A self-contained composting toilet keeps waste in a drum or chamber under the seat, where it mixes with bulking material and breaks down into compost. A heater evaporates liquid and a fan vents moisture outside, so most need 120 V power. They’re bigger than urine-diverting toilets and cost more, but they’re rated for full-time households and only need emptying every few months.
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Full ranking 6
- Sun-Mar Excel NE#1 of 6Full review
For off-grid cabins that need a certified toilet with no power; plan for a drain line and a tall vent.
Sun-Mar $1,825$1,8252 peopleNone neededYes - Sun-Mar Excel#2 of 6Full review
For cabins and homes on grid power that need a certified toilet for a full time household; its power draw rules out vans and small solar systems.
Sun-Mar $2,040$2,0403 people120VYes - BioLet 55#3 of 6Full review
For grid-powered cabins and cottages that want a hands-off composting toilet: automatic mixing and evaporation with no urine bottle, at a high price.
BioLet $2,255$2,255-120V- - Sun-Mar Spacesaver#4 of 6Full review
For a small cabin bathroom on grid power with one full time user or occasional guests, where a certified toilet is required.
Sun-Mar $1,935$1,9351 people120VYes - BioLet 65#5 of 6Full review
For full-time households on grid power that want a hands-off composting toilet with no urine bottle; the price and power needs rule it out for vans.
BioLet $2,970$2,9704 people120V- - Sun-Mar Compact#6 of 6Full review
For a single full time user or a weekend cabin on grid power that needs a certified toilet with a lower profile than the Excel.
Sun-Mar $1,975$1,9751 people120VYes
