Sunmar

Sunmar has been making composting toilets since 1971, and they're our go-to recommendation for off-grid cabins, camps, and homes where conventional plumbing doesn't make sense. Their self-contained units are NSF-certified, use little or no water, and turn waste into safe, useful compost through a patented bio-drum process—no septic system, no chemicals, no holding tank.

The Excel handles full-time residential use, the Compact suits smaller spaces and weekend cabins, and the non-electric Excel runs off a vent stack alone when you're truly off the grid. Add Compost Sure bulking material and Compost Quick microbial accelerator, and you've got everything you need to keep the system running clean.