The Sun-Mar Excel NE is a self-contained composting dry toilet made for off the grid circumstances. The excreta is dried/evaporated and composted within the units 3 chamber drum for continuous composting. It is sized for household use.
The toilet is constructed by hand by Sun-Mar. A video with an example of how a toilet is produced can be found here.
Intellectural Property Type
User Provision Model
Direct sales, online and in-stores
Distributions to Date Status
Time until emptying
The toilet is self-contained, made of plastic, and has three chambers for different stages in the composting process (composting chamber, evaporation chamber, finishing chamber). A manually driven drum rotates the chambers and mixes the compost material. The toilet is made for use by two adults or families of three in permanent housing. Detailed measurements and design specifications can be found here. Aerobic breakdown is used in the composting process.
Replacement components can be ordered via the Sun-Mar webshop or found at other retailers.
Sun-Mar has a 5 year warranty on the fibre glass tank and a 3 year warranty on all other parts.
Manufacturer Specified Performance Parameters
The manufacturer states odorless, easy to use, quick to install, and no pollutants or chemicals released to the environment as important performance targets of the toilet.
Vetted Performance Status
The tests done for NSF (National Sanitation Foundation) certification demanded that the toilet fulfilled the criteria for odors, bacterial levels and could handle the stated capacity for an extended period plus occasional overload.
No safety issues related to the product, when properly handled.
Complementary Technical Systems
12 Volt fan and a solar panel.
Academic Research and References
Compliance with regulations
Sun Mar is NSF certified for liquid containment, odors, and solid end products. This standard is the National Sanitation Foundation NSF/ANSI standard nr 41, 2005.