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Despite what is recommended I had to use it with an extension cord. It works well and keeps the water fluid. Its early in the winter yet (tested to -15C) so I'm not exactly confident that at -30C it will work but so far so good. I covered the cord with a rubber tube (cut it lengthwise) to prevent any curious damage from pecking through the insulation.
This heater is only good to temperature of -10 to -12°C in a wind free and covered environment. Any colder than that the plate of the metal waterer gets a thick layer of ice and the chicken cannot drink. I hope there is better out there.
Loved it, for the 3 months it worked and now, during our coldest days of the year, it stopped working. I've had frozen chicken water 2 days in a row now and the base isn't even the slightest bit warm. Chexked my outlet and it is working fine. For the price, it should last longer than 3 months.