Space heaters divide the world into two camps. Some rooms need a blast of hot air the moment you walk in, and others need a warmth that can sit with you for hours without the whine of a fan or the flicker of a glowing element. The DeLonghi Oil Filled Radiant Heater, model TRH0715, belongs firmly in the second camp. It is a 1500 watt unit that uses heated oil inside metal fins to radiate warmth slowly and steadily, With an anti freeze function and a set of safety features that make it a fixture of bedrooms and offices. This review covers my weeks with the heater through cold mornings and long evenings, and whether it earns its place on your floor.
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 TRH0715 is a column style radiator with seven oil filled fins, and the design has barely changed in decades because it works. The fins are made of pressed steel, welded shut, and permanently sealed with the oil that carries the heat. Because the oil never needs to be refilled, the heater requires no maintenance beyond keeping the exterior clean.
The fins themselves are ribbed for a larger surface area, which helps the unit transfer heat into the room efficiently, and the gaps between them let warm air rise naturally and circulate. It is a simple convection and radiation approach, but it is exactly what makes the heat feel so even compared to a forced air fan.
The controls live on a small panel at the top of the unit, with a rotary power dial that selects the heat setting and a second dial for the thermostat. Two wheels at the base allow the heater to roll around the room, and the whole unit is light enough to move from a bedroom to an office without complaint. A carry handle on top makes lifting it feel natural, and there is even cord storage on the rear so the cable tucks away when the heater is stored for the season.
Nothing about the build feels premium, but nothing feels fragile either. The heater is a utilitarian appliance with honest plastic and steel, and in several weeks of daily use, including being rolled across floors and bumped by feet, it showed no rattles, no loose panels, and no signs of wear.
Key Features
The defining feature is the oil filled radiant design itself. Instead of blowing air across a hot element like a ceramic fan heater, the TRH0715 warms oil that then radiates heat from the surface of the fins. The result is a heat source that never dries the air aggressively, never produces dust or odor, and operates in near total silence.
The power dial offers three heat settings, typically around 700 and 1500 watts, so you can run the heater on a gentler setting for background warmth or at full power to chase the chill from a room quickly. The adjustable thermostat then cycles the element on and off to hold the temperature you choose, rather than simply blasting heat until the room becomes unbearable.
The anti freeze function is a standout for anyone with a garage, cabin, or workshop. Set the dial to the anti freeze position and the heater keeps the space above freezing, which protects pipes and plants from cold damage without running the heater at full power all day. The safety package includes overheat protection and a tip over switch that cuts power if the unit falls, along with a surface that stays warm to the touch but well below the burn risk of exposed heating elements.
Real-World Performance
I placed the TRH0715 in a mid sized home office and let it run through several cold mornings. The first thing that stood out was the silence. With the fanless design, the only sound was the soft click of the thermostat as it cycled, which is a profound change from the constant hum of a fan heater and a genuine benefit for a room where people sleep or concentrate.
The thermostat behaved predictably once I found the right setting. The dial uses a simple numbered scale rather than exact temperatures, so the first evening involved a bit of trial and error, but after that the heater held a comfortable steady level on its own. That kind of predictable behavior is what makes the unit easy to trust in a bedroom overnight.
Heating is not instant. Oil Filled Radiators work slowly, building warmth over twenty to thirty minutes rather than blasting heat in ninety seconds, and that is the honest trade off for the even, comfortable heat they deliver. Once the room reached temperature, the thermostat held it steadily, with fewer of the hot and cold swings I have experienced with fan heaters that overshoot and then shut off completely.
The warmth itself is the most pleasant part. The radiant heat feels like sitting near a radiator in an old house, gentle and enveloping rather than harsh and blasting, and the air never felt dried out even after hours of running. The surface of the fins stays warm to the touch, which makes it safer around pets and children than exposed element heaters, and the anti freeze mode kept an unheated workshop above freezing through a cold spell exactly as intended.
Pros and Cons
Pros:
- Completely silent operation, ideal for bedrooms and offices
- Even, comfortable radiant heat without dry air
- Anti freeze mode protects garages and workshops
- Overheat protection and tip over safety switch
- Portable with wheels, carry handle, and cord storage
Cons:
- Slow to warm a room from cold
- Large footprint compared to compact fan heaters
- No remote control or digital timer on this model
How It Compares
The choice of space heater comes down to how you want to feel heat. The table below compares the TRH0715 with the other common heater types to make the difference concrete.
| Feature | Oil Filled Radiant | Ceramic Fan Heater | Infrared Heater |
|---|---|---|---|
| Warm up speed | Slow and steady | Very fast | Instant directional heat |
| Noise | Silent | Fan hum | Silent |
| Heat retention | Keeps radiating after shutoff | Cools quickly | Limited |
| Air dryness | Low | Moderate | Low |
| Best for | Whole quiet rooms | Quick spot heating | Heating a person or area |
If you need warmth in ninety seconds, a ceramic fan heater will beat the TRH0715 every time. If you need a room to stay comfortable for hours without noise and without the air turning dry and stuffy, the oil filled radiator is the better tool. For a bedroom, nursery, or office where the heater runs all day, the DeLonghi is the right kind of heat.
Who Should Buy It
Buy the DeLonghi TRH0715 if you want a heater that can run all night in a bedroom, all day in an office, or continuously in a workshop, because the silent, even heat and the safety features suit exactly those rooms. It is also the right choice if you dislike the dry, blasting air of fan heaters, or if you want the reassurance of the anti freeze mode protecting an unheated space.
Skip it if you need instant heat for a drafty room you will occupy for ten minutes, or if floor space is too precious for a seven fin radiator. If your needs lean toward a faster, more portable option, a ceramic heater fits that slot better. For steady, silent, whole room warmth, this heater is hard to beat. You can check the current DeLonghi heater price on Amazon when you are ready.
How We Test
I ran the TRH0715 in a home office and a bedroom over several weeks, covering both daytime work and overnight use. I logged warm up times, monitored how steadily the thermostat held temperature, and placed it on a hard floor with the wheels in motion to test stability and portability.
I also tested the anti freeze function in an unheated space during cold weather, and I checked the surface temperature of the fins and the behavior of the tip over switch. Independent testing context from sources such as Wirecutter space heater coverage helped me evaluate this unit against the category before I formed my own verdict.
The DeLonghi oil filled heater listing on Amazon shows the current price and available options.
Questions People Ask
Is the DeLonghi oil filled heater really silent?
Yes, the unit produces no fan noise, so it is effectively silent apart from the occasional click of the thermostat, which makes it a strong choice for bedrooms.
What does the anti freeze function do?
The anti freeze mode keeps the room above freezing with a minimum setting, which protects pipes and plants in garages or cabins during cold snaps.
How long does the heater stay warm after it turns off?
The oil retains heat well, so the radiator keeps radiating warmth for some time after the element cycles off, which smooths out the temperature swings.
Can I use the heater safely in a bedroom overnight?
Yes, the unit has overheat protection and a tip over switch, and because it stays cool to the touch on the surfaces you might bump, it is one of the safer heater types.
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