DeLonghi KH390715CM Oil-Filled Radiator Heater Review

The KH390715CM Comfort Heater Light oil-filled radiator heater is DeLonghi’s mid-priced radiant heater, but it still retains the look and feels of a premium product, with a beautiful design so typical of DeLonghi and real quality in materials and construction. 

But is the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator a good space heater? Let’s find out, by exploring the KH390715CM and how it works, looking at reactions to the heater from verified customers as well.

Is DeLonghi a Good Company?

DeLonghi (or De’Longhi) is best known for its beautiful espresso machines, coffee makers and coffee grinders, and, well, all things coffee, and is considered one of the finest companies, and an obvious choice for top quality, coffee shops, restaurants, and private homes all around the world.

But DeLonghi also makes some of the finest products beyond coffee – if there is indeed a world beyond coffee – including kitchen appliances of all types, air conditioners, heaters, air purifiers, and more. If you’ve ever priced a DeLonghi espresso machine, you know that they are pretty darned expensive – and we would fully expect this for such superb and absolutely stunning products. And the same is true of many of their brilliantly styled and beautifully made home appliances.

That’s why we are so pleasantly surprised that the DeLonghi oil-filled radiator heaters are so reasonably priced: while not cheap, they’re competitively priced compared to other space heaters, and good value considering how well they are built. Check the warranty length on the product page before you buy.

What is an Oil-Filled Radiator Heater?

An oil-filled radiator heater warms the room with heat from its fins, similar in many ways to any other radiator heater, but with an important basic difference in design: it is filled with oil that holds the heat and gives it off steadily, which many people find feels deeply warming. An oil-filled heater is different in that it’s, well, oil-filled.

It has a permanently sealed internal reservoir that extends throughout the heating fins and contains diathermic oil, which heats up with the heater and maintains that heat over long periods of time, only cooling down very slowly.

This system holds heat so well that an oil-filled radiator keeps giving off warmth after its element switches off. It does not use less electricity for the same amount of heat: a 1,500-watt heater costs about 27 cents an hour at the 18.31 cents per kWh U.S. average price in July 2026. Plus, oil-filled heaters still enjoy most of the main benefits of normal radiant heaters, including:

• Uniform, Consistent Heating
• Quiet Operation
• No Maintenance
• Less Expensive than many other types of heaters
• Deep Heating and Comfort
• Doesn’t blow dust around the way a fan heater does
• Quiet, with no fan
• And, again, a steady heat that can cycle off to save electricity

Does DeLonghi make a Good Oil-Filled Radiator Heater?

So you must be wondering a couple of things:

• Is the DeLonghi KH390715CM Comfort Heater Light a Good Oil-Filled Radiator Heater?
• Is the DeLonghi KH390715CM Comfort Heater Light Worth the Money?

DeLonghi is certainly loved by customers and enjoys among the very highest customer ratings and the most favorable reviews all the way up and down their line of oil-filled radiant heaters.

What do Customers Say about the DeLonghi KH390715CM Comfort Heater Light Oil-Filled Radiator Heater?

After poring through lots and lots of verified customer reviews, we can safely say that customers are also very happy with their KH390715CM Comfort Heater Light radiator space heaters. Perhaps it’s not surprising that so many customers praised the DeLonghi Comfort Heater Light radiator for its ease of use.

People not only mention the easy and intelligent layout of the controls, but also the Comfort Heater Light system, which lets them set the temperature and enjoy the nice radiant heat and the surprisingly effective way it fills their space. Customers also tended to like the safety features of the DeLonghi oil-filled radiator, saying that the peace of mind that comes from over-heat protection, low-temperature surfaces and the overall heavy-duty construction is really nice, and not something they found with cheaper products. Even so, CPSC says never to leave a portable heater on while you sleep or leave it unattended.

But most people talked about the effectiveness of the KH390715CM Comfort Heater Light radiator space heater. While some said it wasn’t as effective with larger rooms, or that it took too long to heat, others said that you just need to give it time to heat and slowly fill the space with the luxurious warm oil heat, and if you did the performance, and the feeling, were wonderful.

In fact, customers are very impressed with several basic things about the DeLonghi KH390715CM Comfort Heater Light and all Delonghi oil-filled space heaters, especially when compared to other brands and types of heaters, including:

• Quality look and feel
• Quiet operation
• Ease of use
• Reliability
• Clean air and odor-free heat
• Big savings on utility bills, even compared to other space heaters
• Beautiful design

As far as negatives, there were very few to speak of, but people did talk about a small amount of odor when the DeLonghi Comfort Heater Light oil-filled radiator is brand new, and that small clicking sound when it first heats up but also saying that these things go away, and in fact talking more about the lack of operating noise, noxious fumes or odor.

When customers gave their DeLonghi KH390715CM oil-filled radiator enough time to do its thing, most were happy with its performance for the money. Many customers are loyal to DeLonghi as a company, and to their products, and the heaters are no exception.

DeLonghi KH390715CM COMFORT HEATER LIGHT  Oil-Filled Radiator Heater Pros & Cons

✅ Pros	❌ Cons
Holds heat after the element cycles off, so it can run less often	Emits an odour when you first use it
Deep, Warm, Even-Heat & Quiet, even Silent, Operation	Very few people mention this and acknowledge that the odor goes away right away – after the ‘burn-in” period – and doesn’t come back
Steady heat in small and medium rooms	Takes longer to fill large spaces with heat
Ease of Use and Intelligent Design & Beautiful Modern Styling
Cleaner Running, Odorless, and No Noxious Emissions
Very High Material and Build Quality and Extreme Reliability
Safety features, a manufacturer’s warranty and customer service

Although, again, when given the time any radiant heater needs, the DeLonghi Comfort Heater Light gives steady heat in small and medium rooms.

Features & Specifications

• Heating Element: Electric
• Heating Type: Oil-Filled Radiant 
• Heating Power: 700, 800 & 1500 Watts
• Room size: at about 10 watts per square foot, 1,500 watts suits roughly 150 square feet
• Safety Features: Smooth, Cool-Touch Surfaces; Auto-Off for Tip-Over or Overheating 
• Reliable and Easy to Use Mechanical Controls
• Built-In Room Thermostat
• Anti-Freeze Circuitry
• Rust-Resistant Durable Metal Construction
• Integrated Power Cord Spool & Heavy-Duty Caster Wheels
• Size: 5.9 x 13.8 x 24.8 Inches 
• Weight: 22.12 Pounds
• Warranty: limited manufacturer’s warranty (check the length on the product page)

Final Thoughts: Should You Buy a DeLonghi KH390715CM COMFORT HEATER LIGHT Oil-Filled Radiator Heater?

A good space heater can make living and working at home much more comfortable, and it can lower your utility bills if you heat only one space or room in your home and keep the furnace running at a much lower level.

Of course, you can get a less expensive space heater, but for this level of quality in materials and construction, for its great design and appearance, its ease of use, its effectiveness, and the wonderful feeling of its warm oil radiant heat, the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator is well worth the money – a great value in the DeLonghi line, and an even greater one when compared to any other manufacturers.