Our system consists of a 230V 150w per square metre cable which can be rolled out and to fit any shape room. Within the cable is a thin 2.0 mm heating cable. The cable should be laid directly under the surface to be heated, pressed down and then tiled over, you may wish to add self-leveling screed or cover it with a thin layer of tile adhesive to ensure that the surface is flat. Cable spacing; To achieve 100w output per sqm = 18cm To achieve 150w output per sqm = 12cm To achieve 200w output per sqm = 9cm Use the table below to decide what length of cable you require Cable Length Total Output 100w per m2 150w per m2 200w per m2 11.1m 200w 2 m2 1.3 m2 1 m2 16.7m 300w 3m2 2 m2 1.5 m2 22.2m 400w 4 m2 2.6 m2 2 m2 27.8m 500w 5 m2 3.3 m2 2.5 m2 33.3m 600w 6 m2 4 m2 3 m2 38.9m 700w 7 m2 4.6 m2 3.5 m2 44.4m 800w 8 m2 5.