The Sun-Mar® Excel is a high capacity, electric, self-contained composting toilet. It is ideally suited for residential or heavy cottage use. Like all Sun-Mar® toilets, the Excel incorporates a patented Bio-drum™ which can be easily rotated and ensures a fast, odourless decomposition. The electrical features on the Excel are a thermostatically controlled heater in the base of the unit to assist with evaporating liquids, and a fan in the top rear which maintains a partial vacuum in the unit. It does this by drawing air over the evaporating chamber and up the vent stack. The Excel saves thousands of gallons of water while recycling waste into a safe useable soil. Like all Sun-Mar® self-contained units, the Excel is easy and quick to install. This makes it ideal for houses, cottages, cabins, pool houses, barns, greenhouses; in fact, anywhere you need a toilet. Its seasonal capacity is 6 adults or families of 8. Its residential use is 3 adults or families of 5.