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Portable electric heater vs oil-filled radiator

Updated: October 2026

You are choosing a heater for one room, and an oil-filled radiator can look cheaper because it stays warm after you switch it off. A portable electric heater vs oil-filled radiator choice is about speed, noise and leftover heat. Electricity costs the same per unit. The Products Compared editorial team set this out on 16 October 2026 from Ofgem’s cap rate, the Centre for Sustainable Energy, Which?’s oil-filled notes, and the rows in our [portable electric heater comparison](/hub/portable-heaters/portable-electric-heater). No oil-filled model is in that folder, so this page does not rank one. If you buy through our links, we may earn a commission at no extra cost to you. Overnight rules sit on the [bedroom page](/hub/portable-heaters/portable-electric-heater/sub/portable-electric-heater-for-bedroom).

You are choosing a heater for one room, and an oil-filled radiator can look cheaper because it stays warm after you switch it off.

Our top picks

Ballu Ballu 2000 W WiFi panel

Best overall

Ballu Ballu 2000 W WiFi panel
9.6/10about £149.99
View offer
DREO Dreo Atom 316 1500 W gold

Rank 2

DREO Dreo Atom 316 1500 W gold
9.2/10about £49.99
View offer
Amazon Basics Amazon Basics 1800 W ceramic

Preis-Tipp

Amazon Basics Amazon Basics 1800 W ceramic
9.0/10about £9.90
View offer
On this page
  1. 1.The cost is the watts
  2. 2.Speed, noise and leftover heat
  3. 3.When a heater in this comparison is the one to buy
  4. 4.When to look at an oil-filled radiator instead

The cost is the watts

At the same watts and the same hours, the cost matches. Ofgem’s Direct Debit average for 1 October to 31 December 2026 is 26.32 pence per kWh in England, Scotland and Wales. A 2 kW fan heater on full and a 2 kW oil-filled radiator on full both use 2 kWh in that hour, about 53 pence. A 1.5 kW heater of either type is about 39 pence. The Centre for Sustainable Energy says a 2 kW fan and a 2 kW convector cost the same per hour. An oil-filled example at 1.5 kW looks cheaper only because the watts are lower. Do not apply 26.32 pence in Northern Ireland or on a different fixed rate. A thermostat shortens the hour. The type does not.

Speed, noise and leftover heat

A fan or PTC heater moves hot air in minutes, and you hear the fan. UK reviews call the Amazon Basics noisy on high. Dreo’s 34 dB lines are manufacturer claims. When a fan heater switches off, the blast stops. An oil-filled radiator heats more slowly and keeps releasing heat after you switch it off. Which?’s test note describes about half an hour more warmth in their test room. Ideal Home has quoted a commercial claim of 1.5–2.5 hours. Those are different sources. The leftover heat is not free electricity. Speed is the reason to buy a fan heater for a short burst.
Ballu Ballu 2000 W WiFi panel

Testsieger

Ballu Ballu 2000 W WiFi panel
9.6/10about £149.99
View offer

When a heater in this comparison is the one to buy

Buy a fan or ceramic heater from this table when you are in the room, you want heat in minutes, and you will switch it off when you leave. The Amazon Basics at about £9.90 states 1800 W, 230 V and a tip-over switch. It is noisy on high for some people, and the listing says it is not for bathrooms. The gold Dreo Atom 316 at about £49.99 states 1500 W, 220–240 V, a 5–35°C thermostat and a 12-hour timer, without oscillation. The Warmlites are cheaper and do not state a tilt switch. For quiet electric heat that is actually listed here, the Ballu is a fanless 2000 W panel at about £149.99 and 230 V. It is not an oil-filled radiator, and tip-over is not clearly stated. Clearance steps are on the how to use page, and voltage checks on the buying guide.

When to look at an oil-filled radiator instead

Look outside this comparison when you want background heat for a long evening and warmth after switch-off. An oil-filled radiator costs the same per hour on full as a fan heater of the same watts, then keeps giving some heat. We are not naming a model, because none is in this folder. This is not permission to leave either type on overnight. Electrical Safety First says not to sleep with a heater on, and points to an oil-filled radiator only if you still do. A timer does not turn a fan heater into an oil-filled radiator. If plug-in heat is the only heating, talk to a landlord or a heating engineer.

Common questions

Which is cheaper to run?
Whichever uses fewer kilowatt-hours. At 26.32 pence per kWh, 2 kW on full is about 53 pence an hour for a fan, a ceramic tower or an oil-filled radiator. A 1.5 kW hour looks cheaper only because it is 1.5 kW. The type does not change the Great Britain Direct Debit unit rate this quarter.
Which heats the room faster?
The fan or ceramic heater, if you are in the airflow. The Amazon Basics and the Dreo towers are built for that short blast. An oil-filled radiator takes longer to bring the oil up to temperature. Faster is not cheaper, and it is not quieter.
Which is quieter?
An oil-filled radiator has no fan, so it is quieter than an Amazon Basics on high, which reviewers call noisy. The Ballu panel in this folder is also fanless, at 2000 W and about £149.99, if you want quiet heat without leaving the table. Dreo’s 34 dB lines are manufacturer claims. Quiet still does not mean safe to leave on overnight.
Which stays warm after I switch it off?
The oil-filled radiator. Which? recorded about half an hour of extra warmth in a test room. A separate commercial claim of 1.5–2.5 hours is not the same result. A fan heater stops when you switch it off. The heat in the oil was paid for at the same unit rate. It is stored heat, not free heat.
Which should I use for an hour at a desk?
A fan or ceramic heater from this comparison, switched off when you stand up. The gold Atom 316 states 1500 W and a UK voltage line. The Amazon Basics states 1800 W, 230 V and tip-over, at about £9.90, and is noisier on high. An oil-filled radiator is slow for a one-hour sit.
Is the Ballu panel an oil-filled radiator?
No. It is a fanless 2000 W panel at about £149.99 with a stated 230 V supply. It does not store heat in oil, so it will not give you Which?’s leftover half hour. Tip-over is not clearly stated. An oil-filled radiator of the same wattage costs the same on full and then coasts.

Related pages

Fan heater

Portable electric heater

Best portable electric heater: UK top pick for 2026

Portable electric heater buying guide for UK plugs

Portable electric heater for a bedroom before sleep

How to use a portable electric heater on a UK socket

Sources

Public UK sources used for this comparison. Listing prices, stars, and review counts are the amazon.co.uk lines from 16 October 2026.

  1. Electrical Safety First — portable heaters (retrieved 16 October 2026)
  2. Ofgem — energy price cap, 1 October to 31 December 2026 (retrieved 16 October 2026)
  3. Energy Saving Trust — electric heating (retrieved 16 October 2026)
  4. Centre for Sustainable Energy — room heaters (retrieved 16 October 2026)
  5. energy.org.uk — electric heaters compared (retrieved 16 October 2026)
  6. GOV.UK OPSS — portable heater plug report B0BRW4YQ7S (not in this set) (retrieved 16 October 2026)
  7. NBS — BS EN 60335-2-30 (retrieved 16 October 2026)
  8. Hertfordshire Fire and Rescue — portable heater safety (retrieved 16 October 2026)