12.5kW. Natural gas Featuring a powerful dual ring 900mm natural gas bullseye solid top, the Blue Seal Evolution Series G57-CB is ideal for the busy restaurant, takeaway, hotel or school. To add versatility to the solid top, this model also features a handy open cabinet, which offers convenient additional storage. The solid top has multiple cooking zones and allows many pans to be used simultaneously. That, alongside the solid stainless steel construction, ensures easily cleaning and sturdy, reliable operation.