Hello, I ahve a dimplex FXL 24N heater on economy seven in my living room, can it only has one dial under the flap 'Room Temperature' whioch turns to 1 to 6 then a 'boost' button at the side, what number ( 1-6) on the room temperature dial do i need to set it to at night during these cold winter months to get good heat the following day? i ahve been told by various people to set it to 1 when i go to bed and others say 6 and turn down when i get up in the morning, aslso do i need ot have both electricty supplies switched on at the wall? at the moment i only have off peak switched on, please help!