Centrex 3000 AF

The Centrex 3000 AF (Air Flow) is a continuous compost flow design for very heavy cottage or medium residential use. With a continuous flow system, rotation of the drum moves compost along the larger and longer 3000 series drum, before it drops automatically into the collection housing at the end of the unit. Under normal operating conditions the drum will not have to be turned backwards for emptying. When used seasonally by up to 10 adults, compost will normally only need to be removed annually at the beginning of the following season. The Centrex 3000 AF features a 370 watt 120 volt thermostatically controlled heater in a sealed compartment beneath the unit coupled with the standard Sun-Mar 30 watt turbo fan and 2" vent stack. The Centrex 3000 AF is designed for use with a Sun-Mar Dry Toilet. The AF Waterless Kit (purchased separately) contains a 41" pipe piece that is 10" in diameter and is used to connect the dry toilet to the Centrex unit. The pipe piece can be cut to size and additional pieces ordered if necessary. All 3000 series units are supplied with a 1" drain hose which should be connected to the 1" drain at the bottom left of the unit. This particular model should be able to evaporate all liquids as long as the heater is on, and it is not being used heavily, so an overflow drain may not be necessary. This unit is for use with a Dry Toilet, purchased separately.
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The Sun-Mar Centrex 3000 is an extra-high capacity unit designed for very heavy cottage use or heavy residential use. The Centrex 3000 is an electric unit for those with a constant electric supply. All Sun-Mar composting toilets incorporate a patented Bio-drum which ensures fast and odorless decomposition. Saves thousands of gallons of water, while recycling waste into soil. The unit is shipped fully assembled. A one pint flush toilet is required for use with this unit (sold separately). Seasonal capacity: 9 adults or families of 11. Residential use: 6 adults or families of 8. Other optional configurations available for this system include: 1) Waterless operation: This configuration requires the separate purchase of the Sun-Mar Dry toilet and the Sun-Mar A/F Waterless kit 2) Dual electric and non-electric operation: This configuration requires the separate purchase of the Sun-Mar AC/DC kit.

  • Uses little or no water
  • Recycles waste into fertilizing soil
  • No odor
  • Certified and listed by ANSI/NSF
  • Seat not included



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)

5 adults or families of 7

Seasonal/Vacation (Adults/Families)

8 adults or families of 10


Electricals must be connected while the unit is in AC use for proper operation

Maximum Amps (With Heater On)


Fan Watts (Required or Optional Hookup)

35 Required

Heater Watts (When Thermostat switches it on)


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


Vent & Drains

Vent Pipe

2" PVC Thinwall

1" Drains (Required or Optional Hookup)


Weights (Lbs.) & Dimensions

Unit Height & Depth

28" by 27"

Unit Width & Width Required to Turn

45 1/2" by 49"

Product Weight/Shipping Weight


Shipping Carton Dimensions (W by L by H)

28 1/2" by 60 1/2" by 36"

Depth Required to Remove Drawer

45 1/2"

Height to Bottom - Top of Waste Inlet Assembly

27 3/4 - 33"

Vent Inlet Center Distance From Rear - Left Side

24" - 37 3/4"

Waste Inlet Diameter (including flange)

10 3/4"

Height to Center of Top of Vent Outlet Assembly

24 3/4"

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