There is a satisfying kind of appliance that makes a room comfortable without demanding anything from you. The DeLonghi Radia S Oil Filled Radiator, model TRRS0715E, is built around that idea, pairing The Quiet, even heat of an oil filled radiator with a digital timer and an ECO energy saving mode that do the thinking for you. In a category full of basic dials and manual thermostats, the Radia S stands out because it can be told when to wake up, how warm to get, and when to stand down. This review is the record of living with the Radia S through a full month of cold weather, and whether its extra controls earn their keep.
Before the details, the standard note. This article contains affiliate links, and if you buy through one of them the site earns a small commission at no extra cost to you. That commission does not change what I test or what I recommend, and every product here is treated the same way I would treat one bought with my own money.
Design and Build
The Radia S takes the classic oil filled radiator shape and gives it a contemporary finish. The light gray paint and clean lines let the radiator sit in a living room or bedroom without looking like a piece of workshop equipment, which is more than most heaters manage. The fins are sealed steel columns filled with oil, and the construction is solid with no rattles after a month of daily use and regular rolling around the room.
The paint finish is worth a specific mention. It resists the light scratches and scuffs that cheap heaters pick up within days, and it does not yellow near the heat source the way white plastic can. After a full month of use, including being rolled across hard floors, the exterior still looks as clean as the day it arrived.
The control panel is the big departure from the basic TRH models. Instead of two rotary dials, the Radia S uses a digital interface with a small screen, a 24 hour timer, and buttons for the heat settings and the ECO mode. The panel is easy to read in low light, and the buttons give a clear response when pressed, though the interface does take a few minutes to learn the first time you set a schedule.
Three wheels on the base and a recessed handle make the radiator genuinely easy to move, and at a modest weight for an oil filled unit, carrying it from bedroom to office is not a chore. The light gray finish hides dust well, and the whole unit feels like a step up in design quality from the utilitarian heaters most people have owned.
Key Features
The headline feature is the digital 24 hour timer. You can program the radiator to switch on before you wake, hold warmth through the day, and power down before you leave, which turns a space heater into something closer to a scheduled heating system. Once programmed, the Radia S runs its routine without any daily input from you.
The ECO energy saving mode is the second feature that sets this model apart. It uses a lower temperature profile that keeps the room comfortable while drawing less power, and for anyone running a heater for hours a day, that difference shows up in the bill. There are three heat settings, so you can run the radiator gently at around 900 watts or push it to the full 1500 watts for faster warm up, and the adjustable thermostat cycles the element to hold whatever temperature you choose.
The safety package matches the rest of the range: overheat protection, a tip over switch that cuts power if the unit falls, and a surface that stays warm rather than dangerously hot. The oil filled design also means the heater never dries the air or stirs up dust, and it operates in complete silence apart from the soft click of the thermostat.
Real-World Performance
I set the Radia S up in a home office that faces the worst of the morning cold, programmed the timer to switch on an hour before I started work, and let it manage itself. The reliability of the schedule became the thing I appreciated most. The room was warm before I walked in, the heater held that warmth through the day, and in the evening the ECO mode kept things comfortable at a lower power draw without any fiddling.
One detail that stood out over the month was how consistent the programmed routine stayed. There was no drifting, no skipped on cycles, and no need to re set the schedule after the occasional power cut. Once the timer was taught the daily pattern, it simply ran, which is exactly the hands free behavior this heater promises on the box.
The heating itself is classic oil filled behavior. Warm up is gradual, building over twenty to thirty minutes rather than blasting heat in seconds, but the warmth is even and the thermostat holds a steady room temperature without the hot and cold swings of a fan heater. The silence was a constant pleasure, and the air never felt parched even after a full day of running.
The ECO mode delivered on its promise in real terms. Running the radiator on the ECO schedule through the day drew noticeably less power than the same period at full heat, and the room stayed at a usable temperature throughout. The timer worked flawlessly through the month, holding its program across power cycling, and the control panel was clear enough that I stopped needing the manual within a couple of days.
Pros and Cons
Pros:
- Digital 24 hour timer turns the heater into a scheduled system
- ECO energy saving mode trims power draw during long use
- Silent, even, Radiant heat that does not dry the air
- Modern light gray design that suits living spaces
- Full safety suite with overheat and tip over protection
Cons:
- Slower to warm a cold room than a fan heater
- Digital interface takes a short learning curve
- Pricier than the basic dial controlled models
How It Compares
The Radia S sits between the budget oil filled heaters and the premium smart heating category. The table below places it against its main alternatives.
| Feature | DeLonghi Radia S | Basic Oil Filled Heater | Ceramic Fan Heater |
|---|---|---|---|
| Timer | Digital 24 hour | None | Usually none |
| Energy mode | ECO setting | None | None |
| Warm up speed | Slow and steady | Slow and steady | Very fast |
| Noise | Silent | Silent | Fan hum |
| Air Quality | No drying, no dust | No drying, no dust | Can feel dry |
| Price | Moderate | Budget | Budget |
The extra cost over a basic radiator buys the timer and the ECO mode, and for anyone who runs a heater for hours a day, that is a real and recurring benefit rather than a gimmick. A ceramic fan heater will still win on instant warmth, but it cannot hold a schedule, stay silent, or deliver the even heat of an oil filled unit. If you want to set your warmth and forget it, the Radia S is the strongest value of the three.
Who Should Buy It
Buy the DeLonghi Radia S if you run a space heater for long stretches, because the timer and ECO mode are exactly the tools that make long running hours affordable and hands free. It is also ideal for anyone who wants a heater that can warm a bedroom overnight in silence, or a home office that should be warm before you arrive.
Skip it if you only need occasional spot heat and would rather spend less on a basic model, or if you want instant warmth for a drafty room, where a fan heater serves better. For steady, scheduled, quiet whole room warmth, the Radia S is one of the most thoughtful heaters I have tested. You can check the current DeLonghi Radia S price on Amazon when you are ready.
How We Test
I ran the Radia S for a full month as the primary heat source for a home office, using the digital timer on a daily schedule and the ECO mode in the evenings. I logged warm up times, checked how steadily the thermostat held temperature, and monitored the power draw to verify the ECO savings.
I also tested the timer against power interruptions, moved the unit between rooms to check portability, and verified the safety functions. Independent category context from sources such as CNET best space heater coverage helped me compare the Radia S against the wider market before I settled on my verdict.
The DeLonghi Radia S listing on Amazon shows the current price and available configurations.
Questions People Ask
How does the ECO energy saving mode work?
ECO mode keeps the thermostat at a gentle level that maintains comfort while drawing less power, which trims consumption during long running periods.
Can the digital timer run a schedule across a week?
The timer programs 24 hour cycles for the day, so it is best for repeating daily schedules rather than separate weekend and weekday plans.
Does the Radia S heat a whole room or just the area beside it?
The oil filled design heats the air in the whole room slowly and evenly, so a mid sized room reaches a uniform temperature rather than a hot spot.
Is the Radia S safe to leave running while I sleep?
Yes, it combines overheat protection, a tip over switch, and a surface that stays moderate to the touch, which makes it suitable for overnight use.
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