Thrifty King insulates the water so well that you can make it through the winter without supplying heat in many areas, and it takes little electricity in those areas where the winter is severe or energy free requirements are not met. The water is completely surrounded by fully insulated polyethylene plastic – including an insulated elliptical enclosure covering the drink areas. The covered water keeps the water cooler in summer and reduces loss of water due to evaporation. The closure also protects against mosquitoes breeding, lowering the risk of the spread of West Nile Virus. The CT6 provides 6 drinking areas ideal for a fence line or in a large pen or pasture. Summer cover standard for the warmer months.