Designed for 2 people (full-time) and up to 6 (part-time), the Sun-Mar Excel NE is a fantastic choice for baches, sleep-outs, cabins, or any location where there is no access to a reliable power supply
Featuring Sun-Mar's™ patented Bio-drum™ technology, the Excel is a true composting system that processes the compost in two stages within the unit itself.
Because the Excel NE model requires no fan or heater, it is perfect for those who have no access to 240vAC power, or even a 12-volt power supply. The clever design utilizes a diffusor at the top of the unit which draws away any odour from the toilet in much the same way that a chimney draws smoke from a fire.
The systems pipe should be installed in a straight vertical line in order to optimize airflow and sit at least 600 - 1000mm above the roof.
If the toilet is to be used full time in a home, if there are bends in the pipe, or if the location of the toilet is especially predisposed to downdrafts, it is recommended that an optional 12v, 1.9watt fan be installed to help optimize performance and reduce the likelihood of any odour. If required, this 12v fan can easily be powered through a simple solar set-up. Waterless Composting Toilets NZ offers cost-effective solar solutions to complement this model if required.
As this system has no heating pads, the included drainpipe must be installed to help the system cope with any excess moisture build-up in the chamber and ensure that the unit is still able to function at its optimum level.
CAPACITY: Residential/Continuous (Adults/Families) 2 adults or families of 3 Seasonal/Vacation (Adults/Families) 5 adults or families of 7
ELECTRICAL RATING:12 or 24 volt optional
DIMENSIONS:711mm x 902mm x 914mm
FLOORSPACE REQUIRED:800mm x 572mm x 851mm
Capacity Listed capacities refer to the number of people, on average, using the unit per day. Do not pick a unit that is below your capacity.
Residential/Continuous (Adults/Families) 2 adults or families of 3
Seasonal/Vacation (Adults/Families) 5 adults or families of 7
Electricals
Maximum Amps (With Heater On) N/A
Fan Watts (Required or Optional Hookup) 1.9 (12 or 24 volts DC optional)
Heater Watts (When Thermostat switches it on) N/A
Average Power Use in Watts (Heater on 1/2 time) N/A
Vent & Drains
Vent Pipe 4″ PVC Thinwall (supplied)
Drains (Required or Optional Hookup) 1″ Drain, Required Use (supplied)
Weights & Dimensions
Shipping Weight 50kg
Shipping Carton Dimensions (L by W by H) 902mm x 711mm x 914mm
Depth Required to Remove Drawer 116cm
Vent outlet center distance from right side 286mm
Height to the center of vent N/A
Unit Length/Width/Height 851mm x 572mm x 800mm
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NSF/ANSI 41 Standard - Non-Liquid Saturated Treatment Systems
This system is Certified for liquid containment, odors, and solid end products
THERE IS ONLY ONE PERFORMANCE STANDARD FOR COMPOSTING TOILETS IN NORTH AMERICA. THIS IS NATIONAL SANITATION FOUNDATION NSF/ANSI STANDARD #41.
Sun-Mar is certified by the NSF under this stringent standard. Testing is conducted for 6 months at an NSF recognized, independent testing laboratory under a strict test protocol.
To be certified, the unit must operate odor-free at maximum capacity (including overload conditions) and produce clean, safe compost.
What you need to know about Composting Toilets
As additional verification, NSF obtains and tests additional compost samples from randomly selected field operations, and conducts interviews with the users of these units. For verification, please check the NSF website.
NSF International is a not-for-profit, non-governmental organization. It is the world leader in standards development, product certification, education, and risk management for public health and safety, and for 75 years has been committed to public health, safety, and protection of the environment.
WCTNZ® is the exclusive authorized distributor of Sun-Mar™ composting toilets in New Zealand. All Sun-Mar™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties, and come with comprehensive local customer support—making us New Zealand’s trusted source for sustainable, waterless composting toilet solutions.
Copyright © 2025 Waterless Composting Toilets NZ Limited (WCTNZ®). All short and long product descriptions and content are the property of WCTNZ® | Waterless Composting Toilets NZ. All rights reserved.
This content has been reviewed and approved by Dylan Timney, Managing Director of WCTNZ®, who brings over 17 years of composting toilet expertise and 16 years of experience in building and eco-construction in New Zealand.
Last reviewed: June 26, 2025
