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

Toilet fixtures sold SEPARATELY.

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Product Code: CENTREX_3000_ACDC
Our Price: $2,724.00
$200 Rebate Available!

Availability: Usually Ships in 1 to 2 Weeks


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

The CENTREX 3000 AC/DC is a hybrid water flush 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 acts like a chimney on a wood stove, constantly drawing 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; however, a power source for this fan is not included. The CENTREX 3000 AC/DC works well in homes that have no electricity, frequently use generators or experience regular power outages.

These extra high capacity units are designed for very heavy cottage use or medium heavy residential use. CENTREX 3000 family units are unique from other central composting systems because they incorporate Sun-Mar's Auto-Flow technology. Finished compost moves automatically through the drum and into a separate collection chamber at the end of the unit, when the drum is rotated. The result is easy compost removal.

If you are wanting a traditional looking toilet in the bathroom, and have the ability to place the central composting unit below the toilet, this system will work well for your application. Remember that the unit you are purchasing does not include the toilet fixtures to be installed in the bathroom. These are sold separately.


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.

Easy operation of the CENTREX 3000 AC/DC:
  • Initially you will need to add some Compost Sure Blue (hemp stalk bulking material) to the Bio-Drum™ together with some Microbe Mix.
  • The composting toilet will compost any toilet paper you want to use, without a problem.
  • For ongoing operation, everyday you will need to add a cupful of Compost Sure Blue per person. Then every 2-3 days (while unit is in use), rotate the drum 5 or 6 full revolutions. When using the system less that 2-3 days, you can rotate the drum before you leave.
  • The unique Auto-Flow technology of the CENTREX 3000 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 before use, to become fully finished and sanitized.
  • 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. So add it to your flower garden!

Composting Toilet

  • This is a central system that requires water.
  • Please note, the Centrex 3000 AC/DC is comprised of the Centrex 3000 standard electric unit plus an AC/DC Conversion Kit. See Instruction Manuals below for more information.
  • Works with one pint low flush toilets, SOLD SEPARATELY.
  • Combination electric/non-electric unit that can operate with or without a continuous supply of 110 volt electricity.
  • 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).
  • Odorless operation is maintained via a heater which warms and evaporates excess liquid and a fan assembly that maintains a partial vacuum.
  • Without electricity, the 4" Vent stack maintains a partial vacuum, for oder free use.
  • Comes complete with a a 2.4 watt 12 volt fan that fits in the vent stack to improve venting (power source for the fan is not included).
  • All Centrex 3000 Family units feature 3-chamber technology that is unique from other Centrex central systems:
    • The patented Bio-Drum™, allowing the compost to mix and aerate.
    • The Evaporating Chamber, for evaporation of excess liquid.
    • The Collection Chamber, where finished material automatically flows and can be removed easily when needed.

Composting Toilet

Technical Specs:
  • Designed for use with one pint low flush toilets, SOLD SEPARATELY
  • More than one toilet can be installed on the CENTREX 3000 AC/DC system because the capacity limitation is based on the number of people using the system rather than the number of toilets
  • View Dimensional Line Drawing
  • View Centrex 3000 Instruction Manual
  • View AC/DC Conversion Kit Instruction Manual
  • Composting Capacity When Operating Electrically:
    • Residential & Continuous Use: 6 Adults or a Family of 8
    • Weekend & Vacation Use: 9 Adults or a Family of 11
    • 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: 8 Adults or a Family of 10
    • 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: 32-1/2" (Note: Waste inlet is the "collar" at the top of the unit that the toilet drain connects into)
    • Diameter of waste inlet (including flange): 3" DWV
    • 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: 107 lbs.
  • Shipping Weight: 194 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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