Sun-Mar Toilet Excel N/E

The success of the Excel design meant that a three chamber unit could be specifically designed for those with NO continuous 110 volt supply. First launched in 1981, the Excel NE has long been the standard toilet for those living off the grid. A 1998 redesign gave the unit a rounded look, and recessed the drum handle. The Excel NE has no fan or heater. Odorless operation is achieved by a 4" vent mounted at the top rear of the unit which acts like a chimney on a wood stove. For good air movement the vent should be installed vertically and to 2-3 feet above the peak of the roof. The optional 12 Volt Fan should be installed if you need to install the toilet with any bends in the vent. No more than 2 45° bends are encouraged, even with the fan. If the Excel NE is used residentially or heavily, or is in a place which is subject to downdraft, the optional 12 volt fan should be installed in the vent stack. This fan draws 1.4 watts and can be powered by a solar panel and 12 volt marine battery. Evaporating capacity on the Excel NE is variable, so the 1" drain at the rear should be connected to an approved drain pit, container, or other facility. Please click here for more information on handling excess liquid.
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Since 1981, the Sun-Mar Excel non-electric self-contained composting toilet has been a reliable and easy-to-use waste recycler for those living off the grid or for those who just want to live a green existence. This high-capacity waterless commode utilizes a patented Bio-drum that hastens odorless decomposition without a fan, heater, water supply or sewer connection. It includes a 4 in. diameter rear vent which, with extra piping, can be extended up through the roof to direct odors outside.

  • Ideal for a cottage, camp, cabin, barn, camp, pool house, greenhouse or yurt
  • No electricity, sewer or water connection required (recycles waste into soil)
  • Optional Sun-Mar 12 V ventilation fan (sold separately) can be powered by marine battery or solar panel
  • Certified and listed by the National Sanitation Foundation in accordance with Standard 41 composting capability (first toilet in its class to merit this distinction)
  • Produces zero odors and zero pollution
  • Outfitted with 1 in. rear drain for excess liquids
  • Seasonal capacity intended for 5 adults or families of 7
  • Can be used in a residential setting intended for 2 adults or families of 3
  • Comes fully assembled



Listed capacities refer to the amount of people, on average, using the unit per day. Do not pick a unit that is below your capacity.

Residential/Continuous (Adults/Families)

2 adults or families of 3

Seasonal/Vacation (Adults/Families)

5 adults or families of 7


Maximum Amps (With Heater On)


Fan Watts (Required or Optional Hookup)

1.4 (12 volt optional)

Heater Watts (When Thermostat switches it on)


Average Power Use in Watts (Heater on 1/2 time)


Vent & Drains

Vent Pipe

4" PVC

ThinwallDrains (Required or Optional Hookup)

1" Drain, Required Use

Weights (Lbs.) & Dimensions

Product Weight/Shipping Weight


Shipping Carton Dimensions (W by L by H)

28" by 35 1/2" by 36"

Depth Required to Remove Drawer


Vent outlet center distance from right side

11 1/4"

Height to center of vent


Unit Height/Width/Depth

31 1/2" by 22 1/2" by 33 1/2"

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