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EXCEL Self-Contained High Capacity Electric Unit
Excel self contained high capacity electric composting toilet by Sun-Mar

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Product Code: EXCEL
Our Price: $2,025.00

Availability: Usually Ships in 1 to 2 Weeks

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Sun-Mar Excel

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How to Operate the Sun-Mar EXCEL
Product Features
Technical Specs
Return Policy
Customer Reviews For This Product

The Sun-Mar EXCEL is the highest capacity self-contained toilet and the preferred self-contained model for heavy cottage or continuous residential use. The EXCEL is an electric unit, specifically designed for those with a constant source of electricity. Features include an electric thermostatic heater in the base of the unit to warm and evaporate excess liquid. It also has a fan assembly in the top rear of the unit which maintains a partial vacuum to ensure odorless operation. Sun-Mar EXCEL units are easy to install because they are waterless, and thus require no plumbing or hook-up. The only thing you'll have to do is assemble the vent stack that comes with the unit.


Sun-Mar's EXCEL is the world's only self-contained unit that is NSF certified to evaporate all liquids while operating odorlessly and producing a clean, dry compost. When you purchase an EXCEL, you are literally purchasing the unit that sets the standard for self-contained composting toilets!

Guidelines for use of the EXCEL:
  • At the time of initial set-up and use, you will need to put some Compost Sure (peat bulking material) into the Bio-Drum™ along with some Microbe Mix.
  • You may use your favoriate toilet paper, it will process problem free.
  • During daily use, add Compost Sure as specified in the product instruction manual. Every 2-3 days, rotate the drum 5 or 6 full revolutions.
  • For periods of shorter use, rotate the drum before you leave.
  • When the Bio-Drum™ is half to 2/3 full, some of the compost should be moved to the finishing drawer by releasing the drum lock and rotating the drum backwards. This causes compost to drop into the finishing drawer. This process takes less than a minute, and most importantly, you never come into contact with fresh material.
  • Leave the compost in the drawer for at least 4 weeks so it can finish and sanitize. It will be safe from contamination because it is kept separate from fresh material in the toilet. Once 4 weeks have passed, you can easily remove the finished compost from the finishing drawer.
  • The finished product will look and smell just like any other regular compost that might come out of a garden composter.

Composting Toilet

  • Self-contained electric unit that is also waterless
  • Features large, patented Bio-Drum™ for composting capacity of 6 adults (weekend use) or 3 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 liquid along with a fan in the top rear of the unit to maintain a partial vacuum to ensure odorless operation
  • 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: 3 Adults or a Family of 5
    • Weekend & Vacation Use: 6 Adults or a Family of 8
    • Please note, family numbers above include both adults and small children
  • Electrical:
    • Max Amps (with heater on): 2.4
    • 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 optional, but is is recommended that you do hook up the drain in all installations.)
  • Dimensions:
    • Unit Dimensions: 22-1/2" W x 33" D x 33-1/4" H
    • Shipping Carton Dimensions: 35-1/2" L x 28" W x 36" H
    • Height of Footrest (when in use): 10-1/2"
    • Height (footrest to seat): 18"
  • Rough-in Measurements:
    • Depth required to remove finishing drawer: 46"
    • Vent outlet center distance from left side (looking at back of unit): 8-1/2"
    • Height to center of vent: 28-3/8"
    • Depth with footrest: 41-1/4"
  • Unit shell is constructed of durable fiberglass and ABS plastic
  • Product Weight: 60 lbs.
  • Shipping Weight: 100 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: Excel, Installed 1999
Location: Installed in cabin near Crystal Lake, Laramie County, Wyoming
Reviewed By: Barbara Curran

We installed the Excel unit in November of 1999. Since the cabin is without plumbing, the Excel was and is ideal. It looks good and everyone can use it without a problem. It has serviced a large group (12) on a given day and is odorless. We are so glad we found this system, otherwise we would not have purchased our "get-a-way".

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

Microbe Mix 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

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