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Electric space heaters04 of 7 heatersSilent, for bedrooms

De'Longhi · TRD40615T

De'Longhi TRD40615T Oil-Filled Radiator

A sealed oil-filled radiator with no fan at all: silent, slow, and the safest thing to leave running in a bedroom overnight.

Check price on Amazon Spec sheet

Amazon link · we earn a commission if you buy · $160 MSRP · Amazon price not shown · verified Sep 25, 2026

Why it scores 7.5

Reliability8.5
Performance7.5
Usability6.5
Value7.0
Support7.0

Reliability 30% · Performance 25% · Usability 20% · Value 15% · Support 10%. Bars run from 5 to 10.

Known issue · Oil smell on the first day, a thermostat dial marked 1 to 6 with no degrees, and 25 lb that discourages moving it room to roomHome Depot reviews

Built from 3 sources: 1 owner thread, 2 spec pages.

Take it home if

  • Silent; no fan, no blower whine
  • Sealed for life, never needs refilling
  • 24-hour timer and three power settings

Walk past if

  • Twenty-five pounds; the wheels help but it stays where you put it
  • Thermostat dial is marked 1 to 6, not degrees
  • Oil smell for the first day of use

Spec sheet

Manufacturer ratings, not our measurements.

Heat output
1500 W, 3 settings
Coverage
Mid-size room, slow warm-up
Controls
Dial thermostat 1 to 6, 24 h programmable timer
Weight
25 lb
Safety
Thermal cut-off, tip-over switch, sealed oil
Warranty
1 year, plus 1 year with registration

Alternatives

The nearest in its class, then the nearest rival among heaters.