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Convector heater vs oil filled radiator

Updated: 22 October 2026

You are looking at two portable heaters and wondering which will feel better on a cold evening. Convector heater vs oil filled radiator is two ways to turn electricity into room heat, not a brand fight. A convector warms air from an element and you feel that air sooner. An oil-filled radiator heats sealed oil, then releases warmth more slowly and keeps giving some heat after the element switches off. The [convector comparison](/hub/heating/convector) covers plug-in convectors and convection panels. Oil-filled models are not in that set. Peter F. checked amazon.co.uk listings and public UK sources. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.

You are looking at two portable heaters and wondering which will feel better on a cold evening. Convector heater vs oil filled radiator is two ways to turn electricity into room heat, not a brand fight.

Our top picks

Ballu Ballu NCA1-4.3EF-20 (2 kW)

Best overall

Ballu Ballu NCA1-4.3EF-20 (2 kW)
9.1/10about £149.99
View offer
BLACK+DECKER BLACK+DECKER BXCV41001GB (2.2 kW)

Best value

BLACK+DECKER BLACK+DECKER BXCV41001GB (2.2 kW)
8.8/10about £36.89
View offer
Daewoo Daewoo HEA1137 (2 kW turbo)

Rank 3

Daewoo Daewoo HEA1137 (2 kW turbo)
8.2/10about £32.99
View offer
On this page
  1. 1.What each heater is doing
  2. 2.Warm-up and leftover heat
  3. 3.Noise and dust
  4. 4.When the hourly price misleads
  5. 5.Which to choose

What each heater is doing

A convector heats air as it passes an electric element and rises. Most models in the convector set are fanless: Dimplex ML, HeatLite, BLACK+DECKER, Status, Russell Hobbs, Devola and Ballu. The Daewoo adds a turbo fan, which behaves more like a fan heater when that mode is on. An oil-filled radiator heats sealed oil inside metal fins. The oil stores heat and releases it through the surface. It is not a fuel, and nothing burns off in normal use. Neither type is central heating. Plug-in heat is supplementary. Controls on the convector side are on the convector buying guide.

Warm-up and leftover heat

Convectors feel faster because the element warms passing air immediately. You notice that air above the grille sooner than comfort in every corner. Switch off and the room cools quickly, because little heat is stored in the case. An oil-filled radiator warms the metal and oil first, so the first twenty minutes can feel slower. Once hot, the fins still radiate after the element cycles off. That leftover heat is why people choose oil-filled for a long sit. Thermostats on both types cycle, so neither runs at full power for every minute. A convector with a week programme, Devola’s periods or Ballu’s app still drops off faster after switch-off unless you leave it cycling while you stay in the room.
Ballu Ballu NCA1-4.3EF-20 (2 kW)

Testsieger

Ballu Ballu NCA1-4.3EF-20 (2 kW)
9.1/10about £149.99
View offer

Noise and dust

Fanless convectors are quiet next to the Daewoo turbo, which is the noisy option for a bedroom. Oil-filled radiators are typically silent aside from a tick as metal expands, unless you buy a hybrid with a fan. Both types move some air. Fan heaters move it fastest, and they stir more dust. Clean the grille and skip turbo mode if dust bothers you. A fan heater suits a few minutes in a dry room, and it is not in the convector table. For a longer evening, convector versus oil-filled is the split that matters.

When the hourly price misleads

At the same wattage and full output, the hourly cost matches. A 2 kW convector and a 2 kW oil-filled radiator on full power cost the same pence per hour, and a dearer 2 kW panel does not change that. A 1.5 kW oil-filled example looks cheaper because the heater is smaller, not because oil cuts the unit rate. Compare 2 kW with 2 kW. The cap multiplication, about 53p an hour at 2 kW full power from 1 October to 31 December 2026, is on convector running cost. A stated 800 W or 840 W step costs less only while that step is selected.

Which to choose

Choose a convector for faster air warm-up, a lighter unit to move between rooms, or a panel with a weekly timer. Devola and Ballu suit wall-adjacent convection. Dimplex ML suits a repeating schedule without oil weight. Heat fades soon after switch-off unless the thermostat keeps cycling while you stay. Choose an oil-filled radiator when you want warmth that lingers, and you can accept a slower start and heavier fins. A fan heater is for a short blast you can hear. The Daewoo turbo is only a partial example. Use a visible wall socket, no extension reel, and about one metre of clearance, and switch off when you leave or sleep. Setup is on how to use a convector heater.

Common questions

Which warms the room faster?
Convectors usually make you feel moving warm air sooner, because the element heats passing air straight away. An oil-filled radiator feels slower at first, while the oil and the fins take on heat, then steadier once that mass is warm.
Which stays warm after I switch it off?
An oil-filled radiator keeps radiating from hot fins. A convector loses perceived warmth faster once the element is off, because there is little stored heat in the case. That leftover warmth is the main reason to pick oil-filled for a long sit.
Which is quieter?
Fanless convectors and oil-filled radiators are both quiet. Oil-filled units may tick as the metal expands. Avoid turbo fan modes, including the Daewoo turbo in this set, if silence matters for a bedroom.
Which is cheaper per hour at the same wattage?
Neither. Match kilowatts and full-power hours. Compare 2 kW with 2 kW, not a 1.5 kW oil-filled radiator with a 2 kW convector. Resistive heat at the point of use does not favour one type on the unit rate.
Why do oil-filled hourly prices sometimes look lower?
Articles often use a smaller kilowatt oil-filled unit. The rate per kWh is the same. The heater draws fewer kilowatts, so the hour looks cheaper and you also get less heat. Do not paste older worked examples as today’s price cap.
Is a convector worse for dust?
Both move air gently compared with a fan heater. Regular cleaning of the room and the grille, and avoiding a turbo blow, matter more than the nameplate. Fan heaters move dust fastest.
Can I use either as my only heating?
Plug-in heat is supplementary for most UK homes. Rented and off-gas situations expect a proper system, not a row of portables, whichever type you prefer. A fan heater is the better third option only for a quick warm-up of a few minutes in a dry room.

Related pages

Oil radiator

Convector

Best convector heater UK: quiet, cheap or a timer

Convector heater buying guide: watts, timer, mount

How to use a convector heater: socket and clearance

Convector heater running cost at the 2026 price cap

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these nine listings were taken from the listing files, not a live check on 20 October 2026. Page updated October 2026.

  1. Ofgem price cap, 1 October to 31 December 2026 (retrieved 20 October 2026)
  2. Centre for Sustainable Energy, room heaters (retrieved 20 October 2026)
  3. Regulation 2015/1188 Annex II (retrieved 20 October 2026)
  4. GOV.UK ecodesign guidance (retrieved 20 October 2026)
  5. BEIS off-gas-grid electric heating (retrieved 20 October 2026)
  6. Electrical Safety First, portable heaters (retrieved 20 October 2026)
  7. SELECT, BS 7671 Section 701 (retrieved 20 October 2026)
  8. AMDEA, appliances in bathrooms (retrieved 20 October 2026)