Electric fan heater or gas central heating?

[FaithLoveandGrace]

Hi all,

I'm wondering which is cheaper - using an electric fan heater to heat one room, or using the gas central heating? We live in a small flat but the living room is by far the largest. DP thinks it's cheaper to just use the fan heater in that room but I'm not so sure.

[GallicIsCharlie]

You can probably find calculators online. Fan heaters cost a bomb to run! Do you not have valves on the radiators, to turn down the ones in little-used rooms?