DeLonghi Dragon Digital (TRD40615E / TRD40615EBK): problems, parts and running costs

Checked: 2026-10-17

Summary

The Dragon Digital is a 1500 W, six-fin oil-filled radiator that is silent and holds heat for hours after shutdown, but it warms a room slowly and its surfaces get hot enough to burn. It has no consumables, so electricity is the whole running cost, about $1.55 for an eight-hour workday at average US rates and roughly $135 a month if it runs 12 hours a day at $0.25 per kWh without cycling. It is a good buy around or below $170 and poor value above $190.

Common problems and fixes

Slow warm-up — Wirecutter found it can take a half-hour or more before you feel warmth and an hour may only raise the room a few degrees; pre-heat the room, use ECO mode, or pick a fan-forced ceramic heater if you need a room warm in ten minutes. [5][7][9][8]
Hot surfaces — Wirecutter measured the case at 180 °F and the interior fins at 230 °F after four hours, and Consumer Reports warns the exhaust outlet can cause pain or burn; keep it away from children, pets and laundry. [5][9][7]
First-use smell and creaking — run the unit at maximum power for two hours with thorough ventilation to clear the new smell, and expect creaking as the oil heats, which the manual calls normal. [12][5]
Pops and clicks on heat-up — T3 reports an audible pop and crackle as the oil first heats, and a quiet click when the thermostat reaches temperature; this is thermal expansion, not a fault. [8][12]
Tip-over protection is disputed — DeLonghi does not list it and Consumer Reports records none on the near-identical sibling, though WIRED lists a 45-degree trigger; do not assume it is there. [1][9][7]
Timer and display confusion — the manual documents both a delayed start and a delayed stop, but the display shows the set temperature rather than the measured room temperature, so some owners think the timer cannot turn the unit on. [3][4][8]
Short stock cord and high load — one buyer found the supplied cord too short, and a 1500 W unit at 120 V is a 12.5 A load, so do not use an extension cord or share a power strip. [14][5]

Parts and consumables

No replaceable parts or consumables reported. The oil is permanently sealed and never needs refilling; maintenance is limited to dusting between the fins with the unit unplugged. [1][3][4]

Yearly running cost

There are no consumables: no filters, no fluid, no batteries and no remote, so electricity is the whole bill. Wirecutter puts a typical 1500 W heater at just under $1.55 for an eight-hour workday at average US electric rates. A Reddit calculation for 12 hours a day at $0.25 per kWh comes to about $135 a month if the heater never cycles; ECO mode exists to make it cycle instead. A 1500 W unit at 120 V is a 12.5 A load, so it should not share a power strip. [5][13][1][14]

When it is a good buy

DeLonghi sells the white TRD40615E-6A at $189.95 and the analog TRD40615T-6A at $159.95, and Lowe’s lists the related TRDR40615EL at $169.00. The research calls at or below $130 strong value, $131 to $170 fair to good, $171 to $189 the standard shelf price, and above $190 poor value. [1][15]

Fan-forced ceramic heater — about $80 to $100, and the better tool when you need a room warm within ten minutes. [5]