Current Wallas heaters and Stove/Heaters are fitted with Wallas’ proprietary control panels, which utilize Proportional-Integral (PI) control logic. As the only forced air heaters in the marine business with full time, stepless, variable power output, Wallas diesel systems are well served by the PI system. PI control allows the panel to control power output smoothly, maximizing efficiency and eliminating the need to stop & start while targeting your desired temperature choice. Minimum fuel and electrical demand while supplying maximum comfort! For more information just go to Scan Marine at http://www.scanmarineusa.com/ or call 888-606-6665.