"Combi" is an abbreviation for combination because these ovens combine convection and steam cooking. What are the benefits of these two? In fact, each feature has many advantages. Convection ovens cook faster than traditional ovens, which means faster food preparation (and lower energy use). They also tend to keep moisture better than traditional ovens and produce more uniform cooking. The steam oven retains more nutrients in the food, keeps the color better, and eliminates the need for oil. Steam also prevents cross-flavoring, so you can cook salmon and chocolate cream cakes at the same time without eating a dessert.
Combined steam ovens, sometimes called convection steam ovens, help you complete holiday cooking faster and bring more health benefits. It will perform all the functions of the microwave oven, including thawing and reheating, with one exception: it does not make microwave popcorn. According to most health professionals, this is not a big loss.
If you want to remodel your kitchen in 2019, consider using a combination steam oven instead of a microwave oven. (You don't need both.) You don't need to run a waterline for it. Many models have a cistern that produces steam without the need for additional piping. This saves you the cost of retrofitting and gives you flexible placement. If you want to be convenient, there is also a pipe model. Many models are 24 inches, so if you stack it on a 27 or 30 inch traditional oven, you can add a decorative kit. There are now more extensive models.