I believe they're continually heated. At least every one I've seen is labeled "heated probe" or the like which probably wouldn't be necessary if they had to be

I believe they're continually heated. At least every one I've seen is labeled "heated probe" or the like which probably wouldn't be necessary if they had to be manually de-iced. http://www.flightglobal.com/blogs/flightblogger/pitot-tubes_sm.jpg http://www.flightglobal.com/blogs/flightblogger/pitot-tubes_...