Keilini 
Updated October 2026 · Written by the Keilini Heater Pro UK team
Quick answer
What is the cheapest electric heater to run in the UK? Wattage for wattage, plug-in heaters cost the same per hour. The cheapest in practice is a correctly sized heater with a thermostat and timer, used to heat only the room you're in.
The main types of electric heater
- Fan heaters – blow air over a hot element. Fast, cheap to buy, portable.
- Ceramic heaters – a fan heater with a ceramic PTC element that self-limits its temperature. Fast and generally considered safer than bare wire elements.
- Oil-filled radiators – heat oil sealed inside fins. Slow to warm up but silent and hold heat for a while after switching off.
- Convector and panel heaters – warm air rises naturally across the element. Good for steady background heat, usually wall-mounted or floor-standing.
- Halogen and infrared heaters – heat people and objects directly in front of them rather than the air.
Do some electric heaters cost less to run?
Every plug-in resistive heater turns electricity into heat at essentially 100% efficiency, so a 1kW heater uses about 1kWh per hour on full power whatever its type. The real difference is how much heat you actually need and for how long.
A heater that warms you up quickly and has a thermostat and timer will usually use less electricity in practice, because it isn't left running at full power. Heating one room instead of the whole house is where most savings come from.
Which electric heater should you buy?
- Quick warmth in one room you use for a few hours: a ceramic fan heater.
- All-day silent background heat in a large room: an oil-filled radiator.
- Permanent heat in a room without radiators: a wall-mounted panel heater.
- Outdoor or very draughty spaces: infrared/halogen.
Our pick for warming one room
Keilini Heater Pro
Ceramic PTC · warm in ~3s · 36–45dB · tip-over & timer shut-off
£59.98£119.98Save 50%
See packs & prices- Free UK delivery
- 30-day returns
- Secure checkout
Where Keilini Heater Pro fits
Keilini Heater Pro is a compact ceramic PTC fan heater. It starts producing warm air in around 3 seconds, spreads it through a 90° grille, and runs at roughly 36–45dB. A built-in thermostat holds your chosen temperature, a tip-over switch cuts power if it is knocked over, and a timer switches it off after 1–12 hours.
It is designed to warm the room you are in — not to replace central heating for a whole house.
Safety checklist for any electric heater
- Tip-over and overheat protection
- UKCA or CE marking and a UK plug
- Keep 1 metre from curtains, bedding and furniture
- Plug straight into a wall socket, not an extension lead
Electric heater types compared
| Type | Warm-up | Portability | Best for |
|---|---|---|---|
| Ceramic fan (Keilini Heater Pro) | Seconds | Very easy | Quick personal warmth |
| Standard fan heater | Seconds | Easy | Short bursts |
| Oil-filled radiator | 15–20 min | Heavy | Long, silent heat |
| Panel/convector | 5–10 min | Fixed/medium | Background heat |
| Infrared/halogen | Instant | Medium | Spot heating, garages |
Our pick for warming one room
Keilini Heater Pro
Ceramic PTC · warm in ~3s · 36–45dB · tip-over & timer shut-off
£59.98£119.98Save 50%
Or 3 for £139.97 — £46.66 each.
See packs & prices- Free UK delivery
- 30-day returns
- Secure checkout
Frequently asked questions
What is the cheapest electric heater to run in the UK?
Wattage for wattage, plug-in heaters cost the same per hour. The cheapest in practice is a correctly sized heater with a thermostat and timer, used to heat only the room you're in.
Are electric heaters safe to leave on overnight?
Only use a heater overnight if it has tip-over protection, overheat protection and a timer, and keep it well away from bedding. Using the timer is the safest option.
What size electric heater do I need?
As a rough guide, small rooms and personal use suit compact heaters; large or poorly insulated rooms need higher-wattage or longer-running heaters.