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CENTREX 1000 Medium Capacity Electric Central System (Water Flush)
Centrex 1000 medium capacity composting toilet by Sun-Mar

Toilet fixtures sold SEPARATELY.

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Product Code: CENTREX_1000
Our Price: $2,175.00

Availability: Usually Ships in 1 to 2 Weeks


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How to Operate the CENTREX 1000
Product Features
Technical Specs
Return Policy
Customer Reviews For This Product

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. It is important to note that with all central systems, what you are purchasing is the central composting unit that is installed on the lower level; the toilet fixtures to be installed in the bathroom are sold separately.

The CENTREX 1000 system is designed for light to medium seasonal use, and is particularly useful in narrow spaces, since the unit only measures 22-1/2" wide. This electric, low flush central system is designed for homes with a constant supply of electricity and plumbing connections for water. The electrical features of the CENTREX 1000 include a thermostatically controlled heater, located in a sealed compartment in the base of the unit, and a fan assembly at the front left side. The heater helps to warm and evaporate liquid, while the fan assembly maintains a partial vacuum within the unit at all times, ensuring odorless operation.


CENTREX 1000 units have been tested and certified by the National Sanitation Foundation (NSF) and are listed to comply with NSF-ANSI Standard #41, the only North American performance standard for composting toilets. This means that CENTREX 1000 systems are certified to operate odorlessly and produce a clean, dry compost that is safe and sanitary. Visit the NSF website to see the CENTREX 1000's NSF Certification Listing.

How to operate the CENTREX 1000:
  • For initial start up, add some Compost Sure Blue (hemp stalk bulking material) into the Bio-Drum™ together with some Microbe Mix.
  • Use any toilet paper you want; the composting toilet will compost it without a problem.
  • For ongoing operation, add a cupful of Compost Sure Blue per person, per day of use. Every 2-3 days (while unit is in use), rotate the drum 5 or 6 full revolutions. For weekend use, just rotate before you leave at the end of the weekend.
  • When the Bio-Drum™ is half to 2/3 full, some of the compost should be moved to the finishing drawer. To do this, simply release the drum lock and rotate the drum backwards. Finished compost drops automatically into the finishing drawer. This process takes less than a minute, and most importantly, you never come into contact with fresh material.
  • When compost is moved to the finishing drawer, it should be left there for at least 4 weeks so it can finish and sanitize. In the finishing drawer, it will be isolated from contamination by fresh material in the toilet. Once 4 weeks have passed, you can remove the finished compost from the finishing drawer at any time. The drawer is easily pulled out by hand; no tools are needed to open it.
  • What do you do with the finished compost? Add it to your flower garden! 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 electric unit that uses water
  • Works with one pint low flush toilets, SOLD SEPARATELY
  • Features patented Bio-Drum™ for composting capacity of 5 adults or a family of 7 (This is for weekend use only. The CENTREX 1000 is not recommended for residential or continuous use)
  • NSF tested and certified for a continuous 6 months at maximum rated capacity (click here to view NSF certification)
  • All Sun-Mar units feature 3-chamber technology:
    • The patented Bio-Drum™, where compost is mixed and aerated
    • The Evaporating Chamber, where excess liquid is evaporated
    • The Finishing Drawer, where finished compost is kept separate from unfinished material
  • Electrical features include a thermostatically controlled heater in the base of the unit to warm and evaporate excess liquid and a fan assembly in the top left of the unit that maintains a partial vacuum to ensure odorless operation at all times

Technical Specs:
  • Designed for use with one pint low flush toilets, SOLD SEPARATELY
  • More than one toilet can be installed on the CENTREX 1000 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:
    • Weekend & Vacation Use: 5 Adults or a Family of 7
    • Please note, family numbers above include both adults and small children
    • Not recommended for residential or continuous use
  • Electrical:
    • Max Amps (with heater on): 2.5
    • Fan Watts: 35
    • Heater watts (when thermostat switches it on): 260
    • Average Power Use in Watts (heater on 1/2 time): 150
  • Vent & Drains:
    • Vent Pipe: 2" Cent. Vac. tubing
    • Drain: 1" O.D. (Note: drain hookup is required on this unit)
  • Dimensions:
    • Unit Dimensions: 22-1/2" W x 32-1/2" D x 28-1/2" H
    • Width required to turn handle: 24-1/2"
    • Shipping Carton Dimensions: 35" L x 28" W x 31-1/2" H
  • Rough-in Measurements:
    • Depth required to remove finishing drawer: 46-1/4"
    • Note: Waste inlet is the "collar" at the top of the unit that the toilet drain connects into
    • Height from base of unit to bottom of waste inlet assembly: 26-1/2"
    • Height from base of unit to top of waste inlet assembly: 29-3/4"
    • Height of waste inlet assembly: 3-1/4"
    • Diameter of waste inlet (including flange): 3" DWV
    • Vent inlet center distance from rear of unit: 17-1/8"
    • Height to center of vent outlet assembly: 26-1/2"
  • Unit shell is constructed of durable fiberglass
  • Product Weight: 50 lbs.
  • Shipping Weight: 95 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 1000, installed 1995
Location: Installed in cottage in Redwood, NY
Reviewed By: Barbara Kinner

When Barbara built her beautiful home on the Lake, she had to work out how to deal with the problem of building on solid rock. Luckily, a friend suggested what she describes as "the perfect answer", a Centrex. When Barbara's family visits there are as many as 12-15 people. She is "very satisfied with the unit cost wise and maintenance wise", and has recommended the unit to several people.
We are really pleased about that!

See More Reviews for this product.

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Microbe Mix, 17 oz. jar
Our Price: $29.99

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Compost Quick Cleaner for Sun-Mar Composting Toilets
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Model 510 Plus Low Flush Toilet by Sun-Mar
Compost Sure Blue, 8 gallon bag
Our Price: $54.99

Compost Sure Blue for Sun-Mar Composting Toilets

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