Hi We have a very cold bathroom it has 3 solid brick outside walls, it has a small single radiator 600 x 600. The room is 2.5m x 2.6m. I want to change the radiator for a bigger one, I calculated about 1300 watts is needed. Does anyone know if a single radiator 1400 x 620 feel would feel hotter than a DP + one 720 x 800 due to bigger surface area covering outside wall or is it just personal preference?