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SPACESAVER Self-Contained Medium Capacity Electric Unit
Spacesaver self contained composting toilet by Sun-Mar

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Product Code: SPACESAVER
Our Price: $2,025.00

Availability: Usually Ships in 1 to 2 Weeks

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

The SPACESAVER is a medium capacity electric self-contained toilet that's designed for places where space is extremely limited. Its tiny profile of 19-1/2" wide by 23" deep means that it's only slightly larger than a standard toilet seat. Now even a closet or small corner nook can be turned into a bathroom! The SPACESAVER is also a waterless unit, meaning you won't have to worry about plumbing in water lines when you install it.

The SPACESAVER has a standard 2" vent stack that exits vertically, straight out the top of the unit.


The Composting Toilet Store sells only Sun-Mar brand composting toilets because they are the only composting toilets to be tested and certified by the NSF! What does this mean? The NSF, or National Sanitation Foundation, has established a standard for composting toilets in North America, the 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 SPACESAVER:
  • When initially setting up, add Compost Sure (peat bulking material) into the Bio-Drum™ along with Microbe Mix.
  • The composting toilet will process any type of toilet paper, so you can use your favorite.
  • For continual operation, add Compost Sure as specified in the product instruction manual. Then 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.
  • When the Bio-Drum™ is half to 2/3 full, release the drum lock and rotate the drum backwards, which allows finished compost to drop automatically into the finishing drawer. This process takes less than a minute, and most importantly, you never come into contact with fresh material.
  • The compost should be left there for at least 4 weeks so it can finish and sanitize. 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.
  • It will look and smell just like any other regular compost that might come out of a garden composter, clean, dry, non-offensive, and sanitary.

  • Self-contained waterless, electric unit
  • 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)
  • Includes a 160 watt thermostatically controlled heater in the base of the unit to warm and evaporate excess liquid (if any is present) and a 35 watt fan to evaporate liquid and maintain a partial vacuum to ensure odorless operation at all times
  • Available in your choice of Bone or White colors
  • 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

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): 1.2
    • Fan Watts: 35
    • Heater watts (when thermostat switches it on): 160
    • Average Power Use in Watts (heater on 1/2 time): 110
  • Vent & Drains:
    • Vent Pipe: 2" Cent. Vac. tubing
    • Drain: 1" O.D.
  • Dimensions:
    • Unit Dimensions: 19-1/2" W x 23" D x 30" H
    • Shipping Carton Dimensions: 29" L x 22" W x 37" H
    • Height of Footrest (when in use): 10-1/2"
    • Height (footrest to seat): 17"
  • Rough-in Measurements:
    • Depth required to remove finishing drawer: 38"
    • Vent outlet center distance from left side (looking at back of unit): 7"
  • Unit shell is constructed of durable fiberglass
  • Product Weight: 40 lbs.
  • Shipping Weight: 75 lbs.
  • This product ships via common carrier truck line
  • 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: Spacesaver, installed 2000
Location: Installed in cottage in Topeka, KS
Reviewed By: Weidner

Bill's SpaceSaver is installed at the Weidner cottage which is used nearly 365 days a year. He reports that "installation was a 'snap', I installed it myself in less than 2 hours."
He opted for a Sun-Mar because of the cost of a septic system and the fact that he didn't want to disturb the trees around his cottage. He also likes the idea of being able to use the compost for his plants. "I have nothing but praise for the Sun-Mar", enthuses Mr. Weidner..

See More Reviews for this product...

Accessories for this product...
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
Compost Sure, 8 gallon bag
Our Price: $49.99

Compost Sure for Sun-Mar Composting Toilets
Fan Speed Control (For Use With Electric Units)
Our Price: $84.99

composting toilet fan speed control for Sun-Mar composting toilets

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