DeLonghi EW7707CM vs Dragon4 TRD40615E: both are 1500W oil-filled radiators designed for quiet, steady room heat. The EW7707CM is the simpler mechanical model with three power settings and DeLonghi’s ComfortTemp control. The Dragon4 TRD40615E adds digital programmable controls and a more advanced timer-driven ownership experience.
For buyers who want dependable heat with fewer electronics, EW7707CM is easier to recommend. For people who will actually use schedules and digital temperature control, Dragon4 is the more capable heater. The main 2026 caveat is availability: DeLonghi’s current US catalog emphasizes newer Dragon models, while TRD40615E remains in the support library.
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Quick Verdict
Buy EW7707CM for mechanical controls, three heat settings and lower complexity. Buy Dragon4 TRD40615E if you specifically want digital programming and can find legitimate current stock at a sensible price. Do not overpay for the older Dragon4 simply because it has more buttons.
EW7707CM vs Dragon4 Comparison
| Heater type | Both: oil-filled electric radiator |
| Maximum input | Both 1500W |
| Controls | EW7707CM: mechanical; Dragon4: digital programmable |
| Power settings | EW7707CM: 3; Dragon4: programmable digital control |
| Temperature management | EW7707CM: thermostat + ComfortTemp; Dragon4: digital thermostat/ECO-style control |
| Fan | Neither uses a room-air fan |
| Mobility | Both use caster-style portability |
| Current status | EW7707CM actively sold by DeLonghi US; TRD40615E appears mainly in support pages while newer Dragon models are promoted |
Why the EW7707CM Is the Better Simple Radiator
The EW7707CM does the basic radiator job well: 1500W maximum heat, three settings, adjustable thermostat, anti-freeze setting and thermal cutoff protection. DeLonghi’s ComfortTemp mode is designed to maintain a comfortable level without leaving the heater at maximum thermostat setting.
Read our DeLonghi EW7707CM review for more detail.
Why Dragon4 Is More Capable
Dragon4 adds a digital interface and programmable operation, which is useful if you want the radiator to follow a schedule instead of simply cycling around a thermostat dial. Its larger control system is the main reason to choose it; both heaters still rely on the same basic 1500W resistance-heating ceiling.
Our Dragon4 TRD40615E review covers the model-specific details and current-market context.
Which Is More Energy Efficient?
At the heating element, both convert electrical input into heat. Practical energy use depends on how long each heater runs and how well its controls prevent unnecessary runtime. Digital scheduling can help if you use it correctly, while ComfortTemp can help avoid running the EW7707CM at an unnecessarily high setting. Neither model creates “extra” heat from the same electricity.
Safety and Maintenance
- The internal oil is permanently sealed and does not need routine refilling.
- Keep the radiator upright and follow the manual before moving or storing it.
- Use the built-in wheels rather than dragging a hot radiator by the cord.
- Plug directly into a suitable wall outlet and keep combustible materials clear.
Frequently Asked Questions
Are both models 1500W?
Yes. DeLonghi documentation lists 1500W input for the EW7707CM and Dragon4 family.
Which has digital controls?
Dragon4 TRD40615E. The EW7707CM uses mechanical controls.
Does the EW7707CM have a timer?
Its main current US product positioning is mechanical control and ComfortTemp, not a programmable digital timer.
Is Dragon4 TRD40615E still current?
DeLonghi still hosts support material, but its current US radiator catalog highlights newer Dragon models. Availability can therefore vary.
Which is quieter?
Both are oil-filled radiators without a room-air fan, so both are very quiet in normal operation.
Conclusion
EW7707CM is the better buy for most people because it remains easy to find, simple to operate and well suited to quiet supplemental heat. Dragon4 TRD40615E is more attractive only when you specifically want digital programming and can find trustworthy stock. Check DeLonghi’s current EW7707CM page and Dragon4 support page for current documentation.
