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Sun-Mar™ | Centrex 3000 NE (Non Electric) - A/F (Air Flow)
The Centrex 3000 NE A/F is a high-capacity, low-voltage waterless underfloor composter designed for medium to heavy seasonal use and medium residential use. It is the off-grid alternative to the heated Centrex 3000 models and is intended for use with a waterless pedestal.
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. With a larger compost capacity than the Centrex 2000 A/F NE model, the 3000 NE A/F can comfortably accommodate up to 7 people in a holiday-house situation. In a residential capacity, compost needs to be emptied more frequently and it is suitable for up to 5 people.
Capacity and Best Fit
- Holiday / seasonal use: up to 7 people
- Residential use: up to 5 people
- Best suited to: larger off-grid cabins, holiday houses, and medium residential applications using a waterless pedestal
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 3000 NE A/F is the non-electric Air Flow version of the Centrex 3000. The system is designed for use in conjunction with a waterless toilet pedestal and processes waste under the bathroom floor. The non-electric system is slightly smaller than its electric counterpart, but still offers significantly larger compost capacity than the 2000-series NE A/F model.
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, so an overflow drain to a small sub-surface gravel pit is required.
A 100mm vent and low-voltage fan help to ensure that odours are dispelled with minimal electrical draw.
NSF 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 »