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5 best oil-filled radiators for large rooms in the UK

  • August 18, 2025
  • 11 minute read
Best oil filled radiator for large rooms
credit: Dreo
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Keeping a large room warm through the colder months can be a bit of a challenge, and that’s where oil filled radiators prove their worth. They’re reliable, steady with heat, and unlike fan heaters, they don’t dry out the air or create a sudden blast. Instead, they provide a more even warmth that lingers, making them a popular choice for bigger spaces. To help you choose the right one, we’ve looked at some of the best oil filled radiators designed for larger rooms. Here are the top options worth considering.

Exceptional

1. Dreo 2000W Oil Filled Radiator for Large Room

4.8 out of 5
  • Power output: 2000W
  • Heat modes: 800W / 1200W / 2000W + ECO
  • Safety: Tip-over & overheat protection
  • Timer: 24 hours
  • Display: Digital with thermostat
  • What We Like
  • Warms large spaces quickly with wide heat distribution.
  • Operates quietly, making it suitable for bedrooms or studies.
  • Adjustable temperature settings let you fine-tune heating needs.
  • Remote control provides effortless operation from across the room.
  • ECO mode maintains warmth while lowering energy use.
  • Strong build and multiple protections ensure reliable long-term safety.
View on Amazon.co.uk

Exceptional

2. De’Longhi Dragon 4 Oil Filled Radiator

4.7 out of 5
  • Power output: 2000W
  • Heat settings: 3 levels
  • Heating method: Convection with chimney effect
  • Timer: 24 hours mechanical
  • Safety: Anti-frost and overheat protection
  • What We Like
  • Unique chimney design pushes warm air faster through the room.
  • Large radiant surface area helps maintain steady, balanced warmth.
  • Mechanical timer allows simple daily scheduling without effort.
  • Smooth edges and design make it safe around children.
  • Easy-glide wheels allow quick movement between different rooms.
View on Amazon.co.uk

Exceptional

3. PureMate 2500W Oil Filled Radiator

4.6 out of 5
  • Power output: 2500W
  • Heat settings: 3 levels
  • Fins: 11 for wide heating
  • Timer: 24 hours
  • Safety: Tip-over and thermal cut-off protection
  • What We Like
  • Strong 2500W output quickly heats medium to large rooms.
  • Compact design fits easily in smaller living areas.
  • Timer lets you schedule heating around work or sleep.
  • Built-in safety features offer reassurance during extended use.
  • Portable build makes it simple to move across the house.
  • Suitable for consistent heating throughout colder months.
View on Amazon.co.uk

Exceptional

4. NETTA 2500W Oil Filled Radiator

4.6 out of 5
  • Power output: 2500W
  • Heat settings: 3 levels
  • Timer: 24 hours
  • Fins: 11 with castor wheels
  • Safety: Overheating and tip-over protection
  • What We Like
  • Heats rooms up to 28m² with steady, even warmth.
  • Adjustable thermostat helps maintain comfortable temperature easily.
  • Lightweight design with wheels makes it very easy to move.
  • Built-in cable tidy keeps storage neat and convenient.
  • Quiet performance ensures it doesn’t disturb daily activities.
  • Comes with warranty, giving extra peace of mind when buying.
View on Amazon.co.uk

Exceptional

5. Russell Hobbs 2500W Oil Filled Radiator

4.5 out of 5
  • Power output: 2500W
  • Heat settings: 3 modes (1kW, 1.5kW, 2.5kW)
  • Fins: 11 for heat distribution
  • Timer: 24 hours automatic
  • Safety: Overheat and tip-over protection
  • What We Like
  • Digital display shows settings clearly for easy adjustments.
  • Sleek white design blends well with modern home interiors.
  • Ideal for bedrooms, living rooms, and medium-sized offices.
  • Smooth castors make it simple to transport between rooms.
  • Two-year guarantee provides security and long-term reliability.
View on Amazon.co.uk

What size oil-filled radiator do I need for a large room?

The size of oil-filled radiator you need depends on both the dimensions of the room and how well it is insulated. As a general rule, you’ll need around 100 watts of heating power per square metre of floor space.

For example, a 20 m² room would need about 2,000 watts. Large rooms with high ceilings, poor insulation, or many windows may require a more powerful unit, sometimes in the range of 2,500 watts.

Are oil-filled radiators energy efficient for large rooms?

Oil-filled radiators are considered efficient because they retain heat well. The oil inside heats up and continues radiating warmth even after the power has switched off, which helps to reduce energy consumption compared to heaters that stop emitting heat immediately when turned off. 

How long does it take for an oil-filled radiator to heat a large room?

Heating time can vary depending on the size of the radiator, the starting room temperature, and the level of insulation. Generally, oil-filled radiators are not the fastest option, as they work by gradually warming the oil and then radiating heat. In a large room, it may take 10–20 minutes before you feel noticeable warmth.

However, this slower process is balanced by their ability to hold and release heat for longer periods, providing consistent warmth without frequent cycling on and off. If you want quicker results in a big room, you might pair the radiator with a fan heater for the initial warm-up, then rely on the oil-filled unit to maintain heat.

Do oil-filled radiators need maintenance?

Oil-filled radiators are virtually maintenance-free. The oil is sealed inside the unit for life and never needs topping up or replacing. All you need to do is keep the exterior clean and dust-free, as dust can reduce efficiency over time. Occasionally checking the power cable and plug for wear is also recommended, especially if the radiator is moved frequently. Unlike gas or fan heaters, there are no filters or burners to service, making them a very low-maintenance heating choice for large rooms.

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