DeLonghi KH390715CM Oil Filled Radiator Heater: Review 2021

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, talking about our own experience using the heater and looking at reactions to the heater from verified customers as well.

Is DeLonghi a Good Company?

DeLonghi (or De’Longhi) is best known for their 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, for 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 – in fact, while not cheap, they’re competitively priced compared to other space heaters, and outright bargains considering how well they are built and how well they work – and, all DeLonghi space heaters come with a full 3-year manufacturer’s warranty!

What is an Oil-Filled Radiator Heater?

First invented and developed by DeLonghi, and now often imitated, an oil-filled radiator heater is a radiant heater, similar in many ways to any other radiator heater, but with an important basic difference in design which allows it to be very efficient and also to output a deeply warming and wonderful feeling heat, which somehow feels better than what you get from so many other radiant heaters.  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 heater can save lots of money on utility bills compared to even other radiant heaters – which are already known to be very, very energy efficient and real money-savers. Plus, oil-filled heaters still enjoy all 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
  • Better Air Quality and No Allergens
  • Makes the Air Less Dry than many other types of heaters
  • And, again, Real Savings on Utility Bills!

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 favourable reviews all the way up and down their line of oil filled radiant heaters. Indeed, our own experience corroborates this, and we found the Comfort Heater Light radiator space heater to put out absolutely wonderful deep radiant heat – and plenty of it – as well as being a joy to use.

What is Our Experience with the DeLonghi KH390715CM Comfort Heater Light Oil Filled Radiator Heater?

One thing we’ve learned here at Know the Flo is that you should always allow a portable space heater a break-in period. So the first thing we did with the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator is set it up in our garage and let it run 24 hours continuously, allowing it to burn off any new-heater smell.

This is definitely not something just a DeLonghi space heater needs, or something that is specific to oil-filled radiators, but a good idea with any new space heater of any type and from any company. Once broken in thus, the DeLonghi Comfort Heater Light never had even the slightest detectable odour during all of its indoor use. That indoor use included all kinds of spaces and rooms, from very small bedrooms to large family rooms, rooms with lots of sun and rooms with no windows, open areas and more closed up spaces.

Our results were uniformly excellent. In all but the largest and most open rooms, the DeLonghi’s Comfort Heater Light setting worked perfectly to keep the temperature nicely warm and even, with the whole room well heated – this consistently uniform and room-filling warmth is not something we would always expect from a radiant heater without a fan, and the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator was delightful in this respect, as much as the heat was deep and satisfying.

With the largest or most open rooms, including basement rooms with little or no sunlight, we found that leaving the KH390715CM Comfort Heater Light oil-filled radiator on continuously on the highest heat settings worked great and that this space heater can actually effectively heat spaces a bit bigger than the literature suggests.

This full-blast approach did use a bit more electricity, while the Comfort Heater Light setting is remarkably efficient and uses noticeably less energy, but at any setting or level the KH390715CM radiator heater is very energy efficient, the oil-filled reservoirs not only offering a more stable and reliable temperature but for longer-lasting heat with less electricity. And so we found ourselves very happy and satisfied with the DeLonghi Comfort Heater Light radiator’s heating ability all around the house and really liked the way it made our rooms, and us, feel.

We were also quite happy with the design of the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator, which has a nice retro look to it, smooth, clean lines, an extremely intuitive and simple control panel and an overall high-quality feeling to it. The nice design made the DeLonghi  Comfort Heater Light really easy to move around, with a smart cord spool at the bottom for storing the electric cord, a comfortable handle and really good wheels.

The cool-touch exterior, one of several safety features and a real comfort for people with children, pets or absent-minded spouses, made carrying and moving the space heater even nicer. The whole time we tested the DeLonghi KH390715CM Comfort Heater Light oil-filled radiator we were impressed – it works great for a much larger range of room sizes than we would have expected, it is clearly a very well built product, it is simple to use and maintains temperature very well, and the warmth is deep and feels wonderful. We are happy to have found the DeLonghi Comfort Heater Light and happy to be able to recommend it so enthusiastically.

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 allows them to just set the heater and forget about it, enjoying the nice radiant heat and the surprisingly effective way it fills their space. Customers also tended to relate the “set it and forget it” feeling to the safety features of the DeLonghi oil-filled radiator, saying that the peace of mind that comes from over-heat protection, cool touch surfaces and obviously high gauge electrical wires and the overall heavy-duty construction is really nice, and not something they found with cheaper products.

But most people talked about the effectiveness of the KH390715CM Comfort Heater Light radiator space heater, and how, again, it worked much better than its specifications might suggest. While some said it wasn’t as effective with larger rooms, or that it took too long to heat, it was almost humorous how others, feeling almost protective of their beloved DeLonghi radiator, came to its defence and 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 odour-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 odour 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 odour.

When customers gave their DeLonghi KH390715CM oil filled radiator enough time to do its thing, they were pretty much unanimous about its remarkable performance for the money. People tend to be fiercely loyal to DeLonghi as a company, and to their products, and the heaters are no exception. Indeed, we see more repeat customers for DeLonghi space heaters than maybe any other company’s – even more remarkable considering that customers tend to have them for many years!

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

✅ Pros❌ Cons
Extremely Energy Efficient – saves money even compared to other oil-filled space heatersEmits an odour when you first use it
Deep, Warm, Even-Heat & Quiet, even Silent, OperationVery few people mention this and acknowledge that the odour goes away right away – after the ‘burn-in” period – and doesn’t come back
Effectiveness in Larger Spaces than ExpectedTakes 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
Complete Safety Features & Great Warranty (3 Years) and Customer Service

Although, again, when given the time any radiant heater needs, the DeLonghi Comfort Heater Light performs better than suspected in terms of room size and steady heat.

DeLonghi KH390715CM COMFORT HEATER LIGHT  Oil-Filled Radiator Heater Features and Specifications

  • Heating Element: Electric
  • Heating Type: Oil-Filled Radiant
  • Heating Power: 700, 800 & 1500 Watts
  • Effective Heating Area: 250 Square Feet (~23 Square Meters)
  • 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: 3 Year Limited Manufacturer’s Warranty


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

Any good radiant heater is a great idea these days, with winter fast approaching, and especially considering how much time we are all spending at home. In fact, it is more important than ever to have a good, effective space heater – they not only make living and working at home much more comfortable but will save you lots of money on your utility bills since you can 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.

Thanks for reading this article – DeLonghi KH390715CM Comfort Heater Light Oil Filled Radiator Heater: Full Review 2021 – and please check with us again with any questions you have about home heating and cooling.