The best oil filled radiators (November 2026)
Oil filled radiators give steady, silent heat and keep warming after they switch off: the best portable choice for rooms you heat for hours. Our ranking, what each costs per hour and per month, and the best for each room.
The ranking for November 2026
| # | Model | Type | Power | Per hour | Per month* | Controls | Score | |
|---|---|---|---|---|---|---|---|---|
| 1 | De'Longhi Radia S TRRS0920E.G 2000W Digital oil radiator | Oil filled radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Digital thermostat, eco mode, timer | 8.5 | Check price → |
| 2 | De'Longhi Dragon 4 TRD40820T Classic, 10-year warranty | Oil filled radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Dial thermostat, timer | 8.4 | Check price → |
| 3 | De'Longhi Dragon 4 TRD41025T 2.5kW Premium for large rooms | Oil filled radiator | 2,500 W | 65.8p | £59.22 5 hours a day on thermostat | Dial thermostat, timer | 8.1 | Check price → |
| 4 | Dimplex ECR20 Oil Free Radiator 2kW Oil-free, lighter | Oil-free radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Dial thermostat | 7.9 | Check price → |
| 5 | Russell Hobbs RHOFR5001 1500W 7 Fin Oil Filled Radiator Best value oil radiator | Oil filled radiator | 1,500 W | 39.5p | £35.53 5 hours a day on thermostat | Dial thermostat | 7.6 | Check price → |
| 6 | Dimplex ECR24TiFB 2.4kW Oil-Free Radiator with Turbo Fan Fast heat, large rooms | Oil-free radiator | 2,400 W | 63.2p | £56.85 5 hours a day on thermostat | Dial thermostat, timer | 7.6 | Check price → |
| 7 | Russell Hobbs RHOFR2009B-D 2000W Digital Oil Filled Radiator Digital with remote | Oil filled radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Digital thermostat, timer, remote | 6.9 | Check price → |
| 8 | Dimplex ECR20TIE Oil Free Radiator 2kW with Timer Oil-free with timer | Oil-free radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Dial thermostat, timer | 6.7 | Check price → |
| 9 | Russell Hobbs RHOFR9004B 2000W 9 Fin Oil Filled Radiator 2 kW on a budget | Oil filled radiator | 2,000 W | 52.6p | £47.38 5 hours a day on thermostat | Dial thermostat | 6.4 | Check price → |
| 10 | Russell Hobbs RHOFR3001W 650W 5 Fin Oil Filled Radiator Lowest running cost | Oil filled radiator | 650 W | 17.1p | £15.40 5 hours a day on thermostat | Dial thermostat | 6.2 | Check price → |
De'Longhi Radia S TRRS0920E.G 2000W
Digital thermostat, eco mode, timer
De'Longhi Dragon 4 TRD40820T
Dial thermostat, timer
De'Longhi Dragon 4 TRD41025T 2.5kW
Dial thermostat, timer
Dimplex ECR20 Oil Free Radiator 2kW
Dial thermostat
Russell Hobbs RHOFR5001 1500W 7 Fin Oil Filled Radiator
Dial thermostat
Dimplex ECR24TiFB 2.4kW Oil-Free Radiator with Turbo Fan
Dial thermostat, timer
Russell Hobbs RHOFR2009B-D 2000W Digital Oil Filled Radiator
Digital thermostat, timer, remote
Dimplex ECR20TIE Oil Free Radiator 2kW with Timer
Dial thermostat, timer
Russell Hobbs RHOFR9004B 2000W 9 Fin Oil Filled Radiator
Dial thermostat
Russell Hobbs RHOFR3001W 650W 5 Fin Oil Filled Radiator
Dial thermostat
* Typical use shown under each figure, 30 days, at the Ofgem price cap (26.32p/kWh). Typical means the seller does not publish the power, so we use a typical figure for that kind of appliance. Recalculated every update.
- Running cost: What each one costs per hour and per month at the Ofgem price cap (26.32p/kWh). Watt for watt, every electric heater costs the same to run: the one that saves money is the right size and switches itself off.
- Controls: Thermostats, timers, weekly schedules, eco modes and Wi-Fi score highest: they are what actually cuts the bill.
- Safety: Tip-over and overheat protection, and splash protection (IP24) for bathrooms.
- What buyers say: Amazon UK sales and what buyers repeat in their reviews, summarised in our own words. Newer models with few reviews score lower until they have them.
We don't test products at home: we combine manufacturers' specifications, Amazon UK listings and buyer feedback with the running-cost maths. How we compare.
The best for each situation
De'Longhi Radia S TRRS0920E.G 2000W
Built to last, with timer and anti-frost.
Check price on Amazon →Russell Hobbs RHOFR5001 1500W 7 Fin Oil Filled Radiator
Three settings and a thermostat for very little money.
Check price on Amazon →Russell Hobbs RHOFR3001W 650W 5 Fin Oil Filled Radiator
Only 650 W: the cheapest way to keep a small room warm for hours.
Check price on Amazon →Dimplex ECR20 Oil Free Radiator 2kW
Warms up faster and is easier to move.
Check price on Amazon →Russell Hobbs RHOFR2009B-D 2000W Digital Oil Filled Radiator
Comes on before you get up and goes off when you leave.
Check price on Amazon →If you buy through our links, Amazon pays us a small commission. The price is the same for you.
Do oil filled radiators use a lot of electricity?
No more than any electric heater of the same power: a 2 kW model uses 2 kWh an hour at full power. Their advantage is that the oil holds the heat, so once the room is warm the thermostat keeps them off for longer, and they are silent. Choose roughly 100 W per m²: 1.5 kW for a 15 m² bedroom, 2 kW for a 20 m² living room.
Oil filled or oil-free?
Oil-free column radiators (like the Dimplex ECR20) are lighter and warm up faster; oil filled ones hold the heat a little longer. Running costs per watt are the same.
🧮What is the cheapest way to heat your home? Gas, electric, heat pump or heated throw: the numbers→Frequently asked questions
How much does an oil filled radiator cost to run?
A 2 kW model costs 52.6p an hour at full power at the price cap. On the thermostat, 5 hours a day, about £47.38 a month; a 1.5 kW model about £35.53.
Are oil filled radiators cheaper to run than fan heaters?
Per hour at full power, no: watt for watt they cost the same. Over a whole evening they often cost less because the thermostat keeps them off for longer once the room is warm.
Can I leave an oil filled radiator on overnight?
They are designed for long periods. Use the thermostat on a low setting, keep it away from bedding and curtains, and plug it straight into the wall.
What size oil filled radiator do I need?
About 100 W per m² in a reasonably insulated room: 650 W for a box room, 1.5 kW for a 15 m² bedroom, 2–2.5 kW for a living room.
Running costs use the Ofgem energy price cap, 1 October to 31 December 2026: average unit rate for electricity paid by Direct Debit (26.32p/kWh, standing charge 54.83p/day) and gas (7.97p/kWh). National averages; your region and tariff may differ. Prices on Amazon change: check the live price before you buy.