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SunMar's Excel composting toilet is one of the most popular models of self-contained toilet available. It's a perfect size for regular household use, enabling your family to enjoy the convenience of an indoor toilet without the hassle or expense of installing a full septic system. When installed in a seasonal or weekend cabin, the Excel can be used by up to 6 adults, or a family of 8. For year-round residential use, SunMar recommends limiting regular use to up to 3 adults or a family of five. More from the manufacturer:

The SUN-MAR Excel is a high capacity, electric, self-contained unit. Long considered the standard in composting toilet performance, it is the preferred self-contained model for heavy cottage or for residential use. Like all Sun-Mar toilets the Excel incorporates a patented Bio-drum? which ensures a fast and odourless decomposition. ANSI/NSF-41 is the only composting toilet standard in North America, and only Sun-Mar toilets (including the Excel) are certified and listed by NSF for cottage and/or residential use. During extensive testing by NSF, the Excel was found to operate odourlessly, to produce a clean dry compost, and to evaporate all liquids. The Excel saves thousands of gallons of water while recycling waste into a safe useable soil. The unit is shipped fully assembled. To install, simply plug into a regular 110V outlet and connect the 2" vent stack supplied with the unit.