Combination Oven/Steamers, affectionately termed "combi ovens" on occasion, are designed to provide the ultimate variety in a kitchen. Most of them come with 3 cooking modes- steam, hot air, and combination. Steam mode keeps flavors and colors in foods. Hot air mode uses circulated air to cook in a manner similar to a convection oven. Combination mode Ð the key to a combination oven- uses both steam and hot air to cook foods, giving a perfectly even cook at almost twice the speed.