Keilini 
Updated October 2026 · Written by the Keilini Heater Pro UK team
Quick answer
Which type of electric heater is cheapest to run? Per kWh they cost the same. The cheapest in use is the one that gives you comfort with the fewest kWh — usually a small heater with a thermostat used in one room.
The simple formula
Cost = power (kW) × hours on × price per kWh. A 1kW heater running at full power for one hour uses 1kWh. At 25p per kWh that's 25p. A thermostat that cycles the element off halves or better the real-world cost once the room is warm.
Why "low energy heater" claims can mislead
Plug-in resistance heaters all turn electricity into heat at almost 100% efficiency. No heater magically produces more heat from the same electricity (heat pumps are the exception, but they're not plug-in fan heaters). What you control is how much heat you need and for how long.
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
How to genuinely spend less
- Heat only the room you're in and turn central heating down elsewhere
- Pick a heater with a thermostat and timer
- Close doors and block draughts
- Choose fast warm-up so you don't pre-heat
- Check your tariff — off-peak rates can help
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.
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
Which type of electric heater is cheapest to run?
Per kWh they cost the same. The cheapest in use is the one that gives you comfort with the fewest kWh — usually a small heater with a thermostat used in one room.
Is it cheaper to use an electric heater or central heating?
For one room for a few hours, a portable heater can cost less. For whole-house heating, gas central heating is usually cheaper per unit of heat.