this will be my 1st winter w/ chickens. i have been useing plastic waterers, but i guess i'll be switching to the metal waterer & heated metal base soon, as things get very cold in a hurry around these parts. i'm concerned about the heated base and the woodshavings on the floor. will the base get hot enough to start a fire? i would assume they are made in such a way as to NOT be a fire hazard, but i am a little worried. can someone set my mind at ease? also...does anyone know if they make a hanging waterer that is heated? it seems that something like that would be safer, but i have never seen one.