The BDT250 has a durable, Teflon coated, compact aluminum base in a low-profile design. Fins provide largesurface area to make the unit run cooler while putting out the same amount of heat as conventional de-icers. Channels within the base promote water flow as the water is heated. Cooler running, Teflon coating, and flowing water all combine to reduce mineral buildup. Multiple thermostats allow efficient control while providing over-temperature protection. The BDT250 is safe to use in plastic bird baths and comes with a 10-foot cord.