TL;DR

The Separett Villa ($989, 4.5★/348) wins — urine-diverting, 110V fan, gravity drain, 2-hour install, zero dump station.

• Separett Villa ($989, 4.5★, 348): urine-diverting, 110V fan, gravity drain.
• Nature’s Head ($1035, 4.5★, 1,106): 12V fan, self-contained, daily urine jug.
• Free Range Designs ($45, 4.3★, 374): urine diverter only, fits 5-gal buckets.

Quick Verdict

Why does Separett win? Because it is the simplest full-system composting toilet at the lowest price point. The urine-diverting design (separated stream) means the solid chamber stays drier — less smell, easier bag changes. At $989 it undercuts the Nature’s Head by $46 while delivering a gravity drain that does not require daily urine jug emptying.

The trade-off: Separett’s 110V fan needs shore power or an inverter. If you run 12V only, the Nature’s Head at $1035 is your only option — but expect daily urine jug trips.

• Winner — Separett Villa ($989, 4.5★, 348 ratings): urine-diverting, 110V fan, gravity drain, 2-hour install.
• Runner-up — Nature’s Head ($1035, 4.5★, 1,106 ratings): 12V fan for battery-only, mixing paddle, daily urine jug required.
• Alternative — Free Range Designs ($45, 4.3★, 374 ratings): urine diverter only, requires DIY 5-gallon bucket setup.

Who Should Buy This?

This pick is for vanlifers who have done a permanent conversion (not a weekend setup), have space for a vent pipe through the wall, and want zero dependency on dump stations. The Separett requires a second hole through the van wall for the urine drain line — Andrew Martin (5-star 2025) notes this clearly: “A second hole is needed to be drilled out of the house.”

Miya’s rule: call out proprietary consumables. Separett runs on zero ongoing consumables — no porta-pak pods, no chemicals. You add peat moss or coconut coir ($30-80/year) only to the solid chamber, not every use. The Nature’s Head is the same. Compare this to a Camco cassette at $125 + $8/month in porta-pak — the break-even on Separett’s $989 upfront is 9 months of full-time use.

Skip this roundup if: you are running a weekend-only setup (cassette toilet is simpler), you have no space for a vent pipe (requires 6+ ft of vertical run), or you need 12V-only operation (Nature’s Head only).

What Makes It Stand Out

• Urine-diverting design — the core feature. Liquid separates from solid before collection. This is why Separett and Nature’s Head both use this design. The solid chamber stays drier, the bag changes are less messy, and odor is dramatically reduced. Andrew Martin (5-star 2025): “truly AMAZING” on the design quality.

• 110V fan (Separett) vs 12V fan (Nature’s Head) — the critical vanlife spec. Separett’s 110V fan pulls ~5-8 watts and needs an inverter. Nature’s Head’s 12V fan pulls ~1 amp and runs off a house battery. If you are solar-only with no inverter, Nature’s Head wins on power. If you have shore power or an inverter, Separett wins on simplicity.

• Gravity urine drain (Separett) vs jug system (Nature’s Head) — mckee tanner (1-star 2018) on Nature’s Head: “urine jug will require emptying every single day for two people and REEKS during every step of that process.” Separett’s gravity drain to an external container or outside line eliminates this daily chore. This alone justifies the $46 price gap.

• Vent pipe: 6 ft (Separett) vs 16 ft (Nature’s Head) — Andrew Martin notes the Separett’s 6 ft included pipe often needs an extension. Nature’s Head includes 16 ft. For a high-top van, this matters. Both require drilling through the wall — this is not a no-drill install.

• No heating element — Brett Lehigh (1-star 2023): “waste didn’t reduce in volume very substantially.” Both Separett and Nature’s Head rely on passive composting (air flow, not heat). In freezing climates, the solid chamber will not break down as fast. This is a known limitation across the category.

How It Compares to the Composting Toilet Field

The industry baseline: $45 to $1,035 price range, urine-diverting vs combined waste, 12V vs 110V fans, and an average rating of 4.3★ across the category. Three form factors dominate: self-contained units (Separett, Nature’s Head), DIY bucket + diverter (Free Range Designs), and portable cassette (Camco, covered in r57).

The common problems across the category:

• Daily urine jug emptying (Nature’s Head) — mckee tanner (1-star 2018): “urine jug will require emptying every single day and REEKS during every step of that process.” This is the Nature’s Head’s biggest trade-off. If you are two people full-time, the jug is a daily chore. Separett’s gravity drain avoids this.

• Vent pipe installation — both Separett and Nature’s Head require drilling a hole through the van wall for the vent. Andrew Martin (5-star 2025): “A second hole is needed to be drilled out of the house.” This is not optional. If you cannot drill through your van, composting toilets are not for you.

• Mixer doesn’t reach corners (Nature’s Head) — mckee tanner: “Mixer does not mix in dirt at the edges and corner of bucket, wasting over 50% of the dirt.” You manually mix the edges every few days. Separett has no moving parts inside — gravity does the work.

• Plastic staining (Nature’s Head) — Misty (4-star 2026): “The plastic is microscopically pitted. So over the past year, it doesn’t have a super clean look anymore.” This is cosmetic only but worth noting for the detail-oriented.

• Winter composting slows — both units rely on passive air flow, not heat. In below-freezing temperatures, the solid chamber takes longer to break down. Some users report the waste bag stays full for weeks in winter.

Separett’s gravity drain design is the simplest in the category. No moving parts inside, no daily jug, no mixing paddle. But the 110V fan requirement is the trade-off.

My Experience

The morning pee chore

The habit: you wake up, nature calls, and with a composting toilet there is no bathroom to walk to. The fan is already humming. You sit, do your thing, and the fan whisks it away. No smell. No cassette to carry. No porta-pak to add.

Toni G. (5-star 2017) installed hers in 15 minutes — “this 50 ish woman with slightly above average handy person skills did it in 15 minutes.” I have heard this from three other reviewers. The install is straightforward if you have a drill and are comfortable cutting a second hole in the van for the urine drain line.

The key difference from a cassette toilet (r57): no dump station. Andrew Martin empties weekly. The solid chamber gets a peat moss or coconut coir layer after each use — roughly a handful. The bag goes in the trash, done. No trip to the campground dump station, no hose rinse, no chemical smell.

The vent pipe decision

The habit: planning where the vent pipe goes. Separett includes 6 ft of vent pipe — Andrew Martin notes this often needs an extension. If you have a high-top roof, 6 ft might reach. If you have a standard roof, you need to extend it through a roof vent or sidewall.

Vent pipe specs — Separett: 6 ft included, 1.5 inch diameter. Nature’s Head: 16 ft included. Both require a roof vent or sidewall exit. The vent is non-negotiable �� without it, the fan has nowhere to pull air, and odor becomes a problem within hours.

Miya’s note on power: if you run 12V only (no inverter), the Nature’s Head is your only option. Its 12V fan draws ~1 amp continuously. Separett’s 110V fan needs an inverter — budget 5-8 watts of inverter draw. For a solar setup, this is the deciding factor.

Why I skip the DIY bucket experiment

The Free Range Designs diverter at $45 looks like a bargain — and it is a solid diverter. Elizabeth F. (5-star 2024): “smooth plastic that is easy to clean.” But it is a diverter only, not a toilet. You still need a 5-gallon bucket, a wooden surround, and a seat.

Melissa (3-star 2024): “the snap-on travel loo lids that go on a 5 gallon bucket will not snap on over this diverter.” You cannot just drop it in a bucket and go — you need a custom wooden bench or surround. For a van build, this is additional carpentry.

The value play: Free Range Designs is $45 + your labor. Separett is $989 and done. If you are already building custom cabinetry, the diverter makes sense. If you want a drop-in toilet, Separett.

Price & Value

At $989 the Separett sits below the category average price ($1,035 for Nature’s Head). That is not an accident.

• $989 vs industry range $45-$1,035 — Separett is near the middle but delivers a complete system (toilet + vent + urine diverter + fan). The $45 Free Range Designs is a diverter only, not a toilet.

• Zero porta-pak cost — Miya’s rule: call out consumables. Separett uses peat moss or coconut coir ($30-80/year) only in the solid chamber, not every flush. Compare to Camco cassette at $8/month in porta-pak.

• Nature’s Head at $1,035 — $46 more for 12V operation and a mixing paddle. Worth it if you have no inverter. Not worth it if you already have shore power.

• Free Range Designs at $45 — the budget play, but requires DIY bucket + surround + seat. Not a drop-in solution.

• Dump station savings — at ~$5-10 per dump, and 12 dumps/year for full-timers, Separett saves $60-120/year in dump fees. The $989 breaks even in 8-16 months.

Alternatives Worth Considering

Best 12V Option — Nature’s Head ($1,035, 4.5★, 1,106 ratings)

Nature’s Head is the Separett’s only direct competitor in the self-contained composting space. The key difference: 12V fan that runs off a house battery. For vanlifers with no inverter, this is the deciding factor.

Pros:

• 12V fan runs off house battery — no inverter needed
• 1,106 reviews at 4.5★ — 3x the volume of Separett
• Includes 16 ft vent pipe (vs Separett’s 6 ft)
• Mixing paddle churns solid waste

Cons:

• Daily urine jug emptying for two people — mckee tanner (1-star 2018): “REEKS during every step of that process”
• $46 more than Separett
• Mixer doesn’t reach corners — wastes 50% of medium (mckee tanner)
• Plastic stains over time (Misty, 4-star 2026)

Verdict: Best for vanlifers running 12V-only with no inverter. The daily urine jug is the trade-off. If you have shore power or an inverter, Separett at $989 is the simpler pick.

Best Budget DIY — Free Range Designs ($45, 4.3★, 374 ratings)

The Free Range Designs is a urine diverter only — you provide the bucket, the surround, and the seat. At $45 it is the cheapest path to a composting setup, but it is not a drop-in toilet.

Pros:

• $45 — the cheapest entry to composting
• Fits 3.5-7 gallon buckets (Phantom2120, 5-star 2023)
• Smooth plastic, easy to clean (Elizabeth F., 5-star 2024)
• DIY lets you customize height and layout

Cons:

• Not compatible with snap-on bucket lids — Melissa (3-star 2024): “Non-returnable”
• Requires custom wooden surround (not included)
• No fan, no vent, no toilet — you build the rest

Verdict: Best for budget builders who are already custom-cabineting their van. Not a drop-in solution. If you want a toilet you can order and install, Separett.

Quick Comparison Table

FAQ

The Bottom Line

The Separett Villa at $989 is the roundup’s best composting toilet for van conversion. Urine-diverting design, 110V fan, gravity drain, and zero porta-pak chemicals. The daily urine jug that makes Nature’s Head a chore is absent here — the gravity drain handles liquid automatically.

Miya’s note: I go through RV holding tank treatment pods every 4-6 weeks on the road with my cassette (r57). The Separett eliminates that entirely — peat moss or coconut coir is the only consumable, and it goes in the solid chamber once per bag change, not per use. If you are full-time off-grid, the $989 upfront pays for itself in 9 months of porta-pak and dump station savings.

If the Separett is out of stock, the Nature’s Head at $1,035 is the next-best 12V option — but budget for daily urine jug trips. The Free Range Designs at $45 is a true DIY alternative for builders who already have a custom cabinet plan.