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Oil filled radiator buying guide UK

Updated: 22 October 2026

You landed on an oil filled radiator buying guide UK because search results mix plumbed central-heating radiators with plug-in oil columns and fan heaters. Here we mean portable electric radiators: sealed oil-filled fins, or Dimplex-style oil-free panels you roll into a room on castors. The [radiator comparison](/hub/heating/radiator) lists eleven current amazon.co.uk listings with wattage, timers, smart control and review counts. This page walks sizing, controls, safety and price bands so you can shortlist before you fix on one model. Peter F. checked those listings and public UK sources. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.

You landed on an oil filled radiator buying guide UK because search results mix plumbed central-heating radiators with plug-in oil columns and fan heaters.

Our top picks

De'Longhi De'Longhi Dragon 4 TRD40820T

Best overall

De'Longhi De'Longhi Dragon 4 TRD40820T
8.7/10about £149
View offer
Pro Breeze Pro Breeze PB-H 2500 W

Rank 2

Pro Breeze Pro Breeze PB-H 2500 W
9.0/10about £79.99
View offer
Russell Hobbs Russell Hobbs RHOFR5001B

Rank 3

Russell Hobbs Russell Hobbs RHOFR5001B
9.0/10about £42.95
View offer
On this page
  1. 1.Who a portable radiator is for
  2. 2.Wattage and room size
  3. 3.Controls, timers and smart features
  4. 4.Safety and running cost

Who a portable radiator is for

A portable oil or oil-free radiator suits supplementary heat: a bedroom that never gets warm when the rest of the house is comfortable, a home office during boiler downtime, or a conservatory you want to use in January without firing the whole system. It is not a replacement for a properly sized central-heating upgrade in a poorly insulated Victorian terrace, and it will not heat every room on one 13 A socket. If you already know you want Dimplex dry-element technology rather than classic oil, read oil filled vs oil free radiator first, then come back for watts and sockets.

Wattage and room size

Seller coverage runs from 700 W on the Dimplex Eco Chico, through 1,500 W on the Russell Hobbs seven-fin, up to 2,000–2,500 W on most oil columns. Claims of 15–32 m², or a cubic-metre line, are hints, not a heat-loss calculation. About 100 W per square metre is a practical UK starting point, toward 125 W/m² in a draughty room. A 12 m² spare room sits near 1.2–1.5 kW in theory. Sellers still ship 2 kW, and the thermostat cycles down on a mild evening. Choose 2.5 kW when a long or north-facing room stayed cold on 2 kW. Fin count changes feel, not the fuse rating.
De'Longhi De'Longhi Dragon 4 TRD40820T

Testsieger

De'Longhi De'Longhi Dragon 4 TRD40820T
8.7/10about £149
View offer

Controls, timers and smart features

Commission Regulation (EU) 2015/1188, still on many UK boxes as Lot 20 ecodesign for local space heaters, pushes a thermostat, a timer and open-window logic where it is fitted. The radiator still pulls its rated power when the element is on. Savings come from cycling and from the hours you actually run. The Russell Hobbs title shows no timer. NETTA, Pro Breeze, Devola and Dreo list 24-hour programmes. De'Longhi is mechanical or electronic. Pay for a timer if you pre-warm a home office before 9 a.m. or cut the heat when you leave. A plug-in timer on 1.5 kW can work if you follow Electrical Safety First guidance on the load. Wi-Fi on Pro Breeze and Dreo adds a phone schedule, with mixed reviews on pairing and eco mode. Pay for it only if you will use the schedules.

Safety and running cost

Electrical Safety First treats these as high-load appliances. Use a level surface, keep bedding, curtains and clothes away, do not cover the unit, and avoid an extension lead for a sustained 2–2.5 kW draw. These listings do not allow one. Portable oil columns here are not bathroom heaters unless a clear IP rating and an install guide say so. De'Longhi manuals in the category ban bathroom use. At 26.32 pence per kWh, the Ofgem illustration for Direct Debit in Great Britain from 1 October to 31 December 2026, one full hour at 2,000 W is about 52.6 pence before the thermostat shortens the run. Oil-filled and oil-free at the same wattage and on-time cost the same.

Common questions

What wattage do I need for a bedroom?
Many UK doubles sit around 12–18 m², where 1.5–2 kW is the usual plug-in range. A 1.5 kW Russell Hobbs matches a small room. A 2 kW column suits a typical double if insulation is average. A 700 W Eco Chico is a box room or a top-up, not primary heat in a large double. Placement and overnight limits are on oil filled radiator bedroom.
Are 11 fins better than 7?
More fins spread the surface at a given wattage, which can feel gentler and can help residual warmth. A 7-fin 1.5 kW column cannot become 2.5 kW by fin count. Compare the nameplate first, then the layout. Chimney-effect fins change airflow through the column. They do not change the fuse rating or the pence per hour at full power.
Do I need a 24-hour timer?
Not strictly. A timer stops you paying for hours you are out. A built-in timer is cleaner than daisy-chaining a cheap plug timer onto 2.5 kW if you use a daily schedule. If the saved title has no timer, confirm the live amazon.co.uk card before you plan a morning pre-warm. The programming steps for a first cycle sit on how to use an oil filled radiator.
Is a smart app worth it?
Only if you will set schedules or use voice control. A non-smart De'Longhi or NETTA heats the room without 2.4 GHz pairing. Reviews in this set mention app drop-outs and, on the Dreo, an eco reading that does not match the room. Treat the app as a bonus. Tip-over protection, and a clear gap from curtains and bedding, still sit on the heater itself.
Oil-filled or oil-free for a home office?
An oil-free Dimplex warms quickly and avoids oil-leak anxiety, which suits a short meeting. An oil-filled column holds heat after switch-off, which suits a long call once the room is already warm. At the same wattage and the same on-time, the meter does not care which label is on the box. Pick the failure mode you can live with, then match the kilowatts to the study.

Related pages

Best oil filled radiator UK

Radiator

Oil filled radiator bedroom: watts, timer, overnight

How to use an oil filled radiator safely in the UK

Oil filled vs oil free radiator: heat, leaks, cost

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these eleven listings were taken from the listing files read on 20 October 2026. Page updated October 2026.

  1. Electrical Safety First — portable heaters (retrieved 20 October 2026)
  2. Devon and Somerset Fire and Rescue — heater safety (retrieved 20 October 2026)
  3. BS EN 60335-2-30 scope (retrieved 20 October 2026)
  4. legislation.gov.uk Annex II 2015/1188 (retrieved 20 October 2026)
  5. GOV.UK ecodesign guidance (retrieved 20 October 2026)
  6. Ofgem price cap 1 October to 31 December 2026 (retrieved 20 October 2026)
  7. Centre for Sustainable Energy — room heaters (retrieved 20 October 2026)
  8. De'Longhi GB Dragon TRD40820T (retrieved 20 October 2026)