Best Composting Toilets for Vans in 2026
The best composting toilets for camper vans in 2026: Nature's Head, Trelino, OGO and Cuddy compared on size, liquids and solids capacity, venting and warranty.
Affiliate disclosure: product links on this page go to Amazon or to the maker's own store. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you; links to makers' own stores earn us nothing. No retailer or brand sees our picks before they are published or has any say in them. How we choose.
The Nature's Head is the pick for a full-time van: Nature's Head lists a 2.2 gallon liquids bottle, 60 to 80 uses in the solids bin (about a month for two people), a 12V fan drawing 0.07 amps and a 5-year warranty. For less money and a smaller footprint, the Trelino Evo L has 2.6 gallon urine and solids containers (per the Amazon listing).
All picks separate liquids from solids, which is what keeps a composting toilet dry and low in odor. Picks were chosen on maker and listing figures for capacity, footprint, venting and warranty.
Our top picks at a glance
1. Best overall
Nature's Head Composting Toilet (close-quarters handle)Liquids: 2.2 gal · Solids: 60 to 80 uses · Size: 21 x 19 x 19 in · Fan: 12V, 0.07 A
2. Best portable
Trelino Evo LLiquids: 2.6 gal · Solids: 2.6 gal · Size: 13 x 15.4 x 16.9 in · Fan: Not stated
3. Best compact
OGO OriginLiquids: Diverted · Solids: 25 to 30 uses · Size: 15 in footprint · Fan: 12V
4. Best small
Trelino Evo SLiquids: 1.2 gal · Solids: 1.6 gal · Size: 13 x 15.4 x 11.7 in · Fan: Not stated
5. Best with a full indicator
Cuddy Lite Compost ToiletLiquids: Diverted · Solids: Not stated · Size: Not stated · Fan: Not stated
| Pick | Liquids | Solids | Size | Fan | Buy |
|---|---|---|---|---|---|
| Nature's Head Composting Toilet (close-quarters handle)Best overall | 2.2 gal | 60 to 80 uses | 21 x 19 x 19 in | 12V, 0.07 A | Amazon |
| Trelino Evo LBest portable | 2.6 gal | 2.6 gal | 13 x 15.4 x 16.9 in | Not stated | Amazon |
| OGO OriginBest compact | Diverted | 25 to 30 uses | 15 in footprint | 12V | Amazon |
| Trelino Evo SBest small | 1.2 gal | 1.6 gal | 13 x 15.4 x 11.7 in | Not stated | Amazon |
| Cuddy Lite Compost ToiletBest with a full indicator | Diverted | Not stated | Not stated | Not stated | Amazon |
Best overall
Nature's Head Composting Toilet (close-quarters handle)
For full-time use by one or two people.
- Liquids
- 2.2 gal
- Solids
- 60 to 80 uses
- Size
- 21 x 19 x 19 in
- Fan
- 12V, 0.07 A
Pros
- About a month of solids for two (Nature's Head)
- 5-year warranty
- Vent hose included
Cons
- Needs 2 in behind it to remove the bowl
Nature's Head lists 21 inches high, 19 wide and 19 deep for the spider-handle model, 23 lb empty, and 5 feet of 1.5 inch vent hose in the box. The foot-spider version is 20 inches wide, and the Structure Kit adds a 110V AC adapter and coco coir (per the Amazon listing).
Best portable
Trelino Evo L
For a van without a fixed vent.
- Liquids
- 2.6 gal
- Solids
- 2.6 gal
- Size
- 13 x 15.4 x 16.9 in
- Fan
- Not stated
Pros
- Two 2.6 gal containers (per the Amazon listing)
- Supports 330 lb (per the Amazon listing)
Cons
- No vent fan stated
Trelino lists two 2.6 gallon containers, 13 x 15.4 x 16.9 inches and a 2-year warranty (per the Amazon listing). The Evo S is the smaller sibling.
Best compact
OGO Origin
For a narrow bathroom.
- Liquids
- Diverted
- Solids
- 25 to 30 uses
- Size
- 15 in footprint
- Fan
- 12V
Pros
- 15 in footprint (per the Amazon listing)
Cons
- Smaller solids bin than Nature's Head
OGO lists a 15 inch footprint and a rear bin that holds solids for 25 to 30 uses (per the Amazon listing). The OGO Nomad is OGO's portable urine-diverting model.
Best small
Trelino Evo S
For weekend trips.
- Liquids
- 1.2 gal
- Solids
- 1.6 gal
- Size
- 13 x 15.4 x 11.7 in
- Fan
- Not stated
Pros
- Low height (per the Amazon listing)
- 2-year warranty (per the Amazon listing)
Cons
- Empties often with full-time use
The Evo S lists a 1.2 gallon urine container and a 1.6 gallon solids container (per the Amazon listing).
Best with a full indicator
Cuddy Lite Compost Toilet
For knowing when to empty.
- Liquids
- Diverted
- Solids
- Not stated
- Size
- Not stated
- Fan
- Not stated
Pros
- LED full indicator (per the Amazon listing)
- Liquid-diverting (per the Amazon listing)
Cons
- Fewer published specs
The Cuddy Lite lists a liquid-diverting design and an LED full indicator (per the Amazon listing).
How we chose
We compared liquids and solids capacity, footprint, venting and warranty from Nature's Head's page and the listings.
How they work
The EPA describes a composting toilet as a well-ventilated container where excrement breaks down under unsaturated but moist, aerobic conditions, helped by a carbon additive. It also notes that maintenance is the owner's job and that the end product must be handled under state and local rules.
What to look for
Capacity
Nature's Head rates its solids bin at 60 to 80 uses, about a month for two; smaller units fill sooner.
Venting
A small fan keeps the solids dry and odors outside. Nature's Head's 12V fan is listed at 0.07 amps.
Bulking material
Most use coco coir: see best coco coir for composting toilets.
What to skip
Skip any toilet that does not separate liquids, and check your campground or local rules for emptying. Compare with a cassette toilet in composting vs cassette toilets.
Frequently asked questions
What is the best composting toilet for a van?
For full-time use, the Nature's Head: 2.2 gallon liquids bottle, 60 to 80 solids uses and a 5-year warranty per the maker. Trelino and OGO are smaller.
How often do you empty a composting toilet?
Nature's Head says its solids bin lasts about a month for two users; its 2.2 gallon liquids bottle needs emptying more often than that.
Do composting toilets smell?
They are designed not to when liquids are separated and the solids are vented and kept dry with a carbon material like coco coir.
Do composting toilets need power?
Many have a small 12V fan. Nature's Head lists 0.07 amps; some portable models have no fan.
Where do you empty a composting toilet?
The EPA says the end product must be handled under state and local regulations. Check the rules where you are before emptying.
Sources
- Nature's Head Composting Toilet, Nature's Head
- Water Efficiency Technology Fact Sheet: Composting Toilets (EPA 832-F-99-066), U.S. Environmental Protection Agency
Related guides
Best Coco Coir for Composting Toilets in 2026
The carbon cover that keeps a composting toilet dry.
Best Portable Cassette Toilets for Vans in 2026
Flushing portable toilets with a detachable waste tank.
