Quick answer
A ceramic heater warms air over a self-regulating PTC ceramic element instead of a glowing coil. It heats up in seconds, draws less power as it gets hot, and has no exposed red-hot wire. Ceramic heaters aren't more efficient per kWh, but because they heat quickly and target one room, they're usually cheap to run in practice.
Quick checklist
- Genuine PTC ceramic element (not a coil described as 'ceramic')
- Thermostat
- Tip-over and overheat cut-offs
- Quiet fan
- Clear wattage and UK plug
How a ceramic heater works
Inside is a honeycomb of ceramic cells. When current flows they heat up within about 2 seconds, and their resistance rises with temperature, so they automatically draw less power. A fan pushes air through the honeycomb and into the room.
Ceramic vs other heaters
| Ceramic | Coil fan | Oil-filled | |
|---|---|---|---|
| Warm-up | ~2 s | Seconds | 20–30 min |
| Glowing element | No | Yes | No |
| Self-regulating | Yes | No | No |
| Weight | Light | Light | Heavy |
Are ceramic heaters cheap to run?
Per kWh, every electric heater costs the same. Ceramic heaters save money by reaching temperature fast and then cycling with the thermostat. Typical use of a 1200W ceramic heater is about 16p an hour.
Are ceramic heaters safe?
Yes. There's no exposed hot wire, the element limits its own temperature, and good models add tip-over and overheat cut-offs. They burn no fuel, so they produce no carbon monoxide.
What it costs to run (current UK prices)
At the Ofgem price cap of 26.32p per kWh (1 October to 31 December 2026), a 1200W heater like the K1 costs about 32p an hour at full power. Once the room is warm the thermostat switches the heater on and off, so in normal use it averages about 16p an hour.
| How long | Typical cost per day | Over 30 days |
|---|---|---|
| 1 hour | 16p | £4.74 |
| An evening (4 hours) | 63p | £18.95 |
| A working day (8 hours) | £1.26 | £37.90 |
Your own price may be a little higher or lower depending on your region and tariff. See how we calculate running costs or try the running cost calculator with your own unit rate.
How a ceramic heater works
A PTC (positive temperature coefficient) ceramic element heats up quickly when electricity flows through it. As it gets hot, its resistance rises, so it naturally limits its own temperature. A small fan blows air across the warm ceramic plates and into the room.
Because the element self-limits, it doesn't glow red like a coil, which is why ceramic heaters are popular for bedrooms and homes with children or pets.
Ceramic vs oil-filled vs halogen
Ceramic heaters warm you in seconds and are light. Oil-filled radiators take 20–30 minutes but keep radiating after they switch off, which suits all-day background heat. Halogen heaters warm what they point at but not the room, and the bright glow can be tiring.
For warming one room quickly in the evening, ceramic is usually the best balance of speed, safety and cost.
Do ceramic heaters really save money?
The element itself isn't more efficient; all electric heaters turn about 100% of electricity into heat. The money saving comes from heating up fast, so you run it for less time, and from a thermostat that cuts power once the room is warm.
How the K1 compares with other heaters
| Heater type | Warm in | Running cost | Safety and comfort |
|---|---|---|---|
| Ofenwerk K1 (ceramic) | About 2 seconds | About 16p/hour typical | Tip-over and overheat cut-off, cool-touch case, no glowing coil |
| Coil fan heater (2–3kW) | Seconds | 53–79p/hour at full power | Hot coil, can smell of burnt dust, often noisy |
| Oil-filled radiator (1.5–2.5kW) | 20–30 minutes | 39–66p/hour at full power | Surfaces get hot, heavy to move |
| Convector (2kW) | 10–15 minutes | About 53p/hour at full power | Heat rises to the ceiling first |
| Electric blanket (100W) | 10–20 minutes | About 3p/hour | Warms the bed only, not the room |
Full-power costs worked out at 26.32p per kWh. Thermostats lower all of these in real use.
Using any electric heater safely
These tips follow UK fire-service and Electrical Safety First advice and apply to any portable heater, including ours:
- Plug the heater straight into a wall socket. Don't use an extension lead or adaptor; they can overheat.
- Keep it at least 1 metre from curtains, bedding, clothes and furniture.
- Stand it on a flat, hard, stable surface where it can't be knocked over.
- Never cover it or dry clothes on it.
- Switch it off at the wall when you go out.
- Check the plug and cable now and then. Stop using it if either is damaged or feels hot.
- Make sure you have a working smoke alarm on every floor. Many UK fire services fit them free for older residents.
When the K1 is not the right choice
We'd rather you buy the right heater than return ours. The K1 is probably not for you if:
- You want to heat a large open-plan space over about 20 m² with one heater. Two K1s, or a bigger heater, will do a better job.
- You want gentle all-day background heat with no fan. An oil-filled radiator may suit you better.
- You need total silence. The K1 has a gentle fan sound, a bit like a quiet laptop.
Our pick: the Ofenwerk K1 Heater
- Warm air in about 2 seconds (PTC ceramic)
- 1200W, heats rooms up to 20 m²
- Tip-over and overheat cut-offs, cool-touch casing
- Thermostat + remote, about 16p an hour typical
- Free UK delivery, 30-day money back, 24-month warranty
Frequently asked questions
What is a ceramic heater?
An electric heater that uses a PTC ceramic element to warm air quickly and safely.
Are ceramic heaters energy efficient?
They turn almost all their electricity into heat, like every electric heater. Their real advantage is speed and thermostat control.
Can ceramic heaters cause carbon monoxide?
No. They're electric and burn no fuel.
Are ceramic heaters any good?
Yes, for quick, targeted warmth in rooms up to about 20 m².
Are ceramic heaters safe to leave on?
Good ceramic heaters have a self-limiting element plus tip-over and overheat cut-offs. Even so, follow safety advice: keep clear space around it and switch off when you leave the house.
Do ceramic heaters smell?
A new heater can give a faint smell for the first few minutes of use. Ceramic elements don't get as hot as coils, so they don't usually give the burnt-dust smell of older fan heaters.
Are ceramic heaters better than fan heaters?
A ceramic heater is a type of fan heater with a ceramic element instead of a bare coil. It's usually quieter, safer to touch and has no glowing element.
How long does a ceramic heater take to warm a room?
You feel warm air within seconds. A typical 12 m² room feels noticeably warmer in about 10–15 minutes, depending on insulation.
Sources and how we checked this guide
- Electricity price: Ofgem: energy price cap unit rates and standing charges, checked 25 October 2026.
- Heater safety: UK fire and rescue service advice and Electrical Safety First guidance on portable heaters.
- K1 figures (1200W, about 2-second warm-up, room size up to 20 m², safety cut-offs) come from the product specification.
- Costs are worked out with the method on how we calculate running costs.