A heated wiper assembly includes a wiping element adapted to contact a surface to be wiped. A composite fiber shell is fixed to an outer surface of a metal inner shell. In one embodiment, the user is presented with an adjustable user interface widget such as a slider that allows the user to select any shading setting along a shading continuum. The at least two coil assemblies are mounted to one of the housing and the shaft. A maximum fan torque loss for the engine speed is estimated by interpolating between the first maximum fan torque loss and the second maximum fan torque loss.