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          Sun-Mar™ | Centrex 3000 - A/F (Air Flow) 240

          Manufacturer: Sun-Mar™
          SKU: SMC-3000 A/F 240
          The Sun-Mar Centrex system range is a split system, also known as an underfloor model. This means that the holding chamber is separate from the actual toilet pedestal itself. The major advantage of these systems is that they allow for greater holding capacity and therefore tend to be lower maintenance. If you have below-floor space for installation, then this is the range for you.

          Choose the Product options below


          Please select the primary pedestal (toilet fixture) option you would like to accompany your composting system.

          Note; that the Urine-Diversion (UD) pedestal option is most suitable where there is high use in peek or large family gatherings.

          Note; that with Urine Diversion, it is recommended that the compost mass is kept wet to avoid the pile drying out. Consider getting the hand-held bidet sprayer accessory for facilitating the hydration of compost.


          A hardwearing Nano-Ceramic Non-Stick Coating is applied onto the inner side of the Pedestal (toilet fixture) for maximum cleanliness.

          Note; basic cleaning will still be required.

          Note; non-stick is hydrophobic and repels liquids only.

          Add a wind-driven vent to create redundancy.
          The wind-driven vent will assist the fan under heavy wind conditions and keep the system going in case of power outage or fan failure.

          Select this reducing collar to adapt the wind-driven vent from 150mm to 100mm.

          Select this reducing collar adaptor to reduce the pipe further, from 100mm to 50mm. Compatible with this system.

          Note: to reduce to 50mm, the 100mm adaptor above is also required - leave selected.

          Note: systems with 50mm piping will require a mounting stay (not supplied).

          Extend your drain pipe to reach your soak pit/trench.

          The system is packed with 1 meter of 25mm leachate drain pipe as a standard.

          Most soakaways should be installed 3 meters away from the foundations of the structure but this remains circumstantial to the site.

          Run your leachate drain into a soak pit (vertical soak-away) or into a trench (horizontal soak-away).

          Availability: Availability - Special Order | (3-4 months, Estimated Time of Arrival(ETA))
          $5,652.17 excl GST
          excluding shipping
          Dispatch; Transport Time Frames: 1 Week Estimated Time of Freight (Nationwide-Transport)
          i h
          Product Files
          Complete Catalog | Split Systems (Under-floor)
          Sun-Mar™ | Media

           AVAILABILITY: this system is Special Order, please enquire about procurement timeframes 

          Perfect for medium to heavy seasonal or medium residential use, the Centrex 3000 allows for both a longer composting cycle and the largest compost 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.

          The Centrex 3000 works on a continuous rotation design to maximize its capacity and improve the composting process. The rotation of the BioDrum forces the compost along the length of the Centrex 3000 and into an auto-drop mechanism, which lets the compost fall into the collection tray. Unlike with the smaller Centrex 2000, the drum doesn’t have to be rotated backward for emptying. The drum handle can continually be rotated in a clockwise direction and allow the material to work along the drum and deposit in a separate collection box.

          The Centrex 3000 A/F is the waterless version of the popular Centrex range. In the A/F (AirFlow) model, the waste falls under gravity into the drum of the composter. In the case of the micro flush model the waste is transferred by the 500mL flush and multiple pedestals can be installed with one composter.

          Multiple toilets are not possible with the AF model as a straight fall is required.

          The Centrex 3000 A/F is a 240-volt unit as standard. The solar-compatible Centrex 3000 A/F NE version is a 12-volt (1.9-watt fan) version. See Link

          The Centrex 3000 A/F is supplied with a 1" drain hose which should be connected to the 1" drain at the bottom of the unit. This drain hose ensures any excess liquids are removed to a small subsurface gravel absorption trench.

          This large Centrex 3000 model will comfortably accommodate an eleven-person holiday house usage, requiring only one compost removal before and after the Holiday.

          In a residential capacity, the compost will have a different maintenance interval.

          ELECTRICAL RATING Maximum Amps (With Heater On) 3.6 Fan Watts (Required or Optional Hookup) 35 (Required) Heater Watts (When Thermostat switches it on) 370 Average Power Use in Watts (Heater on 1/2 time) 215
          DIMENSIONS 768 x 699mm x 1803mm
          FLOORSPACE REQUIRED Depth Required to Remove Drawer 1156mm Height to Bottom – Top of Waste Inlet Assembly 826mm Vent Inlet Center Distance From Rear – Left Side 959mm Waste Inlet Diameter (including flange) 250mm O/D to

          The Centrex 3000 A/F features a 370-watt thermostatically controlled heater in a sealed compartment under the unit and the standard Sun-Mar 30-watt turbofan to supply oxygen to the pile, with a 2" vent stack to remove evaporating liquid and eliminate all odors.

          The increased surface area in the evaporating chamber coupled with the larger heating element also provides better evaporation on electric units.

          When used seasonally by up to 7-9 adults, compost will normally only need removal annually each spring. In residential use, compost will have to be extracted more frequently.

          When used residentially by up to 4 adults, some compost will need to be emptied into the finishing drawer once every few months.

          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 Palisade and Pandora fixtures options only. 


          AS/NZS 1546.2:2008 - On-site domestic wastewater treatment units - Waterless composting toilets


          License Number. SMKH25591

          Against the AS/NZS 1546.2

          Under SAI Global


          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, odors, and solid end products


          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. 


          All Product short copy and long copy is the property of Waterless Composting Toilets NZ Limited. Copyright © 2023 WCTNZ® | Waterless Composting Toilets NZ. All rights reserved.