The Good Housekeeping Seal Recognized for their quality manufacturing Bosch 300 Series are backed by The Good Housekeeping Seal - a two-year limited warranty. Ovens Key Features. 300 Series Oven Performance. 1 In Capacity. Convection Bake Broil Roast. 300 Series Oven Efficiency: Fast Preheat. ECOCLEAN Self-Clean Cycle. 300 Series Oven Quality. High Quality Rack Supports. Ergonomic Dials with Glass Touch Control. Recessed Heating Element. Flush-to-Cabinet Design.