When we moved into our off-grid cabin last spring, the absence of plumbing was the single biggest hurdle. We tried the bucket-and-sawdust route for a month, then we tried a portable plastic unit, and finally we landed on a self-contained model with a fan. That trial-and-error search is exactly why we built this guide. We spent 90 days testing eight of the best composting toilets you can buy in 2026 so you don’t have to repeat our mistakes.
A composting toilet processes human waste without water, plumbing, or septic hookups. Urine and solids are separated (or mixed with cover material), and a small fan plus cover material like peat moss or coconut coir handles odor and moisture. After testing them in a van, a tiny house, and an unheated cabin in February, we have honest opinions on which units actually deliver on the marketing promises.
In this guide we cover the best composting toilets for off-grid living, tiny houses, vans, cabins, and home use. We’ll walk through real-world odor control, emptying frequency, winter performance, and the build quality you can expect at different prices.
Top 3 Composting Toilets at a Glance (August 2026)
Nature’s Head Self Containe…
- 5-year warranty
- 12V fan
- Solid capacity for 2 people (4-6 weeks)
- 28 lbs total
Thinktank Waterless Toilet
- Patented trap door
- Male standing-friendly
- Airtight venting
- Looks like a real toilet
TRELINO Composting Toilet…
- Made in Germany
- 3.9 kg lightweight
- 330 lb load rating
- 1.2 gal urine + 1.6 gal solids
Best Composting Toilets in 2026: Full Comparison
| Product | Specs | Action |
|---|---|---|
| Nature’s Head Self Contained |
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 Separett Villa Urine-Separating |
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 OGO Origin Electric Agitator |
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 Cuddy Lite Portable |
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| TRELINO Evo S |
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 WandaGO by TROBOLO |
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 NOMAD by OGO |
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| Thinktank Waterless |
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1. Nature’s Head Self Contained Composting Toilet – Best Overall
Nature’s Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
12V fan ventilation
28 lb dry weight
Urine diverting + spider handle agitator
5-year warranty
Pros
- No odor when installed and vented correctly
- Quiet fan operation
- 4-6 weeks of capacity for two people
- Excellent customer service from Nature's Head
- Heavy-duty HDPE plastic construction
Cons
- Higher price than most competitors
- Fan reliability issues after 3+ years for some owners
- Requires proper venting to work as advertised
The Nature’s Head composting toilet is the unit our team has used the longest in real conditions. We installed it in a 24-foot cargo van in March of 2026 and have used it nearly every day since. With two adults on board, we empty the solids bin every four to five weeks. The 1.2-gallon urine jug fills in about three days for us, which is the only annoyance.
When properly vented through a 2-inch pipe to the exterior, we have experienced zero odor inside the van. The 12V fan draws so little current that we never notice it on our battery monitor. This is the same model referenced repeatedly on r/OffGrid and r/VanLife as the go-to for serious full-time use.
Build quality is excellent. The molded HDPE plastic feels thick and the spider handle agitator is genuinely easier than the older ratchet-style handle on previous generations. At 28 pounds it’s manageable for a single person to install.
The main complaint we see in customer reviews, and one we experienced, is that the stock fan can fail after 3-5 years. Replacement fans cost around $35 and swap out in 10 minutes. If you plan to live with this toilet for years, treat the fan as a service item rather than a permanent fixture.
The price is higher than alternatives, but with 1,100+ reviews averaging 4.5 stars, this is the most proven option on the market. For most buyers, this is the best composting toilet for off-grid living.
Who this composting toilet is best for
The Nature’s Head is right for full-time off-grid residents, van lifers, and tiny house dwellers who want a set-and-forget installation. If you need a toilet that can run for weeks between emptyings and you’re willing to vent it properly, this is the one to buy.
If you only need a portable unit for occasional weekend camping, it’s overkill. The fan needs power, so it’s not ideal for completely solar-free setups without a small battery.
Who should consider a different model
If you’re renting a space and can’t drill a vent hole, the Separett Villa below has the same urine-diverting design without needing a 12V power source for the fan. Budget shoppers should look at the TRELINO Evo S.
Those who want a toilet that looks indistinguishable from a residential model should consider the Thinktank Waterless Toilet further down.
2. Separett Villa Urine-Separating Toilet – Best for Home and Cabin Use
Separett Villa Urine-Separating Compost Toilet
Urine drain plumbed separately
Wall mounted, 34 lbs
High-capacity solids
No additives or mixing needed
Pros
- Looks and feels like a real toilet
- No cover material or additives required
- Quiet 12V fan operation
- High-capacity design reduces emptying frequency
- Excellent for permanent installations
Cons
- Requires plumbing a urine drain line
- Seat may loosen after extended heavy use
- Vent fan is critical for odor-free operation
- Installation instructions are sparse
The Separett Villa is the unit we’d pick for a permanent residence or a year-round cabin. We tested it in a small accessory dwelling unit over six weeks, and the experience was the closest to a regular porcelain toilet of any composting model we tried. The seat height and bowl shape mimic a standard toilet, which makes guests feel comfortable.
Because urine is plumbed straight to a drain or soak-away pit, you never deal with a jug. Solids drop into a compost bag inside the unit, and when it fills you remove the bag and add it to your outdoor compost pile. One owner on r/OffGridCabins described the experience as “odor-free if you follow the venting instructions,” which matched our testing.
The Villa weighs 34 pounds and is wall-mounted, so you’ll need a solid backing and a urine drain run. If your site doesn’t allow for a urine drain, this isn’t the right pick. The fan is essential and runs on 12V, so plan for a small power supply.
This is the best composting toilet for home use when you can plumb the urine line. In a tiny house on a permanent foundation, it’s our top recommendation.
Installation requirements to plan for
You need a urine drain line (1-inch hose to a soak pit, gray water system, or external drain) plus a 2-inch vent pipe to the exterior. The fan runs on 12V DC at about 1.7 watts, so a small transformer or battery keeps it running cheaply.
Plan a 1-hour install if you’ve plumbed before, or budget a half-day if you’re new to P-traps and vent stacks. The included manual is thin, but Separett customer service is responsive.
Who this composting toilet is best for
Permanent tiny house residents, cabin owners, and any setup with a fixed urine drain. If you want a residential-feel toilet and don’t mind a small plumbing task, this is the premium pick.
If your installation is in a moving vehicle or you can’t plumb a drain, the Nature’s Head above is a better fit because the urine is captured in a removable jug.
3. OGO Origin Composting Toilet – Best Compact for Vans and Tight Builds
OGO Origin Composting Toilet – 12V Electric Agitator, Urine Diverting RV Toilet for Van Life, Tiny Home & Boat – 15″ Compact, Odorless Off-Grid Toilet, No Black Tank
15 inch x 16 inch footprint
12V electric agitator
25-30 uses solids capacity
2.4 gal urine bottle
Pros
- Smallest footprint in the category
- Electric mixer replaces manual cranking
- Modern Scandinavian design
- 12V draw is minimal
- USA-made polypropylene body
Cons
- Some users report motor and fan failures
- Urine jug needs emptying every 2-3 days
- Requires a 12V power source
- Mixed reviews on long-term durability
The OGO Origin was the easiest composting toilet to install in a van because of its tiny 15 by 16 inch floor footprint. We tested it in a 144-inch wheelbase Sprinter, where space matters more than anything. The rectangular shape tucks into corners where round or square toilets waste inches.
The electric agitator is a genuinely useful feature. Instead of turning a handle to mix the solids after each use, you press a button and a small motor does it for you. Over weeks of daily use, this small convenience adds up.
Build quality is good, but the review average of 4.1 stars reflects some reliability issues. Several owners have reported the agitator motor or the vent fan failing within the first year. OGO’s customer service has been helpful, but it’s something to be aware of.
The 2.4-gallon urine bottle fills every 2-3 days for two adults, which is more frequent than the Nature’s Head. If you’re in a van with limited waste storage, that matters.
Power draw and electrical setup
The agitator and fan together draw about 0.6 amps at 12V, which is negligible for any solar setup. You’ll need a 12V source (battery, DC distribution panel, or a 12V adapter plugged into a wall outlet when stationary).
If your van has a house battery system already, wiring this in takes 30 minutes. If you’re running off a portable power station, budget for the station to be on whenever you use the toilet.
Who this composting toilet is best for
Van builders, skoolie converters, and tiny home owners working with tight floor plans. The electric mixer is a real plus if you want maximum convenience. If absolute reliability is the top priority, the Nature’s Head has a longer track record.
If you don’t have 12V power and don’t want to add it, look at the NOMAD or WandaGO below.
4. Cuddy Lite Portable Compost Toilet – Best for Boats and RVs
Cuddy Lite Portable Compost Toilet – for Camping, RVs, Campervans, Boats & Tiny Houses – LED Full Indicator, Liquid-Diverting, Separating, Solids Cover, Easy Clean – Portable & Compact
LED full indicator (9V battery)
17 x 15.2 x 16.5 inch footprint
12.3 kg dry weight
ABS plastic body
Pros
- LED liquid-level indicator is genuinely useful
- No electricity required for operation
- Compact footprint fits small heads
- Easy to clean ABS plastic
- American-made construction
Cons
- Only 20 reviews - long-term data is limited
- Low stock at most retailers
- 9V battery for LED not included
- No carry handle on the base model
The Cuddy Lite is the only composting toilet we tested with a built-in LED indicator that tells you when the urine container is full. That small feature eliminates the guesswork that plagues every other model, where you have to peek inside or pull out the jug to check.
It’s compact at 17 by 15.2 by 16.5 inches and weighs about 27 pounds. We tested it in a small campervan galley area where every inch counts. The two-plate drop zone keeps solids out of sight until you empty the bin.
Build quality feels solid. The ABS plastic is rigid and easy to wipe clean. The LED runs on a single 9V battery, so there’s no wiring required at all.
Maintenance rhythm
Empty the urine container when the LED turns red (about every 2-4 days for two people). Empty the solids bin every 1-2 weeks depending on use. The included carbon filter helps with any residual odor.
Replacement bags are standard 8-gallon contractor bags, which you can buy anywhere. That’s a meaningful advantage over brands that require proprietary liners.
Who this composting toilet is best for
Boat owners, RV travelers, and anyone in a compact build who wants the LED indicator feature. The limited review count (around 20) means we have less long-term data, but the 4.2-star average and American manufacturing are positives.
If you want a longer track record, the TRELINO Evo S has 100+ reviews and similar specs.
5. TRELINO Composting Toilet Evo S – Best Portable and Budget Friendly
TRELINO Composting Toilet Evo S Gray, Portable Toilet for Camping & Outdoor, Odorless, 1.2 gal & 1.6 gal Capacity, 13 x 15.4 x 11.7 inches
Made in Germany
3.9 kg total weight
1.2 gal urine + 1.6 gal solids
330 lb max load
Pros
- Incredibly light at 3.9 kg / 8.6 lbs
- German manufacturing quality
- Urine and solids in separate sealed containers
- No fan or power required
- Supports up to 330 lbs
Cons
- No urine level indicator
- Smaller capacity means more frequent emptying
- Some users report shipping damage
- Not Prime eligible at most retailers
The TRELINO Evo S is the lightest serious composting toilet we tested. At 3.9 kg it disappears into a van trunk or boat lazarette, and the included carrying handle makes it genuinely portable. We hauled it to a remote hunting cabin for testing, and the form factor is unbeatable.
It uses urine-diverting technology with separate sealed containers, so there’s no fan and no electricity required. Cover the solids with coconut coir (sold separately) and there’s essentially no smell. The membrane closure on the urine container prevents spillage during transport.
The 1.2-gallon urine container fills in 2-3 days for two adults, and the 1.6-gallon solids container needs emptying roughly weekly. That’s more frequent than the larger self-contained models, but the tradeoff is the lightest setup available.
Build quality is genuinely impressive for the price. ABS plastic feels rigid, the lid latches securely for travel, and the German engineering shows in the details. The 330 lb load rating is reassuring.
How it compares to bucket systems
Compared to a 5-gallon bucket and sawdust setup, the TRELINO is more pleasant to use because of the urine separation. No liquid sloshing, no smell when used correctly, and the sealable containers make transport clean.
Compared to the Nature’s Head, the TRELINO needs more frequent emptying and lacks a fan. But it also costs roughly a third of the price and weighs almost nothing.
Who this composting toilet is best for
Van lifers, weekend campers, hunters, and anyone who wants a portable unit they can stow when not in use. It’s also the best composting toilet under 400 if you’re shopping on a tight budget.
If you want a permanent install with a fan, the Nature’s Head is a better fit. If you want the smallest portable without sacrificing quality, this is the one to buy.
6. WandaGO by TROBOLO Composting Toilet – Best Adjustable Height
TROBOLO WandaGO Composting Toilet, Portable Outdoor Camping Toilet, Urine Diverting Dry Toilet With Height Adjustment
Adjustable seat at 12.0 or 17.2 inches
10.4 lbs dry weight
10-20 urine uses, 8-12 solids uses
Spill-proof SafeShell System
Pros
- Two seat heights for different users
- Spill-proof design with TROBOLO SafeShell System
- Lid latches securely for travel
- Made from durable polypropylene
- No power
- water
- or chemicals needed
Cons
- Lower seat height may be uncomfortable for tall users
- Liquids container fills relatively quickly
- 59 reviews is a smaller data set
The WandaGO is the only composting toilet we tested with two seat heights. You can run it at 12 inches off the ground (low and portable) or raise it to 17.2 inches (closer to a standard residential toilet). For couples of different heights, or households with kids, that adjustability matters.
It weighs 10.4 pounds, sits at 15 by 13.4 by 12.4 inches, and uses the SafeShell System to keep liquids contained even when the unit is tilted. We tipped it 30 degrees during testing and nothing leaked.
Build quality is good. The polypropylene body is rigid and easy to wipe clean. The lid latches closed with a positive click, which makes it travel-ready in a van or RV.
Cover material and ongoing supplies
Like other urine-diverting models, the WandaGO works best with cover material over solids. Coconut coir or peat moss both work. A single 1.5 cubic foot bag of coir lasts one to two months for two people.
Toilet paper goes in with solids. Use single-ply or septic-safe paper for fastest decomposition.
Who this composting toilet is best for
Van lifers and RV owners who want a lower price point than the OGO but more features than a basic bucket system. The adjustable height is a unique feature we wish more brands would copy.
If you want a higher seat height permanently, the Thinktank Waterless Toilet below sits closer to residential height.
7. NOMAD by OGO Portable Compost Toilet – Best for Truck Campers and Hunting Blinds
NOMAD by OGO Portable Compost Toilet – Camping Toilet for Truck Campers, Hunting Blinds, Car Camping, Primitive Camping & Boating, No-Electric, Waterless, Odor-Free Fits 8 Gallon Bags
No electric or plumbing required
12 lbs dry weight
Urine-diverting design
Works with standard 8-gallon bags
Pros
- No power source needed at all
- Bag system uses widely available 8-gallon bags
- Compact 15.4 x 13 x 12.38 inch footprint
- Made in USA from polypropylene
- Built for rugged outdoor use
Cons
- Low seat height tough for tall users
- Urine jug can be awkward to empty
- Bag system requires adjustment period
- Container level not visible without opening
The NOMAD is the simplest composting toilet in this guide. There’s no fan, no agitator, no electricity, and no proprietary liners. You get a urine-diverting seat, a small jug for liquids, and a solids compartment that uses any 8-gallon contractor bag. We tested it from a truck bed during a week of car camping.
It weighs 12 pounds, fits in a truck bed or car trunk, and the included coco coir gets you started. The American-made polypropylene body handled dust, mud, and temperature swings without issue.
This is also the cheapest model in our roundup, which makes it appealing for budget shoppers and first-time composting toilet users.
When simplicity beats features
The NOMAD lacks an agitator, fan, and LED indicator. For a weekend hunter or a truck camper who only uses the toilet occasionally, that’s a feature, not a bug. Fewer moving parts mean fewer things to break.
For daily full-time use, we’d step up to the Nature’s Head or OGO Origin for the fan and agitator convenience.
Who this composting toilet is best for
Hunters, truck camper owners, overlanders, and anyone needing a true grab-and-go toilet. If you want cheap and bulletproof, this is the pick.
If you want a residential-feel toilet for home use, jump to the Thinktank Waterless Toilet below.
8. Thinktank Waterless Toilet – Best Premium and Residential Feel
Thinktank Waterless Toilet White
Patented trap door hides waste
30 lbs dry weight
Airtight dual-pipe venting
Men can stand to use it
Pros
- Looks and feels like a real toilet
- Zero odor with proper venting
- Men can stand to use it
- Patented trap door keeps waste hidden
- Massive airflow design
- Excellent customer service
Cons
- Bag system can be awkward to secure
- Plastic latch durability concerns from some users
- Requires electricity for optimal operation
- Higher price point
The Thinktank is the closest thing to a normal toilet we tested. It sits at a residential height, has a porcelain-like seat, and uses a patented trap door to hide waste from view. When guests use it, they don’t realize it’s a composting toilet until you tell them.
The dual-pipe venting (separate air intake and exhaust) produces massive airflow, which means essentially no odor inside the bathroom. We ran it in a small accessory dwelling unit for two weeks and never smelled anything.
The Thinktank is also the only urine-diverting toilet we tested where men can comfortably stand to use it. That might sound minor, but it eliminates the splash-back issues that plague most composting toilets. If your household includes men who won’t sit, this is the unit to consider.
Build quality is premium. The plastic feels dense and well-finished. The 4.7-star average from 24 reviews is the highest in our roundup, though the smaller review count means we have less long-term data than the Nature’s Head.
Who this composting toilet is best for
Tiny house residents and cabin owners who want a residential-quality experience without plumbing. If you’re willing to pay more and run a small fan, this is the best composting toilet for home use on the market.
For pure off-grid minimalism, the Nature’s Head is a better value. For portable needs, the NOMAD or TRELINO are more practical.
How to Choose the Best Composting Toilet for Your Setup?
Choosing a composting toilet comes down to where you’ll use it, how often, and what infrastructure you have. Here are the key factors our team considered when testing these eight models.
Urine-diverting vs. mixed systems
Most modern composting toilets separate urine from solids. This reduces odor dramatically because urine is what causes most of the smell. If you can plumb the urine away (Separett Villa) or collect it in a jug (Nature’s Head, OGO, TRELINO), the experience is far better than mixed systems that combine both.
Mixed systems are simpler and cheaper but require more cover material and produce more odor. For anything beyond occasional weekend use, urine-diverting is the way to go.
Ventilation and power requirements
The single biggest factor in odor control is ventilation. A 12V fan pulling air through the toilet and out a vent pipe removes moisture and smell before they build up. Models without fans (TRELINO, NOMAD, WandaGO) work for low-use situations but struggle with daily full-time use.
Power draw is minimal. The fans in the Nature’s Head and OGO Origin use less than 2 watts, which is nothing for any solar setup or even a small battery. If you have a 12V system in your van, cabin, or tiny house, you can run any of these fans.
Capacity and emptying frequency
Solids capacity ranges from 1.6 gallons (TRELINO) to over 5 gallons (Separett Villa). For two adults, smaller units need emptying weekly while larger units can go 4-6 weeks. Urine containers typically need emptying every 2-4 days.
Plan for where you’ll empty waste. Most owners compost solids in an outdoor bin for 6-12 months before using them as soil amendment. Urine can usually be diluted (10:1 with water) and used as fertilizer on non-edible plants.
Winter and cold weather use
Composting slows significantly below 55 degrees F, and urine can freeze in the jug if temperatures drop below freezing. If you plan to use a composting toilet in an unheated space in winter, plan to either insulate the urine jug, add a small heating element, or move the toilet into a heated room.
Models with built-in heating elements (some Sun-Mar and BioLet units) help, but they add cost and power draw. For most off-grid owners, heating the bathroom itself is the simplest solution.
Cover materials and ongoing supplies
Coconut coir, peat moss, and sawdust all work as cover material. Coconut coir is the most popular because it’s renewable, breaks down quickly, and has a mild scent. A typical two-person household uses 1-2 cubic feet per month.
You can buy coconut coir in compressed bricks online or at garden centers for $10-15 per brick. Each brick expands to roughly 8 quarts when hydrated. That’s two months of supply for most users.
Installation and venting requirements
All composting toilets with fans need a vent pipe to the exterior, typically 2 inches in diameter. Self-contained units like the Nature’s Head include the vent fitting; wall-mounted units like the Separett Villa require you to plumb both the vent and a urine drain.
If you can’t drill through a wall, fanless models (TRELINO, NOMAD, WandaGO) avoid this requirement. That’s why they’re popular for renters and short-term van builds.
Budget and total cost of ownership
Initial prices range from $200 (NOMAD) to over $1,200 (Thinktank, Sun-Mar). Higher-priced units typically have better build quality, longer warranties, and more capacity. Lower-priced units are simpler but require more frequent emptying.
Don’t forget ongoing costs. Cover material runs $10-20 per month. Replacement fans, gaskets, and seals add up over years. A Nature’s Head owner on r/OffGrid reported $150 in maintenance costs over 5 years, which is reasonable.
Frequently Asked Questions
What are the drawbacks of composting toilets?
The main drawbacks of composting toilets are: more frequent maintenance than a regular toilet (you must empty solids and urine containers), the upfront cost ($200 to $1,200), the need for cover material like coconut coir or peat moss, and the fact that composting slows significantly in cold weather below 55 degrees F. You also can’t just flush and forget. Some users also find urine jugs awkward to empty and need to dispose of waste responsibly.
How often do you need to dump a composting toilet?
For two adults using a composting toilet full-time, you typically need to dump the urine container every 2-4 days and the solids bin every 1-6 weeks depending on capacity. Smaller portable units like the TRELINO Evo S need weekly solids emptying. Larger self-contained units like the Nature’s Head can go 4-6 weeks between solids dumps for two people. Single users can roughly double those intervals.
Do you throw toilet paper in a compost toilet?
Yes, you can throw regular toilet paper in a composting toilet. Most owners use single-ply or septic-safe toilet paper, which breaks down faster. Avoid thick quilted paper, baby wipes, feminine hygiene products, or anything labeled flushable. Those don’t compost and can clog the system. Some owners keep a small covered trash bin for items that don’t belong in the toilet.
What is the easiest compost toilet to use?
Based on our testing, the Thinktank Waterless Toilet is the easiest to use because it looks and feels like a regular toilet. The Nature’s Head is the easiest self-contained option with its spider handle agitator and large capacity. For portable use, the NOMAD by OGO is the simplest with no fan, no agitator, and standard 8-gallon bags. Ease of use depends on whether you prioritize comfort, automation, or simplicity.
What is better, an incinerating toilet or a composting toilet?
Composting toilets are better for most off-grid situations because they use far less electricity than incinerating toilets, which burn waste at high temperatures (1,000+ degrees F) using 0.5-1.5 kWh per cycle. Incinerating toilets cost more upfront ($3,000-$6,000) and require substantial electrical infrastructure. Composting toilets ($200-$1,200) are cheaper, use a small 12V fan, and produce usable compost. The exception is cold-weather full-time homes where incinerating toilets eliminate the slow-composting problem.
What is the best compost toilet on the market?
For most buyers, the Nature’s Head Self Contained Composting Toilet is the best overall option based on 1,100+ reviews averaging 4.5 stars, a 5-year warranty, and proven long-term reliability in vans, cabins, and tiny houses. For premium home use, the Thinktank Waterless Toilet offers the most residential experience. For portable and budget needs, the TRELINO Evo S delivers German build quality at $319. The right choice depends on your installation type and use case.
Final Verdict: Which Composting Toilet Should You Buy?
After 90 days of testing eight composting toilets across vans, tiny houses, and a remote cabin, the Nature’s Head Self Contained Composting Toilet remains our top pick for most buyers. It’s the most proven option with 1,100+ reviews, a 5-year warranty, and the best balance of capacity, odor control, and price.
If you want a residential-grade experience and can vent it properly, the Thinktank Waterless Toilet is the premium choice. For portable and budget use, the TRELINO Evo S delivers German engineering at under $320. Van builders should look at the OGO Origin for its compact footprint, and hunters and weekend campers will appreciate the simple NOMAD by OGO.
Whichever model you pick from our list of the best composting toilets in 2026, plan to buy a brick of coconut coir and a 12V power source (if your unit has a fan). That setup gets you odor-free composting from day one.
For van builders planning a full conversion, our guide to van bed platforms and convertible sleeping systems covers the rest of your layout. Happy off-grid living.