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Sun-Mar™ | Centrex 2000 - M/F (Micro Flush) 240
Perfect for medium to heavy seasonal or light residential use, the Centrex 2000 M/F 240 gives you a longer composting cycle and a larger compost volume than smaller systems, while allowing a micro flush pedestal arrangement.
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. The 240V M/F version is the electric micro flush model, designed to give users a flush-style interface while still moving waste into a larger underfloor composting chamber.
When used seasonally by up to 7–9 adults, compost will normally only need removal annually each spring. When used residentially by up to 4 adults, some compost will need to be emptied into the finishing drawer once every few months.
Capacity and Best Fit
- Holiday / seasonal use: up to 7–9 adults
- Residential use: up to 4 adults
- Best suited to: underfloor micro flush installations where reliable 240V power is available
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 M/F 240 is the electric micro flush version of the Centrex 2000 range. Waste is transferred into the composter by the micro flush pedestal, while the underfloor chamber uses Sun-Mar’s™ staged composting process to manage and mature the material.
The electric version benefits from a stronger evaporation process due to the larger heating element and increased evaporating-chamber surface area. This improves performance compared with the non-electric model where liquid management relies more heavily on drainage.
The unit is supplied with a 1" drain hose which should be connected to the 1" drain at the bottom of the unit. A 50mm vent and low-voltage fan help to ensure that odours are dispelled with minimal electrical draw.
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 »