Heater types
Plug-in radiators, plug-in heaters and plug-in panels
The short answer
Three names are used almost interchangeably online, and they describe quite different products. Knowing which is which stops you buying a slow radiator when what you wanted was quick heat.
Written and checked by the RapidHeat UK team · Last updated September 2026 · how we work out running costs
Key takeaways
- "Plug-in radiator" is used for two different things: oil-filled radiators and small plug-in heaters.
- Oil-filled units are silent and hold heat; plug-in ceramic heaters warm the room far faster.
- Neither needs plumbing or installation — both simply use a standard UK socket.
The three things sold as "plug-in radiators"
- Oil-filled electric radiators. Metal columns filled with thermal oil. Slow to warm up, silent, and they keep giving out heat after switch-off. Typically 800 W to 2,500 W and heavy, though most have castors.
- Convector or panel heaters. Slim boxes, often wall-mountable, that warm air as it rises through them. Good gentle background heat and frost protection; slow to make a cold room feel warm.
- Plug-in ceramic heaters. Compact units that plug into a socket and push warm air out with a quiet fan. Fastest of the three for making one room comfortable.
Which to choose for which situation
| Your situation | Best fit | Why |
|---|---|---|
| Sitting in one room all evening, want silence | Oil-filled radiator | No fan noise, retains heat after switch-off |
| Want the room warm quickly, then off again | Plug-in ceramic heater | Useful warmth in minutes, thermostat holds it |
| Frost protection in a hall or spare room | Convector panel | Low output, wall-mounted, out of the way |
| Working at a desk in a cold room | Plug-in ceramic or a small desk heater | Directed warmth where you sit |
| Whole house cold | Central heating | No plug-in appliance is designed for this |
Do plug-in radiators use a lot of electricity?
They use exactly as much as their rating says while they are on. A 2 kW oil-filled radiator costs roughly 54p an hour at 27p per kWh when the element is running; because it cycles once up to temperature, the average over an evening is lower. A 1.2 kW plug-in ceramic heater is about 32p an hour flat out. What decides your bill is total kilowatt-hours: power × time. Smaller room, lower setting, shorter run time. Full workings in running costs.
Safety points specific to plug-in heating
- Always into a wall socket — heaters and extension leads are a poor combination.
- Never cover a radiator or heater to dry washing.
- Leave the air intake clear; blocked intakes trigger overheat cut-offs for a reason.
- Check for overheat protection and, on free-standing units, a tip-over switch.
Where RapidHeat sits
RapidHeat is the third kind: a compact plug-in ceramic heater for rooms up to about 12 m², with a thermostat, timer, remote and overheat cut-off. If your priority is a room that feels warm within five minutes rather than one that stays warm after you leave, it is the better pick. If you want silence and slow, lasting heat, an oil-filled radiator is a fairer choice — the honest comparison is in ceramic vs oil-filled.
RapidHeat ceramic heater
4.8/5 · 1,247 UK customers£49.95· £89.91 for two · £110.89 for three (about £36.96 each)
- Thermostat, timer and remote
- Warm room in about 5 minutes
- Free tracked UK delivery
- 30-day money-back guarantee
Perfect for my cold office
I have a small office with a door that gets really cold because the building management keeps the winter temperature far too low for comfort. I plugged this into the socket above my desk and now I am warm without anyone even knowing it is there. I love it.
Great in the bathroom
We use it to take the chill off the bathroom before the kids' bath time. Warms up fast and the timer is handy. Four stars only because I wish the display were a little dimmer at night.
Worth being straight about: RapidHeat is built for rooms up to about 12 m². It is not a replacement for central heating and it will not transform an open-plan lounge or an uninsulated garage. If it is not right for your room, send it back within 30 days.
Questions people ask
- What is the difference between a plug-in radiator and a plug-in heater?
- An oil-filled plug-in radiator heats oil inside metal fins and radiates gentle warmth for a long time, silently. A plug-in ceramic or fan heater pushes warm air out immediately. Radiators suit all-day background heat; heaters suit warming a room quickly when you walk in.
- Do plug-in radiators use a lot of electricity?
- They draw whatever their rating says while the element is on — a 1,500 W unit is about 40p an hour at 27p per kWh. Because they retain heat, a thermostat keeps the element off for a good part of each hour once the room is warm.
- Can a plug-in radiator replace central heating?
- For a single room you rarely use, yes. For a whole house, no — gas central heating is cheaper per unit of heat and electric radiators in every room would be expensive.
- Do I need an electrician to fit one?
- No. Anything sold as plug-in runs from a normal 13 A socket. Plug it directly into the wall rather than an extension lead or a multi-way adaptor.
Ready to warm your room in about 5 minutes?
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