Best overall in space heaters
An oil-filled radiator for quiet, steady background heat through a cold snap, with an anti-freeze setting, a 24-hour timer and a thermal cut-off. No tip-over switch is listed for this white US model.
Our score: 7.6/10 out of 10Researched, not lab-tested
- Heater type
- Oil-filled radiator
- Maximum heat
- 1,500 W
- Heat settings
- 3
- Weight
- 25.61 lb
Is it right for you?
Pros
- Three power settings, 700 to 1,500 W
- Anti-freeze function and adjustable room thermostat
- Thermal cut-off, safety thermostat and child lock
- 24-hour timer and ECO function on a digital panel
- Sealed oil reservoir: nothing to refill
Cons
- No tip-over switch listed (the black TRD40615EBK-6A has one)
- Heavy at about 25.6 lb, though it rolls on castors
- De'Longhi says it suits well-insulated rooms or occasional use
- Manual unreadable for us, so clearances and warranty term are unconfirmed
- Best for
- Keeping a bedroom, home office or chilly room warm through a long cold snap in the US, where quiet, steady heat matters more than speed.
- Not for
- Canadian buyers (the Canadian model is the TRD40615ECA), quick spot heating, or anyone who wants a stated tip-over switch.
Our verdict
For background heat through a deep cold snap, an oil-filled radiator is the calm choice: no fan, just six oil-filled fins that warm up and stay warm. De’Longhi’s US Dragon runs at 700 to 1,500 W across three settings on a standard 120 V outlet, with a digital panel, an adjustable room thermostat, a 24-hour timer, an ECO function and an anti-freeze function. The oil reservoir is sealed for life.
De’Longhi lists a thermal cut-off, a safety thermostat and a child lock, but no tip-over switch for this white model; the black TRD40615EBK-6A is the version it sells with one. Follow the clearances in the manual in the box. It weighs about 25.6 lb on castors, and De’Longhi says it suits well-insulated rooms or occasional use. For a heater with a stated tip-over switch, see the Lasko CT22850; the Canadian version is the TRD40615ECA.
Using it safely in a cold snap
Safety: keep 3 ft (0.9 m) clear around the heater, stand it on a stable floor, plug it straight into a wall outlet (never a power strip or extension cord), keep the cord out from under rugs, and don’t leave it running unattended or while you sleep. CPSC space heater tips. In Canada, Health Canada treats portable heaters that fail the CSA safety criteria as a danger, so check the label for a recognised certification mark.
A space heater warms one room; it doesn’t protect pipes in the rest of the house. Our guide on keeping pipes from freezing in an outage covers what to do when the furnace stops, and the space heaters we compare are side by side on the hub.
Specs
De’Longhi Dragon Full Room Digital Radiant Heater (TRD40615E-6A)
Heating
| Heater type | Oil-filled radiator |
|---|---|
| Maximum heat | 1,500 W |
| Heat settings | 3 |
| Anti-freeze mode | Yes |
| Built-in thermostat | Yes |
Safety
| Tip-over switch | No |
|---|---|
| Overheat shut-off | Yes |
Other details
| Weight | 25.61 lb |
|---|
Maker’s figures, checked 3 Nov 2026.
De'Longhi TRD40615E questions
Does the De'Longhi Dragon have frost protection?
Yes. De’Longhi lists an anti-freeze function for the TRD40615E-6A alongside its adjustable room thermostat.
Does the white De'Longhi Dragon have a tip-over switch?
De’Longhi doesn’t list one for the white TRD40615E-6A. The black TRD40615EBK-6A is the version it sells as having a tip-over switch (TOS).
Does an oil-filled radiator need refilling?
No. De’Longhi says the oil reservoir is permanently sealed and never needs refilling.