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    Sun-Mar™ | Centrex 3000 NE (Non Electric) - A/F (Air Flow)

    Manufacturer: Sun-Mar™
    SKU: SMC-3000 NE A/F
    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.


    Choose the fan voltage to match your power system. 

    ABS pipe (US spec) is supplied with the toilet. This is suitable for straight horizontal vent stacks.

    If you'd like to adapt the unit to NZ pipe, please select this kit. You will need NZ pipe if you're looking to create elbows and bends.


    You may need additional vent materials depending on how many storeys your building has.

    Single Storey buildings with a high-profile roof (A frame or mono-pitch) require extra lengths of vent pipe - add one 830mm Vent Pipe Extension

    Double Storey buildings require extra lengths of vent pipe. Please add 4 x 1m Vent Pipe Extensions.

    Double Storey building with a high-profile roof (A frame or mono-pitch) require extra lengths of vent pipe - add one 830mm Vent Pipe Extension

    Kit for stepping the vent stack around the eaves of the roof. Allows you to avoid penetrating the roof.

    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.

    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))
    $5,478.26 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 NE (Non Electric) - A/F (Air Flow) is a high capacity, low voltage, waterless “off-grid” alternative to the straight Centrex 3000 (heated) models. 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.

    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, the compost needs to be emptied more frequently and is suitable for up to 5 people.

    There is no heating unit in this model so it will operate beautifully on solar or mains power. Without the heater, the evaporation process is not as effective as in the 240-volt system. Therefore an overflow drain to a small sub-surface gravel pit is required (200x40x40cm).

    A 100 mm vent and low voltage fan help to ensure that odours are dispelled with minimal electrical draw.

    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.


    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


    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.