The other day the lamp for keeping the waterer warm was blown and so I replaced it with another 100W bulb. In the evening I noticed the familiar smell of something melted as soon as I walked into the chicken coop. To my surprise, the new bulb burst and the waterer was partially melted by the heat. I cannot explain what happened but eveyrthing is gone. Thank God there was no fire and only the breaker and waterer had to be replaced.