OK, I have a new 1 Qt heated water bowl, 25 watts with thermostatic plug from Farm Innovators. Plan was to hook it to extension cord and run it to the coop for the winter--didn't get a line buried before the ground froze. Cord will be in PVC pipe. Sticker on bowl says " do not use with extension cord" Yeah so I don't want to because I always follow all directions at all times , but DH says no big deal, they have to say that, and it's only 25 watts. What do y'all think?