Although RATIONAL has successfully worked the market for more than 30 years, still only 25 percent of a potential 2.5 million kitchens have switched to combi-steamer technology. This means that 75 percent, or 1.9 million kitchens throughout the world, still cook with obsolete technology. Our SelfCooking Center® technology, which we introduced in 2004, now supersedes not only traditional cooking appliances but also any combi-steamers already installed, reducing the market penetration worldwide practically back to zero.