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CENTREX 3000 AF AC/DC Extra High Capacity Combination Electric/Non-Electric Central System (Waterless)
Centrex 3000 AF AC/DC extra high capacity composting toilet by Sun-Mar

Toilet fixtures sold SEPARATELY.

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Product Code: CENTREX_3000_AF_ACDC
Our Price: $2,834.00
$200 Rebate Available!

Availability: Usually Ships in 1 to 2 Weeks


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How to Operate the CENTREX 3000 AF AC/DC
Product Features
Technical Specs
Return Policy

CENTREX Central systems are great for applications where a traditional bathroom look is desired and there is a place to put the central composting unit directly below the toilet. It is important to understand you are purchasing the central composting unit that is installed on the lower level; the toilet fixture to be installed in the bathroom is sold separately.

These are extra high capacity units designed for very heavy periodic use or medium heavy daily use. CENTREX 3000 central systems incorporate Sun-Mar's Auto-Flow technology, meaning that as the drum rotates, finished compost moves automatically through the drum and into a separate collection chamber at the end of the unit, making finished compost removal easier than ever!

This is a hybrid waterless central system that can operate with or without electricity. When 110 volt electricity is present, the thermostatically controlled heater helps to warm and evaporate liquid, while the fan assembly maintains a partial vacuum within the unit for odorless operation. When electricity is not present, the unit will default to the 4" vent stack, which constantly draws air upward and out to also ensure no odor. A 2.4 watt 12 volt fan is also included, and should be installed in the vent stack to aid in the venting process (please note, power source not included). The CENTREX 3000 AC/DC is perfect for homes who have no electricity now but expect to in the future, or who are using generators for more than 8 hours per day. This system is also a good option if you live in an area that experiences frequent power outages.


All CENTREX 3000 family systems have been tested by the National Sanitation Foundation (NSF) and are certified to comply with NSF-ANSI Standard #41, the only North American performance standard for composting toilets. The NST only certifies composting toilet systems that are odorless and that produce clean, sanitary finished compost. Visit the NSF website to see the CENTREX 3000 family's NSF Certification Listings.

Guide to Operation of the CENTREX 3000 AF AC/DC:
  • When you initially start using your system, add some Compost Sure (peat bulking material) into the Bio-Drum™ and some Microbe Mix.
  • Use any toilet paper you want, this system can handle it problem free.
  • For ongoing use, add a cupful of Compost Sure per person, per day of use. Then every 2-3 days during use, rotate the drum 5 or 6 full revolutions. For weekend use, just rotate before you leave at the end of the weekend.
  • The unique Auto-Flow technology of the CENTREX 3000 AF AC/DC means that as compost becomes finished, it will automatically drop into the collection chamber on the right side of the unit where it is kept separate from fresh material. The drawer on the collection chamber can be easily pulled out by hand to remove compost; no tools are required to open it.
  • After emptying the collection chamber, the compost should be moved into another bin where it can sit for 6 months to become fully finished and sanitized, before it is used.
  • The finished product is clean, dry, non-offensive, and sanitary. It will look and smell just like any other regular compost that might come out of a garden composter.

Composting Toilet

  • Central system that does not use water, works with or without electrical source.
  • Please note, the Centrex 3000 AF AC/DC is comprised of the Centrex 3000 standard electric water flush unit plus the AC/DC Conversion Kit and the AF Waterless Conversion Kit. See Instruction Manuals below for more information.
  • Requires a dry toilet, SOLD SEPARATELY.
  • Features extra large patented Bio-Drum™ for composting capacity of 9 adults (weekend use, when operating electrically).
  • NSF tested and certified for a continuous 6 months at maximum rated capacity (click here to view NSF certification).
  • Electrical features include a thermostatically controlled heater to evaporate liquid and a fan assembly to maintain a partial vacuum to ensure odorless operation at all times.
  • When electricity is not present, the 4" Vent stack maintains a partial vacuum, also preventing any odor.
  • Comes complete with a a 2.4 watt 12 volt fan that fits in the vent stack to improve venting (please note, power source not included).
  • All Centrex 3000 Family units feature 3-chamber technology that is unique from other Centrex central systems:
    • The patented Bio-Drum™ - compost is mixed and aerated
    • The Evaporating Chamber - excess liquid is evaporated
    • The Collection Chamber - finished material automatically flows and can be removed easily when needed.

Composting Toilet

Technical Specs:
  • Designed for use with dry toilet, SOLD SEPARATELY
  • Only one toilet can be installed on the CENTREX 3000 AF AC/DC system, because the toilet must be installed directly above the central composting unit
  • View Dimensional Line Drawing
  • View Centrex 3000 Instruction Manual
  • View AC/DC Conversion Kit Instruction Manual
  • View AF Waterless Conversion Kit Instruction Manual
  • Composting Capacity When Operating Electrically:
    • Residential & Continuous Use: 5 Adults or a Family of 7
    • Weekend & Vacation Use: 8 Adults or a Family of 10
    • Please note, family numbers above include both adults and small children
  • Composting Capacity When Operating Non-Electrically:
    • Residential & Continuous Use: 5 Adults or a Family of 7
    • Weekend & Vacation Use: 7 Adults or a Family of 9
    • Please note, family numbers above include both adults and small children
  • Electrical:
    • Max Amps (with heater on): 3.6
    • Fan Watts: 35
    • Heater watts (when thermostat switches it on): 370
    • Average Power Use in Watts (heater on 1/2 time): 200
  • Vent & Drains:
    • Vent Pipe: 2" Cent. Vac. tubing and 4" sewer pipe
    • Drain: 1" O.D. (Note: drain hookup is required on this unit)
  • Dimensions:
    • Unit Dimensions: 71" W x 27-1/2" D x 30-1/4" H (Note: This does include the Collection Chamber, which accounts for 13-1/2" of the 71" overall width)
    • Dimensions of Shipping Carton for Main Unit: 60-1/2" L x 28" W x 36-1/2" H
    • Dimensions of Shipping Carton for Collection Chamber: 24" L x 16" W x 23" H
  • Rough-in Measurements:
    • Depth required to remove finishing drawer: 45-1/2"
    • Height from base of unit to top of waste inlet assembly: 35-1/2" (Note: Waste inlet is the "collar" at the top of the unit that the toilet drain connects into)
    • Diameter of waste inlet (including flange): 10-3/4"
    • Distance from rear of unit to 2" vent inlet: 24"
    • Distance from left side of unit to center of 2" vent inlet: 37-3/4"
    • Distance from rear of unit to 4" vent inlet: 19-1/4"
    • Distance from left side of unit to center of 4" vent inlet: 37-3/4"
    • Height to center of 2" vent outlet assembly: 24-3/4"
    • Height to top of 4" vent outlet assembly: 33"
  • Unit shell is constructed of durable fiberglass
  • Product Weight: 113 lbs.
  • Shipping Weight: 200 lbs.
  • This product ships via common carrier truck line from Tonawanda, New York
  • Limited Manufacturer's Warranty:
    • 5 Years on shell
    • 3 Years on all other parts
    • For complete details, please see our Warranty Information page

Return Policy:
Please note, there is a 20% restocking fee on all returns of this item. For complete details, please see our store Return Policy page.

NOTE: Free Ground shipping for contiguous United States (lower 48 states) only. Sorry, we do not ship outside the contiguous United States (lower 48 states).

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