Controls Simple operation, intelligent functions: that is the basic concept of the Logamatic 2000 Series. Buderus Logamatic controls monitor both indoor and outdoor temperature and accordingly adjusts boiler temperature to actual demand. Lower operating water temperature decreases cool-down and flue gas losses which translate lowers energy consumption and fuel bills. The patented Buderus "Variable Differential" delivers 40% fewer burner starts, which translates into much cleaner operation. Our Logamatic control can reduce annual fuel consumption by as much as 30%. The Logamatic control will provide you with the heating comfort and fuel efficiency you should expect from a hot water heating system