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COMPACT Self-Contained Medium Capacity Electric Unit
Compact self contained composting toilet by Sun-Mar

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Product Code: COMPACT
Our Price: $1,825.00

Availability: Usually Ships in 1 to 2 Weeks

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

The COMPACT is a medium capacity electric self-contained toilet and an ideal model for light residential or light to medium cottage use. It is especially popular for use in cabanas, guest houses, pool houses, or any remote place where there is an electrical connection but no plumbing. Because the COMPACT toilet uses no water, you won't have to worry about plumbing or hook ups for installation. All you have to do to install the unit is assemble the vent stack that comes included with the toilet.

The COMPACT is designed as a small, low profile unit. This allows the seat to be only slightly higher than a regular toilet, a feature that makes the COMPACT ideal for elderly or handicapped individuals.


There is only one performance standard in North America for composting toilets, and that is the National Sanitation Foundations NSF/ANSI Standard #41-1999. Only Sun-Mar composting toilets are certified by the NSF for residential and/or seasonal use. This means that all our composting toilets have been tested by an NSF recognized independent testing laboratory for 6 months at maximum capacity, and they are certified to operate without odor and produce a clean, safe compost. For verification, please see Sun-Mar's NSF Listing.

Operation of the COMPACT:
  • This toilet will compost any kind of toilet paper you like to use.
  • At the time of initial start up, you will need to add some Compost Sure into the Bio-Drum™ together with some Microbe Mix.
  • During continued use, add Compost Sure as specified in the product instruction manual. Rotate the drum 5 or 6 full revolutions, every 2-3 days.
  • For weekend use, just rotate before you leave at the end of the weekend.
  • You will need to move some of the compost to the finishing drawer, when the Bio-Drum™ is half to 2/3 full. This is accomplished by simply releasing the drum lock and rotating the drum backwards. Finished compost then drops automatically into the finishing drawer. This process is quick and clean, as you never come into contact with fresh material.
  • The compost should be left in the finishing drawer for at least 4 weeks so it can finish and sanitize. At this time, it is isolated from contamination by fresh material in the toilet. Once 4 weeks have passed, you can rthe finishing drawer at any time.
  • Add the finished compost to your flower garden! The finished product is clean, dry, non-offensive, and sanitary.

Composting Toilet

  • Self-contained waterless, electric unit
  • Features the patented Bio-Drum™ for composting capacity of 3 adults (weekend use) or 1 adult (residential and continuous use)
  • NSF tested and certified for a continuous 6 months at maximum rated capacity (click here to view NSF certification)
  • Electrical heater in the base of the unit warms and evaporates excess liquid. Odorless operation is maintainted by a fan assembly in the top rear of the unit that maintains a partial vacuum.
  • Available in your choice of Bone or White.
  • All Sun-Mar units feature 3-chamber technology:
    • The patented Bio-Drum™ - compost is mixed and aerated
    • The Evaporating Chamber - excess liquid is evaporated
    • The Finishing Drawer - finished compost is kept separate from unfinished material

Composting Toilet

Technical Specs:
  • View Dimensional Line Drawing
  • View Product Instruction Manual
  • Composting Capacity:
    • Residential & Continuous Use: 1 Adult
    • Weekend & Vacation Use: 3 Adults or a Family of 4
    • Please note, family numbers above include both adults and small children
  • Electrical:
    • Max Amps (with heater on): 2.0
    • Fan Watts: 35
    • Heater watts (when thermostat switches it on): 200
    • Average Power Use in Watts (heater on 1/2 time): 125
  • Vent & Drains:
    • Vent Pipe: 2" Cent. Vac. tubing
    • Drain: 3/4" O.D. (Note: drain hookup is optional, but is is recommended that you do hook up the drain in all installations.)
  • Dimensions:
    • Unit Dimensions: 21-1/2" W x 33" D x 28-1/2" H
    • Shipping Carton Dimensions: 35-1/2" L x 28" W x 30-1/2" H
  • Rough-in Measurements:
    • Depth required to remove finishing drawer: 45"
    • Vent outlet center distance from left side (looking at back of unit): 7-1/2"
    • Height to center of vent: 23-1/2"
  • Unit shell is constructed of durable fiberglass and high-impact polystyrene
  • Product Weight: 50 lbs.
  • Shipping Weight: 90 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: Compact, Installed 1999
Installed at cabin in Pocono, Lake Preserve, PA
Reviewed By:
Louise Perkins

We installed the Compact after struggling without success with another composting toilet for many years. The Compact is used daily for 4-6 weeks each summer and then for occasional weekend use the rest of the year. It works wonderfully!

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Accessories for this product...
Fan Speed Control (For Use With Electric Units)
Our Price: $84.99

composting toilet fan speed control for Sun-Mar composting toilets
Compost Sure, 8 gallon bag
Our Price: $49.99

Compost Sure for Sun-Mar Composting Toilets
Compost Quick Cleaning Spray, 16 oz. bottle
Sale Price: $22.00 CLOSE OUT PRICING

Compost Quick Cleaner for Sun-Mar Composting Toilets
Microbe Mix, 17 oz. jar
Our Price: $29.99

Microbe Mix for Sun-Mar composting toilets

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