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Sun-Mar™ | Centrex 3000 - M/F (Micro Flush) 240
The Centrex 3000 M/F 240 is the electric micro flush version of the largest Centrex range. It is designed for use with a micro flush pedestal and is positioned for medium to heavy seasonal use and medium residential use where the greatest compost volume is needed.
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. The Centrex 3000 composting toilet works on a continuous flow design to maximize its capacity and improve the composting process.
Capacity and Best Fit
- Best suited to: medium to heavy seasonal use and medium residential use
- Application type: underfloor micro flush installations where larger compost volume and reliable 240V power are available
- Pedestal type: micro flush 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 composting toilet works on a continuous flow design to maximize capacity and improve the composting process. The rotation of the drum forces compost along the length of the Centrex 3000 and into an auto-drop mechanism, which lets the compost fall into the collection housing.
All Centrex 3000 electric units feature a 370-watt 120-volt thermostatically controlled heater in a sealed compartment beneath the unit, coupled with the standard Sun-Mar 30-watt turbo fan and 2" vent stack. This heater assists in the evaporation of liquids, reducing the amount of effluent from the unit. The fan also removes fresh odours from the unit, ensuring odour-free operation.
NSF and CSA Performance Certification
Sun-Mar™ composting toilet systems are CSA certified for electrical features under CSA file number LR55925.
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 »