Profile: AEF Sales Engineering Co. offers floor warming controls, power controls, snow & gutter ice melt controls, temperature controls & monitoring, temperature control and self regulating heater cable. FWT-3 provides automatic control of electric floor warming heaters. Unit includes a temperature sensor with 25' lead which is imbedded in the floor. Digital anticipation feature minimizes fluctuations in floor temperature. The SST-2 operates heaters at temperatures below 40°F (4.4°C), and turns them off above 42°F. It features a built-in 30 mA GFEP that is digitally filtered to minimize false tripping and operates from automatically selected voltages of 120, 208, 240 or 277v.