![]() Unless you particularly need the fast heating functionality, the DeLonghi Radia S Eco models are a great option and come in $20 to $50 cheaper than the Dragon 4. ![]() DeLonghi TRD40615E Dragon 4 Oil filled radiator review: also consider However, for $20 less, the Radia S Eco is probably good enough for more users. If you are looking for a reliable oil-filled radiator, the Dragon 4 is an excellent choice. If you really wanted to use this kind of heater with a timer, you could always add a smart plug, that way you can easily schedule it to turn on or off as often as you like. There's nothing that this model is lacking and the only more advanced model in the range (the Dragon 4 Pro) simply adds a more effective timer. This design not only looks more stylish but it does heat the room faster. (Image credit: Future) DeLonghi TRD40615E Dragon 4 Oil filled radiator review: verdictįeature-wise, the Dragon 4 is very similar to the DeLonghi Radia S Eco, with the exception being the chimney fin panel design. The larger panels and chimney design certainly suggest the Dragon 4 is the more powerful of the two and it certainly had no problem covering my 160 sq ft room. The actual coverage that is offered by the radiator isn't immediately clear as the website suggests use for rooms up to 145 sq ft, which is considerably less than the 250 sq ft provided by the smaller and cheaper DeLonghi Radia S Eco model. As the heat isn't directional, it takes a while to feel the benefit, but you can feel the heat coming out of the top of the radiator if you hold your hands over it. The Dragon 4 did what no fan heater seemed to be capable of, and that was to properly heat my entire office, even when it was approaching 0✯ outside. If you set the thermostat to a lower temperature there is a quiet click when it reaches temperature and when it resumes heating but you'd only hear it if you were sat in silence. After that, the radiator is completely silent. In the DeLonghi Dragon 4 these are only noticeable in the first couple of minutes of turning the device on. There's no fan noise with an oil-filled radiator but that is an audible pop and crackle as the oil first heats. (Image credit: Future) DeLonghi TRD40615E Dragon 4 Oil filled radiator review: performance There are also grab handles on both ends of the unit to pick it up if needed. The radiator is mounted on four caster wheels that rotate to allow for easy movement in any direction. There's also an anti-freeze function that activates when the thermostat is set to 41✯ and will only turn on when the room drops below this temperature. The Eco function will automatically change the power level to provide more economical heating. The timer, like those on many heaters, only allows you to set a time to turn it off rather than to turn it on, but it does provide a 24-hour range in 30 segments. The screen provides the thermostat temperature – that it's set to rather than the current temp – as well as icons for the power level (min, med, max), heating status, power, timer and lock functions. A larger Eco button sits below these and an LCD screen sits above. The controls are all on the front end of the radiator and comprise six main buttons for the thermostat, power level, timer, dimmer and on/off. The top also has five large openings to allow the warm air to rise. The idea is that the central core heats these tubes and the heat rises quickly out of the top as well as out of the sides, to warm the room faster. These are actually triangular tubes mounted vertically and create a chimney effect. Rather than the usual fin-like design, the sides of the Dragon 4 are flat strips. This is still compact enough to sit next to my office chair but a little too tall to fit under a desk – plus with the heat radiating from the top, that probably isn't advised anyway. The DeLonghi Dragon 4 is larger than many of the basic six or seven fin oil-filled models, measuring around 14 inches long, 6.5 inches wide and standing around 25.5 inches tall. (Image credit: Future) DeLonghi TRD40615E Dragon 4 Oil filled radiator review: design and features
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