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    SKU: SM-EXCN-FT
    Excel NE — non-electric high-capacity self-contained composting toilet for off-grid sites where you want Excel-style capacity without relying on mains power.

    Choose the Product options below

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    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.

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    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: 2 in stock
    $4,041.32 excl GST
    excluding shipping
    Estimated delivery time: Approx. 1–2 weeks (NZ-wide)
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    Sun-Mar™ | Media

    Sun-Mar™ Excel NE

    Designed for 2 people full-time and suited to higher part-time or seasonal use, the Sun-Mar™ Excel NE is a strong choice for baches, sleep-outs, cabins, and similar locations where there is no access to a reliable power supply.

    Featuring Sun-Mar’s™ patented Bio-drum™ technology, the Excel is a true composting system that processes compost in two stages within the unit itself. The Excel NE differs from powered models because it is designed to operate without a fan or heater as standard.

    Capacity and Best Fit

    • Full-time use: 2 adults or families of 3
    • Seasonal / vacation use: 5 adults or families of 7
    • Best suited to: cabins, baches, and off-grid sites where there is no reliable mains power

    Core Product Details

    • Non-electric composting design with no fan or heater required as standard
    • 4" PVC vent pipe supplied
    • 1" drain required and supplied
    • Optional 12V or 24V fan can be added where performance support is needed
    • Designed to work best with a straight vertical vent and good airflow

    Performance and Certifications

    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 the NSF under this stringent standard. Testing is conducted for 6 months at an NSF-recognised, independent testing laboratory under a strict protocol.

    To be certified, the unit must operate odour-free at maximum capacity and produce clean, safe compost.

    NSF: What you need to know about composting toilets

    NSF Fact Kit

    Note: the system does not include a starter pack. Please purchase bulking agent, microbes, and enzymatic cleaner separately.

    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 »

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