Updated on January 17, 2024


Created on August 28, 2017

Sun-Mar Excel NE Composting Toilet

Upcoming Update

The Sun-Mar Excel NE Composting Toilet is a dry composting system.

Developed By
  1. Sun-Mar
Tested By
  • National Sanitation Foundation (NSF)
  • Sun-Mar
Content Partners


Product Description

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.

Target SDGs

SDG 6: Clean Water and Sanitation

Market Suggested Retail Price


Target Users (Target Impact Group)


Distributors / Implementing Organizations

Sun-Mar sells online and has distributors all over North America and internationally.

Competitive Landscape

Manufacturing/Building Method

The toilet is constructed by hand by Sun-Mar.

Intellectural Property Type


User Provision Model

Direct sales, online and in-stores

Distributions to Date Status


Toilet type


Evacuation method


Storage conditions

Container-based storage

Capacity (L)


Time until emptying


Design Specifications

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. Aerobic breakdown is used in the composting process. The 3-chambered drum is patented by Sun-Mar and can be moved with a handle. The compost is manually emptied by the user.

Product Schematics

Technical Support

The user is responsible for service and maintainence of the product but the manufacturer offers a manual, FAQs and call support.

Replacement Components

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.

Evaluation methods

To become NSF (National Sanitation Foundation) certified the toilet had to meet the following six requirements: “The toilet system can handle the stated capacity for an extended period plus occasional overload; The toilet system has no offensive odors; The composted output has been demonstrated to meet required bacterial content levels; Advertising, literature and labeling are not misleading; Products undergoing testing are not accessible to the manufacturer; Lab test results are confirmed by parallel testing of toilet systems operating in the field.”

Other Information

Distributors in North America can be found here and a list of international distributors can be found here. A video with an example of how a toilet is produced can be found here. Sun-Mar has an international patent on technology. The Sun-Mar NSF certification can be found here.    

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