Instead, you can choose from four widths: a 30-cm gas hob, 60-cm gas hob, 75-cm gas hob, and 90-cm gas hob. One benefit of an extra-wide, 90-cm gas hob: ample space to cook fish, boil pasta and steam broccoli at once. In the end, finding the right hob for you depends on factors like your cooking habits and the width of your lower kitchen cabinets.