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

Toilet fixtures sold SEPARATELY.

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Product Code: CENTREX_3000
Our Price: $2,599.00

Availability: Usually Ships in 1 to 2 Weeks


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How to Operate the CENTREX 3000
Product Features
Technical Specs
Return Policy
Customer Reviews For This Product

The CENTREX 3000 is an electric, water flush central system designed for homes with a constant supply of electricity and plumbing connections for water. This system features a thermostatically controlled heater in a sealed compartment beneath the unit that helps to warm and evaporate liquid. A 35 watt fan directing air up the 2" vent stack maintaining a partial vacuum within the unit, ensures odorless operation.

The CENTREX 3000 family are extra high capacity units 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. This means 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!

CENTREX Central systems are an ideal solution for those who want a traditional looking toilet in the bathroom, and who have the ability to place the central composting unit below the toilet. Please note that with all central systems, you are purchasing the central composting unit that is installed on the lower level; the toilet fixtures to be installed in the bathroom 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.

Instructions for operating the CENTREX 3000:
  • Initially, you will need to add some Compost Sure Blue (hemp stalk bulking material) into the Bio-Drum™ along with some Microbe Mix.
  • The toilet will compost any type of toilet paper you choose to use.
  • For continued operation, for each person using the unit, add a cupful of Compost Sure Blue, per day of use. Then, every 2-3 days (while unit is in use), rotate the drum 5 or 6 full revolutions. For shorter periods, just rotate before you leave.
  • The unique Auto-Flow technology of the CENTREX 3000 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.
  • You might ask, what do you do with the finished compost? Add it to your flower garden! The finished product is clean, dry, non-offensive, and sanitary.

Composting Toilet

  • This is a Central system that requires electricity and water for operation.
  • Works with one pint low flush toilets, SOLD SEPARATELY
  • Features extra large patented Bio-Drum™ for composting capacity of 9 adults (weekend use) or 6 adults (residential and continuous use)
  • NSF tested and certified for a continuous 6 months at maximum rated capacity (click here to view NSF certification)
  • Includes a thermostatically controlled heater to warm and evaporate excess liquid and a fan assembly that maintains a partial vacuum to ensure odorless operation at all times
  • 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 one pint low flush toilets, SOLD SEPARATELY
  • More than one toilet can be installed on the CENTREX 3000 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 Product Instruction Manual
  • Composting Capacity:
    • 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
  • 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
    • 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 33" 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
    • Vent inlet center distance from rear of unit: 24"
    • Vent inlet center distance from left side of unit: 37-3/4"
    • Height to center of vent outlet assembly: 24-3/4"
  • Unit shell is constructed of durable fiberglass
  • Product Weight: 102 lbs.
  • Shipping Weight: 172 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).

Model: Centrex 3000
Location: Installed at camp on Lake Garfield, MA
Reviewed By: Gary O'Brien

We have a small summer camp on a lake in western Mass. 2003 is our sixth year of composting with Centrex Plus. It handles 4-6 people on weekends and small gatherings of about 15 people very well. We produce an average of two 5 gallon pails of compost per season (May to Oct.). Its great, easy, inexpensive and an excellent system.

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