Buying Guide
Best Oil Filled Radiators UK 2026
Updated August 2026
An oil filled radiator is the cheapest way to heat one room in a UK home. It costs 30–38p per hour to run (with thermostat cycling), is completely silent, and retains heat for 30–60 minutes after switching off. Whether you need supplementary heating for a cold bedroom, a home office heater, or a portable option for a rented flat, here are the 5 best options on Amazon UK.
Quick answer
Our top pick: De'Longhi Dragon 4 / PureMate 2500W / Belaco
£35 – £120 on Amazon
Best overall: De'Longhi Dragon 4 (£80-120, Chimney Effect, fastest heating). Best budget: PureMate 2500W (£45-65). Best compact: Belaco oil radiator (£35-50).
Check Price on Amazon →How oil filled radiators work
An oil filled radiator is a sealed steel body containing diathermic oil and an electric element. The element heats the oil, the oil carries heat to the fins, and the fins warm the room by convection and radiation. The oil is never burned or topped up — it is a heat store, not a fuel.
That heat store is the whole point. It takes 10–15 minutes to warm up, but it also keeps releasing heat for 30–60 minutes after the element cuts out. Combined with a thermostat that cycles the element on and off, a 2000W radiator typically draws full power only 60–75% of the time once the room is up to temperature.
Every electric heater is 100% efficient at converting electricity to heat — a 2000W oil radiator and a 2000W fan heater produce identical heat per kWh. The difference is entirely in how well each one holds a comfortable temperature without over-running.
The 5 best oil filled radiators in the UK
De'Longhi Dragon 4 Oil Filled Radiator
The one to buy if you'll use it daily all winter. The Dragon's fin design pulls cold air in at the base and channels it up through the body, so the room reaches temperature far faster than a flat-finned radiator of the same wattage.
Pros
- Chimney Effect fins heat a room noticeably faster
- Accurate thermostat with 24-hour timer
- Three heat settings (up to 2500W)
- Excellent build — lasts a decade
Cons
- Heaviest option here
- Premium price
Who it's for: Living rooms and main rooms you heat every day
Check Price on Amazon UK →PureMate 2500W Oil Filled Radiator
Delivers the same heat per kWh as anything twice the price. The compromises are in the thermostat accuracy and the finish, neither of which matter much if the radiator lives in a spare room or home office.
Pros
- 2500W output for well under £70
- Three heat settings plus thermostat
- Built-in 24-hour timer
- Castors fitted as standard
Cons
- Thermostat dial is imprecise
- Plainer finish than De'Longhi
Who it's for: Occasional or backup heating on a tight budget
Check Price on Amazon UK →Belaco Oil Filled Radiator
Perfectly judged for a small room. Under-buying wattage is usually a mistake, but in a 10–12m² bedroom this reaches temperature quickly and then ticks over on the low setting for pennies.
Pros
- Small footprint for tight rooms
- Cheapest capable option
- Light enough to move one-handed
- Fine for bedrooms up to about 12m²
Cons
- Lower output — not for large rooms
- Basic thermostat only, no timer
Who it's for: Small bedrooms, home offices and box rooms
Check Price on Amazon UK →TP-Link Tapo Smart Plug
The single best £12 you can spend alongside an oil radiator. Set it to warm the bedroom for 30 minutes before you go up rather than leaving the heater running all evening, and the energy monitor tells you exactly what it cost.
Pros
- Adds scheduling to any oil radiator
- Energy monitoring shows real running cost
- Remote on/off from your phone
- Cheapest way to cut wasted runtime
Cons
- Check the plug's rated load against your heater
- Needs 2.4GHz Wi-Fi
Who it's for: Turning a basic radiator into a scheduled one
Check Price on Amazon UK →Oil filled radiator running costs by wattage
| Wattage | Full power / hr | Real cost / hr (cycling) | 5 hrs/day for a month |
|---|---|---|---|
| 700W | 17p | 11–13p | £17–£20 |
| 1000W | 25p | 15–19p | £23–£29 |
| 1500W | 37p | 22–28p | £33–£42 |
| 2000W | 49p | 30–37p | £45–£56 |
| 2500W | 61p | 37–46p | £56–£69 |
Based on 24.5p/kWh. Cycling assumes an insulated room where the thermostat holds the element off 25–40% of the time. Full running cost breakdown →
Which wattage for your room
| Room | Floor area | Wattage |
|---|---|---|
| Box room / home office | 6–9m² | 700–1000W |
| Single bedroom | 10–12m² | 1000–1500W |
| Double bedroom | 13–16m² | 1500–2000W |
| Living room | 18–22m² | 2000–2500W |
| Poorly insulated / conservatory | any | Add 30% |
Always round up. A 2000W radiator on setting one in a small room costs less to run than a 1000W radiator flat out, because the bigger unit reaches temperature and cycles off.
5 money-saving tips for oil filled radiators
- Use the thermostat properly. Turn the dial up until the element clicks on, then back until it clicks off. That is the lowest setting that holds your room temperature.
- Add a smart plug. A £12 Tapo plug lets you heat the room for 30 minutes before you use it rather than for four hours "just in case".
- Close the door. Heating one room only works if the heat stays in it — this is the whole cost advantage over central heating.
- Draught-proof first. A £10 door brush and window strips make a bigger difference than moving up a heat setting.
- Position away from external walls and windows. Put it on an internal wall so the heat goes into the room, not through the glazing.
Oil filled radiator safety tips
- Plug directly into a wall socket. Never use an extension lead or a multi-way adaptor with a 2000W+ heater.
- Keep at least one metre clear of curtains, bedding and furniture.
- Never dry clothes on the radiator — it blocks convection and creates a fire risk.
- Check for a tip-over cut-off and thermal overload protection before buying.
- Stand it on a hard level surface, not on deep pile carpet or a rug that can bunch.
- Fins get hot enough to burn. Use a guard if young children or pets are around.
Oil radiator vs fan heater vs panel heater
| Oil radiator | Fan heater | Panel heater | |
|---|---|---|---|
| Warm-up speed | 10–15 min | Instant | 5–10 min |
| Heat retention | 30–60 min | None | Minimal |
| Noise | Silent | Loud | Silent |
| Best for | Hours of steady heat | 10-minute bursts | Wall-mounted background heat |
| Typical price | £35–£120 | £15–£40 | £50–£150 |
Buying advice
Buy on thermostat quality, not wattage
Tip
A timer or smart plug pays for itself in weeks
Warning
Never use an extension lead
Frequently asked questions
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