Behlen's one-piece, heavily insulated waterers, poly design is rust and corrosion free. Thick styrofoam floor keeps the frost line below the waterer. Extra urethane in the walls provides over four times the insulation of competitors’ models. 100 watt infrared heat pad directly under the water trough (starts at approx. 42°F). Heat pads are totally isolated from the animal to prevent danger from shock.