The German vacuum-cleaner company has been building its Kobold model for almost 80 years,and sold more than 80 million units. In recent years,Vorwerk has concentrated on making its cleaners more efficient,and in making its production process more efficient. The company understands that that's good for the environment -- and the bottom line.Energy-saving measures are saving the company more than 600,000 euros a year. Its finely-tuned energy-management system has made Vorwerk a pioneer in the economical use of raw materials. Elisabeth Pongratz investigates where the biggest savings can be found as Vorwerk energy-managers examine every system and production process.