BioLet 55
#3 in CompostingFull 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
2.8/5
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.
- 1 peopleCapacity
- 120VPower
- YesNSF/ANSI 41
- 3 yearsWarranty
Check price at Sun-Mar$1,975
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- NSF/ANSI 41 certified for permits
- The lowest seat of Sun-Mar’s electric models, at 28 1/2 in overall height
- Composts in a drum, with no urine bottle to empty
Cons
- Rated for only one adult full time, yet costs more than many diverting toilets that serve two
- Needs a 120 V outlet and averages about 125 W
- Three year parts warranty
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Capacity | |
|---|---|
| Type | Composting drum or chamber |
| Full-time residents | 1 people |
| Urine drain option | No |
| Agitator | Yes |
| Power and venting | |
| Power | 120V |
| Fan | 35 W |
| Heater | 200 W |
| Vent size | 2 in |
| Build | |
| NSF/ANSI 41 | Yes |
| Dimensions | 21.5 x 33 x 28.5 in |
| Weight | 48 lb |
| Warranty | 3 years |
Alternatives in this type
Sun-Mar Spacesaver
#4 in CompostingFull 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$1,935
BioLet 65
#5 in CompostingFull 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$2,970
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