Flat Ladder Type Niche Size Straight Bathroom Radiator. 200mm 600mm 3 + 4 + 4 = 11 Total Bars 444 130. 200mm 800mm 3 + 4 + 8 = 15 Total Bars 596 175. 200mm 1000mm 4 + 4 + 4 + 7 = 19 total Bars 747 219.