The SUN-MAR Excel is a high capacity, electric, self-contained unit. It is ideally suited for heavy cottage or residential 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 on the unit. It does this by drawing air in 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 cottages, cabins, pool houses, barns, greenhouses; in fact anywhere you need a toilet.