A combi steamer is a professional cooking appliance that combines the functionality of a convection oven

Convection oven

Although the word convection is usually used to describe the natural circulation of gas or liquid caused by temperature differences, the convection in "convection oven" has a more general definition: the transfer of heat via movement of gas or liquid...

 and a steam cooker

Food steamer

A food steamer or steam cooker is a kitchen appliance used to prepare various foods in a sealed vessel that limits the escape of air or liquids below a preset pressure.-Advantages:...

. That is, it can produce dry heat, moist heat or a combination of the two at various temperatures. Therefore it is fit for many culinary applications including baking, roasting, grilling, steaming, braising, blanching, and poaching. Advantages of this technology are very short cooking times and a gentle preparation method, which leads to better preservation of vitamins and nutritional value of foods than with traditional cooking methods.