it correctly, and the buttons can be non-intuitive. One great feature, however, is the “Anti-Freeze” setting. You can set the heater to stay at about 41 degrees Fahrenheit. If the temperature drops below that, the heater kicks on automatically. This is perfect for keeping pipes from freezing in a basement or a cabin while you are away.

Real World Pros and Cons

After using these heaters in real world conditions, here is the honest breakdown of what I liked and what I didn’t.

Pros

• Total Silence: It is the only heater that truly doesn’t make a sound while running.
• Doesn’t Dry the Air: Since there is no fan blowing air across a red hot element, the humidity stays much higher in the room.
• Heat Retention: The oil stays warm long after you turn it off, which feels much more efficient.
• Built to Last: The steel construction is very high quality and designed for long term use.
• Safe for Families: The rounded edges and chimney design make it safer than many other radiant options.

Cons

• Slow to Warm Up: You have to plan ahead and turn it on at least 20 minutes before you need the room to be warm.
• Heavy Weight: At 25+ pounds, it is not something you want to be carrying up and down stairs every day.
• New Heater Smell: The first time you use it, it can put off a strong chemical odor that takes a while to go away.

Who Should Buy This Heater

I think the DeLonghi oil radiator is a perfect fit for a few specific groups of people.

• Bedroom Users: If you are a light sleeper and need a quiet room, this is easily the best choice on the market.
• Parents with Infants: The gentle, non-drying heat is ideal for a baby’s nursery where maintaining air quality is important.
• Home Office Workers: If you spend all day sitting at a desk, the steady radiant heat will keep you much more comfortable than a fan heater that keeps clicking on and off.
• Owners of Older Homes: If you have high ceilings and your central heat struggles, these units provide that classic radiator feel that fills the space.

Who Should Avoid It

While I love these heaters, they are definitely not for everyone.

• The “Instant Heat” Crowd: If you just got home from the gym and you are freezing and want heat now, you will be disappointed. Get a ceramic fan heater instead.
• Drafty Garages: These radiators work by warming the air mass in a room. If your space is very drafty or has zero insulation, the heat will escape faster than the radiator can produce it.
• People with Mobility Issues: If you have trouble lifting 25 pounds, moving this heater around will be a struggle, especially on carpeted floors.

Comparison Section

When you are shopping, you might see the Honeywell HZ-789 or Pelonis radiators next to the DeLonghi.

DeLonghi vs. Honeywell HZ-789 The Honeywell HZ-789 is a very popular competitor. It is usually a bit cheaper and comes with a remote control, which is a feature DeLonghi often leaves out. The Honeywell also has a smaller footprint, making it easier to fit into tight corners. However, in my experience, the DeLonghi feels more “heavy duty.” The steel on the DeLonghi feels thicker, and the Dragon 4’s chimney design distributes heat more effectively than the Honeywell’s standard fin design. If you want a remote and a lower price, go for Honeywell. If you want the most durable and effective heat distribution, stick with DeLonghi.

Final Verdict

Choosing a space heater usually comes down to whether you want speed or comfort. After conducting this DeLonghi oil filled radiator review, it is clear that DeLonghi has chosen comfort and durability. These heaters are not the fastest, and they are certainly not the cheapest. But they offer a level of silence and “soft” heat that you just can’t get from a plastic fan heater.

If you are tired of noisy fans and dry air, I highly recommend picking up a DeLonghi unit. It is a solid, reliable piece of equipment that you will likely still be using ten years from now. I suggest looking at the Dragon 4 model if you have a larger room, or the compact TRN models if you need something for a bathroom or small office. While the digital controls can be a bit of a pain to learn, the overall quality of the heat makes it worth the effort.

It is a great idea to view on Amazon to see the current prices, as they often go on sale during the shoulder seasons. If you are looking for a reliable way to survive the winter without breaking the bank on your central heating bill, this is a smart, soft recommendation from me.

FAQ Section

Do I ever need to add oil to the radiator? No, you never have to add or change the oil. The diathermic fluid is permanently sealed inside the steel fins at the factory and is designed to last the entire life of the product.

Why does my new DeLonghi heater smell like chemicals? This is normal for new oil heaters. It is caused by the powder paint coating and protective oils on the metal curing as they heat up for the first time. It is best to run the heater on max power for 2 to 8 hours in a garage or well-ventilated room before moving it into your living space.

Is it safe to leave a DeLonghi radiator on all night? Yes, they are designed for long-term use. The built-in thermostat, thermal shutoff, and tip-over switch provide multiple layers of safety. Just make sure it is at least three feet away from any flammable materials like curtains or bedding.

Does an oil heater use a lot of electricity? At its maximum setting, it uses 1500 watts, which is the same as almost any other space heater. However, because it holds heat so well and uses an Eco Plus mode, it may run for less time than a fan heater to keep a room at the same temperature.

What is the best setting for a bedroom? I recommend using the Eco Plus mode and setting your desired temperature (around 68-70 degrees). This allows the heater to manage the power usage silently while you sleep, preventing the room from getting too stuffy.

How do I clean my oil heater? Since there is no fan to suck in dust, they stay quite clean. You can simply wipe the exterior with a soft, damp cloth when the unit is unplugged and completely cool. Make sure to keep the vents on the top and bottom clear of any household dust buildup.