The Sun-Mar® Centrex 2000-NE is designed for medium to heavy cottage or light residential use. The Centrex 2000-NE is a non-electric unit for those with no continuous 110 volt power supply. All Sun-Mar® composting toilets incorporate a patented Bio-drum™ which ensures fast and odourless decomposition and saves thousands of gallons of water while recycling waste into safe usable soil. This unit is shipped fully assembled and is used with either a Sun-Mar dry toilet or an ultra low water flush toilet (sold separately. When used with a Sun-Mar® toilet, a separate AF waterless kit is required. Its seasonal capacity is 6 adults or families of 8, its residential capacity is 3 adults or families of 5.