4 Best Delonghi 1500w Oil Column Heater of 2026 For Silent Whole-Room Warmth

1

De'Longhi Oil filled Radiator Heater, 1500W Electric Space Heater for

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  8.9
• Brand
  De'Longhi

Key specs2

Thermostat Interface

Simple turn dials control power and temperature, paired with a ComfortTemp switch that automatically balances output without requiring digital menus.

Chassis Depth

5.9 inches deep for narrow floor spaces

Pros & cons42

Pros

• Simple dial controls and ComfortTemp switch maintain target warmth without complex digital programming
• Thermal slot design directs rising heat outward while keeping surface temperatures low
• Slim 5.9-inch depth takes up minimal floor space along bedroom and home office walls
• Fanless radiant heating operates silently without circulating dust or airborne allergens

Cons

• Lacks a programmable 24-hour timer to schedule automatic heating cycles ahead of time
• Manual control dials do not provide a digital temperature readout or a child lock feature

2

DeLonghi Radia S Oil-Filled Radiator Space Heater, Full Room Quiet

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  8.9
• Brand
  De'Longhi

Key specs2

Chassis Depth

6.0 inches deep for easy placement in tight rooms

Safety Protections

• Child lock to prevent accidental control changes
• Thermal cut-off safety switch for overheat protection
• Anti-freeze mode that activates in freezing conditions

Pros & cons42

Pros

• Digital LED control panel provides precise power adjustments and a built-in 24-hour timer
• Dedicated safety protections include a child lock setting and thermal cut-off switch
• Anti-freeze setting automatically turns on to help prevent freezing pipes in cold rooms
• Lightest unit in the lineup at 22.33 pounds with a compact 6-inch chassis depth

Cons

• Exposed-fin design lacks the enclosed chimney airflow of Dragon series models
• Light gray exterior is the only available color option for this specific model

3

DeLonghi Dragon Digital Oil Filled Radiator Heater, 1500W Electric Space

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  8.8
• Brand
  De'Longhi

Key specs2

Convection Technology

Enclosed battery chimney design accelerates rising warm air through top thermal vents, transferring heat into the room faster than standard exposed fins.

Cabinet Footprint

• 16 inches wide by 10 inches deep by 26 inches high
• Weight of 26.6 pounds requires dedicated floor room
• Requires greater wall clearance than 6-inch slim units

Pros & cons43

Pros

• Enclosed Dragon chimney design provides 75 percent more radiant surface area than Radia S
• Accelerated convective airflow warms the surrounding room faster than exposed fins
• Digital LED display enables 24-hour timer programming and flexible heat selection
• Modern black exterior provides a sleek look that matches darker room decor

Cons

• Wide 10-inch body depth takes up significantly more floor clearance than slim models
• Weighs 26.6 pounds, making carrying up stairs heavier than the lighter Radia S
• Listing does not mention a child lock feature for the digital control panel

4

De'Longhi Dragon Digital Oil Filled Radiator Heater, 1500W Electric Space

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  8.4
• Brand
  De'Longhi

Key specs2

Convection Technology

Unique chimney styling channels airflow internally for enhanced convection, delivering rapid whole-room warmth while retaining silent oil heat.

Timer & Scheduling

Digital control console includes a programmable 24-hour timer to set operating intervals and avoid running the 1500W heater unnecessarily.

Pros & cons43

Pros

• Patented chimney battery design yields 75 percent more radiant surface area than Radia S
• Faster convective circulation disperses heat into the room without noisy fans
• Digital control panel with LED screen allows simple 24-hour run-time scheduling
• Neutral white casing blends cleanly with standard household baseboards and trim

Cons

• Bulky 10-inch frame requires four extra inches of floor depth compared to Radia S
• Heavy 26.6-pound build demands more effort to relocate across different floors
• Does not specify a dedicated child lock function on the digital console

Last update on 2026-10-26 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does the De'Longhi Dragon heat a room faster than the Radia S?

Yes, the Dragon design distributes radiant heat faster because it features 75 percent more radiant surface area than the Radia S. Both models draw 1500W of electrical power, but the Dragon TRD40615 series channels convection through thermal chimney slots rather than relying solely on open external fins. This extra surface area transfers warmth into the room air more rapidly while maintaining silent operation.

Which De'Longhi 1500W oil column heater includes a 24-hour digital timer?

Both the Radia S and the Dragon TRD40615 models feature an integrated 24-hour digital timer managed through an LED display panel. This digital control setup allows you to program specific operating cycles without external timer plugs. In contrast, the EW770 uses simple manual turn dials to manage temperature and power levels, making it better suited for users who prefer mechanical controls over scheduled digital programming.

How much floor space and depth does each radiator require?

Chassis depth varies significantly, ranging from 5.9 inches on slim models up to 10 inches on enclosed chimney frames. The De'Longhi EW770 has a slim profile measuring 5.9 inches deep by 13.78 inches wide, and the Radia S measures 6 inches deep by 15 inches wide. The Dragon TRD40615E and TRD40615EBK models require a larger footprint of 10 inches deep by 16 inches wide. If you are placing a radiator along a narrow hallway or between tight bedroom furniture, checking clearance against a space heater for small apartment layout helps prevent blocked walkways.

How does the ComfortTemp feature work on manual dial models?

ComfortTemp is an energy-saving setting on the EW770 that automatically maintains optimal room temperature and power levels at the press of a button. The manufacturer notes that deploying this mode can be up to 20 percent more efficient compared to running the unit with its manual thermostat turned to maximum. It allows you to maintain steady comfort without manually dialing heat levels up and down throughout the day.

Are De'Longhi oil column heaters suitable for bedrooms and allergy sufferers?

Yes, these sealed oil radiators are well suited for sleeping spaces because they heat through natural convection rather than a motorized fan. The Radia S specifically promotes a better breathing environment by warming gently without blowing dry air or circulating household dust, pollen, and pet dander. Silent radiator operation reflects practical innovations in electric heaters built for undisturbed sleep.

How heavy are these 1500W oil column heaters when moving them between rooms?

De'Longhi 1500W column radiators weigh between 22.33 pounds and 26.6 pounds depending on the exterior casing. The Radia S is the lightest unit at 22.33 pounds, followed by the EW770 at 23.15 pounds. The Dragon TRD40615 models weigh 26.6 pounds due to the added metal forming their enclosed chimney structure. All of these models feature pre-assembled folding caster wheels to help roll the unit across smooth flooring instead of carrying it.