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    Sun-Mar™ | Centrex 2000 NE (Non-Electric) - A/F (Air Flow)

    Brand: Sun-Mar™
    SKU: SMC-2000 NE A/F
    Centrex 2000 NE A/F — non-electric underfloor Air Flow split system for medium to heavy seasonal use or light residential use, designed for a straight-fall waterless pedestal setup.

    Choose the Product options below

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    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 800mm 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 800mm Vent Pipe Extension

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

    A wind-driven vent offers the best redundancy for your system ventilation. The wind-driven vent will assist the fan under heavy wind conditions, keeping the system operational in the event of a power outage or fan failure.
    SharkVent™ | Wind Ventilator has high efficiency with a linear wind direction windvane (good for storm-prone areas).
    Universal Vent ACC | Wind-Driven Vent has high efficiency in low windage. 2 colours: white or black.

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

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

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

    Extend your soft connection leachate drainpipe to reach your hard connection leachate drainpipe or soak-pit/trench.

    Soft connections allow for flexible placement of the composting tank in relation to a hard connection or drain.

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

    Extend your leachate drain via in-ground hard connection to reach your soak-pit/trench (soak-away).

    Most soak-aways 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 - on backorder and will be dispatched once in stock (Special order – ready in approx. 3–4 months (non-stock item sourced specially from our supplier)).
    $8,175.05 excl GST
    excluding shipping
    Estimated delivery time: Approx. 1–2 weeks (NZ-wide)
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    Availability: Special Order — enquire with WCTNZ® about current procurement timeframes.
    Sun-Mar™ non-electric waterless underfloor composting system

    Sun-Mar™ | Centrex 2000 NE — Air Flow

    A non-electric underfloor composting system for medium-to-heavy seasonal use and light residential applications using a straight-fall waterless pedestal.

    The Centrex 2000 NE Air Flow provides a larger composting chamber than Sun-Mar™ self-contained toilets while retaining an off-grid, low-power operating pathway.

    Seasonal use
    Around 7
    Holiday-house positioning
    Fixture
    Air Flow
    Straight-fall waterless pedestal
    Heating
    None
    Non-electric composting chamber
    Ventilation
    100mm
    Low-voltage fan support
    Product background

    A larger composting chamber below the bathroom floor

    The Centrex 2000 separates the toilet fixture from the main composting chamber.

    Waste enters the BioDrum™ below floor level, providing greater composting volume while leaving a separate dry pedestal in the bathroom above.

    How it works

    Receive, compost and collect

    Stage 1 Receive

    Waste falls directly from the waterless pedestal into the BioDrum™ below the floor. The Air Flow configuration requires a direct vertical drop.

    Stage 2 Compost & manage moisture

    BioDrum™ rotation mixes and aerates the composting material. Ventilation supports airflow and moisture removal while the drain manages excess liquid.

    Stage 3 Finish & collect

    When material is ready to leave the BioDrum™, the Centrex 2000 collection pathway transfers compost into the finishing tray for removal.

    Installation geometry

    Air Flow requires a straight fall

    Because waste moves into the Centrex chamber by gravity, the pedestal must be positioned directly above the composting unit.

    Underfloor space and toilet position therefore need to be considered before the building layout is finalised.

    Pedestal pathway: the supplied product information identifies compatible Sun-Mar™ waterless pedestal options for the Air Flow configuration.
    Ventilation and drainage

    Non-electric chamber with liquid-management support

    • No chamber heating unit.
    • 100mm ventilation pathway.
    • Low-voltage fan supports airflow and odour management.
    • 1-inch drain hose connects to the drain at the bottom of the chamber.
    • Overflow liquid is directed to the applicable subsurface liquid-management pathway.
    Certification

    NSF and AS/NZS certification evidence

    NSF/ANSI 41 — Non-Liquid Saturated Treatment Systems

    The supplied certification material identifies independent performance testing under the NSF pathway.

    AS/NZS 1546.2:2008 — Waterless composting toilets

    SAI Global Licence Number: SMKH25591

    NSF: What you need to know about composting toilets

    NSF composting toilet information

    WCTNZ® is an authorised New Zealand supplier of Sun-Mar™ composting toilet systems. Local support is available for system selection, installation information, consumables and after-sales requirements.

    Air Flow or Micro Flush?

    Air Flow is the fully waterless straight-fall Centrex pathway. Micro Flush provides greater flexibility in pedestal position and a flush-style user interface.

    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 »