- Type
- Oil-filled radiant heater, no fan, 6 fins
- Wattage
- 1500 W max, 700 W min, 3 power settings
- Coverage
- 23.2 sq. ft. (De'Longhi's own spec sheet, listed as 'working capacity')
- Thermostat
- Mechanical temperature and power dial with a programmable 24-hour timer
- Safety features
- Thermal cut-off, fully enclosed heating elements, rounded corners
- Dimensions
- 16.4 in. x 10.3 in. x 26.1 in.
- Weight
- 24.03 lb
- Warranty
- Full manufacturer warranty (De'Longhi does not state the number of years on its product page)
De'Longhi
De'Longhi TRD40615T
An oil-filled radiator that heats by radiant warmth with no fan, for a room where quiet, steady heat matters more than a fast warm-up.
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All prices
| Store | Price | Checked | |
|---|---|---|---|
| De'Longhi Best price | $159.95 | ✓ AUG 30 | Go to store |
Prices were checked on the dates shown and can change at any time. The store page is always authoritative. Shipping and taxes are not included.
First verified Aug 30, 2026. When a later check finds a different price, it gets logged here.
Our verdict
Where it wins
- No fan means no moving-air noise and nothing stirring up dust while it runs
- Sealed oil reservoir never needs refilling or maintenance over the life of the heater
- Programmable 24-hour timer lets the room warm up before you walk in
- Keeps releasing heat for a while after it shuts off, since the oil holds warmth
Where it loses
- De'Longhi's own spec sheet lists a working capacity of just 23.2 sq. ft., smaller than the other heaters in this guide
- Oil radiators are slower to warm up than a fan-driven ceramic or infrared heater because the oil itself has to heat first
- At 24 lb it is the heaviest heater here, which makes it awkward to move between rooms despite the caster wheels
The TRD40615T trades speed for quiet. There is no fan, so the only sound is the occasional tick of the metal casing as it expands, and De'Longhi says the sealed oil reservoir never needs topping up. That makes it a reasonable pick for a bedroom where fan noise is the dealbreaker, as long as you turn it on well before you need the heat rather than expecting an instant change in room temperature. It is not a space saver: at 24 lb and a spec sheet coverage figure well under 100 sq. ft., it is built for a small room close to the unit rather than an open area. Skip it if you want to feel warm air moving, or if you want a heater that can double as a fan in summer, since this one only radiates.
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More on the De'Longhi TRD40615T
Common questions
Does the De'Longhi TRD40615T have a fan?
No. It heats by radiant warmth from an internal oil reservoir, and De'Longhi markets that as an advantage for allergy sufferers since there is no fan to stir up dust.
How long does it take to warm up a room?
De'Longhi does not publish a warm-up time on its product page. Oil-filled radiators generally take longer to reach full heat than fan-driven ceramic or infrared heaters because the oil itself has to heat first.
Is the oil reservoir refillable?
No. De'Longhi describes it as permanently sealed, so there is nothing to refill or maintain over the life of the heater.
Is an oil radiator cheaper to run than a fan heater of the same wattage?
No. A 1500 W radiator and a 1500 W fan heater draw the same power and produce roughly the same total heat over time; the oil just releases that heat more slowly and evenly, and keeps radiating for a while after it switches off.
Prices last verified Aug 30, 2026.