How to use an oil filled radiator
Updated: 22 October 2026
You have unpacked a portable column and searched how to use an oil filled radiator because the manual is thin on timers and the first hour smells alarming. This guide covers a UK-safe setup for the oil-filled and oil-free portables in the [radiator comparison](/hub/heating/radiator). It is the process, not a ranking. Peter F. checked the amazon.co.uk listings and public UK sources, including Electrical Safety First. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.
You have unpacked a portable column and searched how to use an oil filled radiator because the manual is thin on timers and the first hour smells alarming.
You have unpacked a portable column and searched how to use an oil filled radiator because the manual is thin on timers and the first hour smells alarming. This guide covers a UK-safe setup for the oil-filled and oil-free portables in the radiator comparison. It is the process, not a ranking. Peter F. checked the amazon.co.uk listings and public UK sources, including Electrical Safety First. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Timer | Thermostat | Safety named | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  De'Longhi De'Longhi Dragon 4 TRD40820T | Mechanical 24-hour | Manual | Safety thermostat | 8.7 | about £149 | View offer |
 Pro Breeze Pro Breeze PB-H 2500 W | 24-hour | Adjustable | Tip-over, overheat | 9.0 | about £79.99 | View offer | |
 Russell Hobbs Russell Hobbs RHOFR5001B | No timer in title | Adjustable | Tip-over, overheat | 9.0 | about £42.95 | View offer |
On this page
Before you switch on
Choose a sound wall socket. Electrical Safety First warns against extension leads for a sustained 2–2.5 kW draw unless the manufacturer allows it. These listings do not. Route the cable so nobody trips, and keep the plug visible.
Stand the unit level, clear of curtains and bedding. De'Longhi stresses ventilation gaps and upright use. Do not sit it under a dripping window or where a door hits the fins. A tip-over cut-out is not a licence to block the airflow with a deep carpet pile.
Most castors clip on with wing nuts. Devola reviewers warn you never to tip the column upside down to fit the wheels, because oil can weep. Keep it upright in storage too.
First heating cycle
A new oil-filled radiator often smells of hot dust or light oil for the first one or two hours. De'Longhi advises a ventilated full-power run while you stay in the room. Stop if you see smoke or a plastic odour. An oil-free Dimplex may smell less. Any first run still needs supervision.
Expect 15–30 minutes before the room feels warmer. The oil keeps radiating after the thermostat cuts out. Do not cover the heater to speed the room up.
Thermostat and timer
Start the thermostat mid-scale, watch a cycle, then adjust. A higher number means a longer run, not instant comfort. A 1,000 W or 600 W step holds a warm room more cheaply than locking 2,500 W on high.
On Pro Breeze, NETTA, Dreo and Devola, a 24-hour timer can come on before you wake. A mechanical Dragon uses rotating segments. An electronic Dragon uses buttons. Read the card in the box. The Russell Hobbs title has no built-in timer. An external timer must be rated for the load, on its own wall socket, not a lamp timer on a four-way block.
Test one day while you are home. Reviewers report mechanical timers that fail silently. On Dreo and the smart Pro Breeze, fall back to manual high and low if eco mode mis-reads the room.
Running cost in practice
Billable energy is kilowatts times hours times pence per kWh, tempered by how often the thermostat is on. At 26.32 pence per kWh, the Ofgem illustration for Great Britain from October to December 2026, 2 kW at full power is about 52.6 pence an hour. A real evening often averages less.
If the bill surprises you, log one week on a smart meter. Leaving 2.5 kW on high, with no cut-down, costs more than the fin brand. A portable wins when only one room needs heat and you hold about 1 kW after the first warm-up hour.
End of season storage
Switch off, unplug, and let the fins cool. Coil the flex without a sharp bend. Store the column upright so the oil stays in the sump. Laying it flat risks a leak. Wipe dust off the fins. Do not hose it down.
Let the fins cool before you lift a column over 11 kg. Two people on the stairs beat dragging a hot unit. A setting that held a 12 m² bedroom may cycle too often in a larger lounge. Note which room it belonged to.
Common questions
How long does an oil filled radiator take to warm up?
In typical reviews the air feels warmer in 15–30 minutes. An oil column keeps radiating after the thermostat switches the element off, so the room does not drop the moment the click happens. Oil-free panels feel quicker at the start and cool sooner. Covering the fins to hurry the room is a fire risk, not a shortcut. Stay with the heater for the first cycle and ventilate if there is a mild new-unit smell.
Is the smell on first use normal?
A light odour with a window open is common for the first one or two hours, from hot dust or manufacturing oil. De'Longhi's first-run advice is a ventilated full-power session while you stay in the room. Burning plastic, smoke, or a persistent acrid smell is not a normal burn-in. Switch off, unplug, and contact the seller. Do not leave that cycle running while you go out.
Can I leave it on overnight?
Electrical Safety First discourages unattended heat, especially while you are asleep, because you cannot react to a fault or to fabric on the fins. A timer that pre-warms the room, then a lower setting or off once you are in bed, matches that guidance better than eight hours on high. Keep a working smoke alarm. Bedroom clearance and the pre-warm window are set out on oil filled radiator bedroom.
How do I set the 24-hour timer?
Follow the card packed with your model. Pro Breeze, NETTA, Dreo and Devola use pins or a digital menu. A mechanical Dragon uses rotating segments. An electronic Dragon uses buttons. Run one watched on-and-off cycle while you are at home before you trust a day you will be out. A silent failure is a known review theme on mechanical timers. The Russell Hobbs title in this set has no built-in timer.
How do I store it in summer?
Let it cool, then keep it upright in a dry place with the cable loosely coiled and the dust wiped off the fins. Do not lay an oil-filled column flat. A note of the thermostat setting that suited that room saves a week of guessing next autumn. Check the castors before you roll it out again. If oil has appeared under a stored unit, stop and contact the maker.
Related pages
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.
- Electrical Safety First — portable heaters (retrieved 20 October 2026)
- Devon and Somerset Fire and Rescue — heater safety (retrieved 20 October 2026)
- BS EN 60335-2-30 scope (retrieved 20 October 2026)
- legislation.gov.uk Annex II 2015/1188 (retrieved 20 October 2026)
- GOV.UK ecodesign guidance (retrieved 20 October 2026)
- Ofgem price cap 1 October to 31 December 2026 (retrieved 20 October 2026)
- Centre for Sustainable Energy — room heaters (retrieved 20 October 2026)
- De'Longhi GB Dragon TRD40820T (retrieved 20 October 2026)