I made my own heated hose, using heat tape wrapped along the length of the hose, then covered with rubbery pipe insulation (not the stiff foam, but a much softer form, that I found at Lowe's). Once sealed, and properly set up, the hose never froze. I also insulated the stand pipe, and put a short heat tape (Heat tape is used to line the eaves in snowy country to prevent ice dams) on it. Everything ran tot he power pole, at the 20 amp plug.
Works great, and never had a freeze. Used it down to 20 degrees, but never had to use it below zero.
While people were out with their hair dryers trying to break loose their hoses, I was enjoying a shower.