hi all just want to make sure I am doing my sums correct. someone maybe able to help me. im looking to get a plug in electric heater as a supplementary heat source to one of my rooms this winter (it is already heated by a rad but can still be nippy). I know electric heaters are expensive to run but I will only have it on for max 2 hours per day so I want to calculate estimated cost. I understand the unit of electricity is the KwH...at 15cent per KwH (per my bill)? So am I correct in saying if I was to buy a 1000Watt (1Kw) heater that I will pay 15cent per hour to run it? a 2000 Watt (2Kw) heater would cost 30 cent an hour to run? etc etc? So if I have the 1KW heater plugged in for 2 hours per day it would cost me 30cent per day? Apologies...bad on the Maths here..am I missing something.thanks!