Sun-Mar Mobile 120V Composting Toilet


  • Sun-Mar Mobile self-contained composting toilet
  • Fully sealed & gasketed, for no-leak operation in Marine/RV installations.
  • 3 adults/Family of 4: Weekend/vacation use
  • 1 adult/Family of 2: Full-time use
  • Electricity required (12V fan, 110V heater)
  • Flat $250 Shipping in US 48 contiguous states.


Sun-Mar’s Mobile composting toilet allows you to enjoy the convenience of a composting toilet in your RV or boat! With a few modifications to their composting system, Sun-Mar developed a spill-proof, compact unit especially designed for the demands of mobile installation.

For occasional use, the Mobile can be used by 3 adults or a family of 4. If you live on your boat or in your RV full time, SunMar recommends a regular use limit of 1 adults or a family of 2. From the manufacturer:

Recycling Brings Freedom. The original composting toilet for Mobile and Marine applications, no muss and no fuss, no changing containers, no pouring out urine. Self-contained and with a little maintenance works like a charm! The Sun-Mar Mobile was the first composting toilet specifically designed to recycle waste on boats and recreational vehicles. Less pump-outs! No more chemical toilets! Recycling brings freedom, with the ODOR-FREE operation of a Sun-Mar.

Electrically, the Sun-Mar Mobile units are quite different from other units because of the unique situation on many boats and RV’s. A 4.0 Watt 12 Volt fan is installed in a fan box within the vent stack. This fan, (which is on its own circuit) is designed to operate continuously while the unit is in use. To assist the 12 Volt fan in providing adequate venting, the Sun-Mar Mobile is unique among Sun-Mar units in having a 3″ vent stack. Customers need to supply their own deck vents, which should be constructed to allow adequate air movement while preventing seawater from entering the unit.

Evaporation is aided by a 110 volt, 120 Watt heater and thermostat. This heater is located in the sealed base compartment.
The thinking in designing a 110 volt heater into the unit was that a 12 Volt supply is often available while the unit is in motion, while the 110 volt heater can frequently be used while the vehicle is in an RV park, or, in the case of a vessel, hooked up to shore supply.There should be enough 12 Volt battery power to keep the 12 Volt 4.0 Watt fan running continuously, and it hooks up on a separate circuit to facilitate this.

Overflow Drain Required
Evaporation capacity on Sun-Mar Mobile units is limited by the size of the heater, the surface area of the evaporation chamber, and the volume of air movement. Consequently, arrangements should be made to connect the Sun-Mar Mobile drains to a container or small holding tank for disposal in an approved manner.

Additional information

Weight90 lbs




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