AVAILABILITY: Special Order—Call to Enquire 

Perfect for medium to heavy seasonal or light residential use, the Centrex 2000 allows for both a longer composting cycle and a larger compost waste volume

Featuring Sun-Mar's™ patented Bio-drum™ technology, the Centrex is a true composting system that processes the compost in two stages within the unit itself.

Whilst not as large as the Centrex 3000, the 2000 A/F NE model still comfortably accommodates a seven-person holiday house usage, requiring only one compost removal annually. In a residential capacity, the compost will need to be dealt with more frequently.

There is no heating unit in this model so it will operate beautifully on solar or mains power. Without the heater, the evaporation process is not as effective as in the 240-volt system. Therefore an overflow drain to a small sub-surface gravel pit is required (200x40x40cm).

The Centrex 2000 is supplied with a 1" drain hose which should be connected to the 1" drain at the bottom of the unit. 

Whilst not as large as the Centrex 3000, the Centrex 2000 NE (Non-Electric) - A/F (Air Flow) model still comfortably accommodates a seven-person holiday house usage, requiring only one compost removal annually. In a residential capacity, the compost will need to be dealt with more frequently.

A 100mm vent and low voltage fan help to ensure that odors are dispelled with a minimal electrical draw.

ELECTRICAL RATING Fan Watts (Required or Optional Hookup) 0.5 (Required) Amps
DIMENSIONS 730mm x 1200mm x 770mm
FLOORSPACE REQUIRED Height to Bottom – Top of Waste Inlet Assembly 749m m Vent Inlet Center Distance From Rear – Top Side vent outlet position 

Capacity Notes

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.

Fixture Notes

The Sun-Mar Centrex AirFlow Systems come with Polymarble fixture options only. 

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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