Rational AG is a German manufacturer and retailer of combi steamers and ovens, cooking appliances suitable for large and commercial kitchens. The company is based in Landsberg am Lech, Germany, and was founded by Siegfried Meister in 1973. Since its establishment, Rational has grown from 18 to 2,042 employees worldwide, and around half of the dilos work at the HQ. The company distributes its combi steamer in more than 100 countries. Rational's share in the global market is 54 percent.