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Sun-Mar™ | Centrex 2000 NE (Non Electric) - A/F (Air Flow)
Perfect for medium to heavy seasonal or light residential use, the Centrex 2000 NE A/F allows for both a longer composting cycle and a larger compost waste volume than smaller systems, while remaining well suited to lower-power or off-grid installations.
Featuring Sun-Mar’s™ patented Bio-drum™ technology, the Centrex is a true composting system that processes 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, typically requiring only one compost removal annually. In a residential capacity, the compost will need to be dealt with more frequently.
Capacity and Best Fit
- Holiday / seasonal use: comfortably suited to around 7-person holiday-house usage
- Residential use: light residential use, with more frequent compost management
- Best suited to: off-grid baches, cabins, and underfloor waterless installations where low electrical draw is preferred
Capacity note: Listed capacities refer to the number of people, on average, using the unit per day. Do not pick a unit that is below your real use case.
How this system works
The Centrex 2000 NE A/F is the non-electric Air Flow version of the Centrex 2000. In the A/F model, the waste falls under gravity directly into the drum of the composter. This makes it a true waterless underfloor system, but it also means a straight fall is required.
There is no heating unit in this model, so it will operate well on solar or mains-supported low-voltage arrangements. Without the heater, the evaporation process is not as effective as in the 240-volt system. Because of this, an overflow drain to a small sub-surface gravel pit is required.
The Centrex 2000 is supplied with a 1" drain hose which should be connected to the 1" drain at the bottom of the unit. A 100mm vent and low-voltage fan help ensure that odours are dispelled with minimal electrical draw.
Fixture note: The Sun-Mar Centrex AirFlow Systems come with Sun-Mar™ Dry Toilet Elongated Pedestal or Premium Pedestal - The Polymarble options only.
Performance Certification
NSF/ANSI 41 Standard — Non-Liquid Saturated Treatment Systems
This system is certified for liquid containment, odours, and solid end products.
Sun-Mar is certified by NSF under a six-month independent test protocol requiring odour-free operation at maximum capacity and the production of clean, safe compost.
Certification
Australian & New Zealand Standard 1546
SAI Global certified
Licence Number: SMKH25591
Sun-Mar™ Composting Toilet Systems are certified against the "AS/NZS 1546.2:2008 On-site domestic wastewater treatment units – Waterless composting toilets" standards.
NSF: What you need to know about composting toilets
WCTNZ® is the exclusive authorised 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.
Before you choose, think:
1. Your place — tiny home, bach, family home, RV, or public site
2. Your building — whether it suits a self-contained or split composting toilet system
3. Your needs — user numbers, maintenance preferences, and how off-grid you want to be
To narrow it down properly, start with the Composting Toilet Guide.
Open the WCTNZ® Selector Guide »
