Sun-Mar Excel Composting Toilet

self-contained, certified composting toilet

The Excel by Sun-Mar is the best-selling composting toilet in North America and for good reason. It is a high capacity bio-drum toilet that is very simple to operate, features well-proven technology and is extremely reliable. The Excel was the first-ever self-contained composting toilet to be certified by the National Sanitation Foundation (NSF). So, when you purchase an Excel, you are literally purchasing a composting toilet that sets the standard.

The Excel has enough capacity that it can be used just about anywhere; in residences, cottages and even in light commercial applications.

To simulate residential use the Excel was tested by the National Sanitation Foundation (NSF) at maximum capacity for 6 continuous months, during which the Excel produced no odor and produced a clean, safe compost. Only Sun-Mar self-contained units are listed for residential and cottage use by NSF, whose Standard #41 is the toughest composting performance standard in the world.

The 2" vent is attached at the top back of the Excel and can be installed invisibly by running it through the wall and up the outside wall. For comfort, the Excel has a sturdy detachable footrest which can be removed to pull out the finishing drawer.

In normal use the Excel can generally evaporate all liquids, however an " emergency drain is fitted at the rear and this should be connected if the unit is to be used residential or heavily, or if prolonged power outages are expected.

Composting Capacity: 3-4 Residential 6-8 Weekend and Vacation Use.

SHIPPING NOTE: Please note we estimate $250 shipping cost, but will quote you the official cost once your order comes in. This product is currently backordered 5 to 6 weeks.


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.

Residential/Continuous (Adults/Families)

Residential/Continuous (Adults/Families) 3 adults or families of 5
Seasonal/Vacation (Adults/Families) 6 adults or families of 8


Maximum Amps (With Heater On) 2.4
Fan Watts (Required or Optional Hookup) 30 Required
Heater Watts (When Thermostat switches it on) 250
Average Power Use in Watts (Heater on 1/2 time) 150

Vent & Drains

Vent Pipe 2" PVC Thinwall
Drains (Required or Optional Hookup) 1/2" Drains, Optional Seasonal/Vac use, Required for Residential/Heavy Use

Weights (Lbs.) & Dimensions

Product Weight/Shipping Weight 60/100
Shipping Carton Dimensions (W by L by H) 28" by 36" by 36"
Depth Required to Remove Drawer 48"
Vent outlet center distance from the right side 10"
Height to the center of the vent 28 3/8"
Unit Height/Width/Depth 32" by 22 1/2" by 33"

Country of Manufacture: CA

Excel Specifications

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