6 Best Urine-Diverting Toilets for Off-Grid Living

The last thing you want to worry about in your remote cabin is a failing septic system. Urine-diverting toilets are the key to true water independence and off-grid resilience. They turn waste into a resource, closing a loop most people never even think about.

08/24/2026 11:24 am GMT

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Urine-Diverting Toilets & Off-Grid Freedom

At its core, a urine-diverting toilet does one simple thing: it separates liquids from solids. This single act is a game-changer for off-grid living. By keeping urine out of the solid waste, you virtually eliminate the foul sewage smell and stop the creation of blackwater.

This separation is the foundation of self-reliance. You no longer need a septic tank, a leach field, or even a blackwater holding tank in your RV or van. Your water usage plummets. Instead of managing a hazardous slurry, you’re left with two distinct, manageable substances: a nitrogen-rich liquid fertilizer and a solid material that can be safely composted.

This isn’t just about being "eco-friendly," though it certainly is. It’s a deeply practical decision. You’re simplifying your infrastructure, reducing your dependence on municipal services, and taking direct control over a fundamental part of your life. It’s a powerful step toward a truly independent homestead.

Nature’s Head: The Rugged, Go-To Standard

You see the Nature’s Head in countless skoolies, cabins, and sailboats for a reason. It’s built like a tank. The construction is robust, the stainless steel hardware resists corrosion, and the overall design prioritizes function over form.

Its defining feature is the large side-mounted "spider" handle for agitating the solids. It’s a simple, effective mechanism that does a great job of mixing the composting medium. The solids bin is also one of the largest on the market, meaning a single person might go six to eight weeks between emptying. For a couple, you’re still looking at a month or more.

The tradeoff is its size and utilitarian aesthetic. It’s one of the bulkier units, and it won’t win any design awards. But if your primary concerns are durability, high capacity, and proven reliability, the Nature’s Head is the undisputed industry standard. It’s for the builder who needs something that just plain works, every single time.

Air Head Toilet: Compact Design for Tight Spaces

If the Nature’s Head is the rugged workhorse, the Air Head is its more compact cousin. It was designed specifically for the tight confines of marine environments, making it a perfect fit for van conversions and tiny homes where every inch counts. Its rounded shape and smaller footprint can make a huge difference in a tiny bathroom layout.

Instead of a side crank, the Air Head uses a smaller, removable handle on the top or front to turn its agitator. The whole unit feels more integrated and less industrial than some of its competitors. This is the toilet you choose when you’re measuring your floor plan with a tape measure and realize you just don’t have the width for a larger model.

Of course, a smaller footprint means a smaller capacity. You’ll be emptying the solids bin more frequently than you would with a Nature’s Head. The choice between the two often comes down to a simple question: do you want to prioritize a longer interval between maintenance, or do you need to save six inches of precious floor space? In a 70-square-foot van, the answer is usually clear.

OGO Compost Toilet: Automated & Modern Solution

The OGO breaks the mold of what a composting toilet "should" look like. Its sleek, cube-like design and push-button operation bring a modern sensibility to off-grid sanitation. This is the unit for people who want functionality without sacrificing aesthetics.

Its standout feature is the electric agitator. With the press of a button, a small motor spins and mixes the solids, eliminating the need for a manual crank. The urine bottle is also cleverly designed to slide out from the front, making it easy to empty without any awkward lifting or disassembly. It’s a thoughtful, user-friendly design from top to bottom.

This convenience comes with a consideration: power. The electric agitator and fan require a constant 12V connection. While the draw is minimal, it’s another load on your electrical system. For a robust off-grid setup, this is a non-issue. But if you’re running a very lean power system, the added complexity and potential point of failure are worth weighing against the undeniable convenience.

Separett Tiny: A Sleek, Waterless Option

The Separett Tiny operates on a slightly different principle. While it diverts urine, it isn’t a self-contained composting toilet. Instead, it functions as a simple, waterless collection system. Solids are collected in a bucket lined with a compostable bag, and urine is routed to an external holding tank or a small drain.

The major advantage here is simplicity and cleanliness. There is no composting medium to add and no agitator to crank. When the solids bin is full, you simply remove the bag and replace it. The toilet itself is slim, lightweight, and looks much more like a conventional toilet, which can be a big plus for some people.

The key tradeoff is in the waste management process. You aren’t creating finished compost inside the unit. You are managing bags of solid waste that must be composted in a separate, dedicated outdoor pile or disposed of according to local regulations. This makes it an excellent choice for those with a larger homestead and a proper composting setup, but less ideal for a van lifer who needs a fully self-contained system.

C-Head Toilet: Simple, Customizable Design

The C-Head is the pragmatist’s choice. It’s a no-frills, incredibly simple, and highly effective toilet built around a basic bucket system. Designed by a fellow boater, its focus is on pure function, repairability, and affordability.

The design is essentially a sturdy, compact box with a urine-diverting seat on top. The "churn" style agitator is dead simple and effective. Because of its straightforward construction, it’s easy to understand, clean, and maintain. There are no complex parts to break or replace.

One of its greatest strengths is its adaptability. The builder offers several different sizes and configurations to fit various spaces. Furthermore, its simple box shape makes it incredibly easy for a DIYer to build a custom enclosure around it, integrating it seamlessly into a bench or cabinet. If you value function over form and want a bulletproof system without a high price tag, the C-Head is a fantastic, unpretentious option.

Kildwick DIY Kits: Build Your Own Custom Toilet

For the ultimate in customization and cost-savings, nothing beats a DIY kit. Companies like Kildwick provide the most critical component: the urine diverter. This molded separator is the heart of the system, and building a box around it is a straightforward woodworking project.

The advantage is total control over the final product. You can design the toilet to the exact dimensions of your space. You can build it into existing furniture, match the wood to your cabinetry, and choose the exact buckets and fans you want to use. This is how you get a perfectly integrated toilet without paying for a fully custom solution.

This path isn’t for everyone. You need the tools, skills, and time to build a solid, well-sealed box. A poorly constructed toilet can lead to odor problems and be difficult to clean. But if you’re already building out a van or cabin, constructing your own toilet is a relatively small and rewarding project that gives you a custom fit for a fraction of the cost of a pre-built unit.

Choosing Your Toilet: Key Off-Grid Factors

There is no single "best" urine-diverting toilet. The best one is the one that fits your specific needs, space, and lifestyle. Rushing this decision is a mistake; think through your daily reality before you buy.

Start by evaluating these key factors. Be honest with yourself about your priorities and limitations.

• Space & Footprint: Do you have room for a bulky, high-capacity unit (Nature’s Head), or does every square inch matter (Air Head, Separett Tiny)?
• Power Availability: Is your 12V system robust enough to reliably power a fan and an electric agitator (OGO), or do you need a completely powerless option?
• Capacity & Users: How many people will be using it full-time? Are you willing to empty it more frequently for a smaller size, or is maximum capacity the goal?
• Maintenance Style: Do you prefer the hands-on approach of managing a composting medium (Nature’s Head, OGO), or the simple, clean process of swapping a bag (Separett)?
• Budget & DIY Spirit: Are you looking for a ready-to-install unit, or are you comfortable building your own box to save money and get a custom fit (Kildwick DIY)?

Ultimately, your toilet is a tool for self-reliance. Choosing the right one removes a major source of complexity from your off-grid life. Consider how you live, how you travel, and what level of maintenance you’re truly comfortable with. That’s how you make the right choice.

Choosing a urine-diverting toilet is more than a plumbing decision; it’s a declaration of independence. It’s about taking ownership of your resources and designing a more resilient, sustainable life. Get this choice right, and you’ve built a solid foundation for true off-grid freedom.

Frequently Asked Questions (FAQs)

What is a urine-diverting toilet and how does it work?

A urine-diverting toilet is a non-flush sanitation fixture that mechanically routes liquid and solid human waste into separate holding compartments through a specially contoured bowl. The front section directs urine through a drain pipe or bottle, while the rear chamber collects solids for desiccation or composting. Separating liquids from solids prevents anaerobic decomposition, which eliminates the primary source of sewage odors. Users must sit down to ensure proper alignment with the diversion channels.

What does a urine separator insert do in a dry toilet?

Urine separator inserts are contoured funnels installed beneath a toilet seat to channel liquids into a front drain while allowing solids to drop straight down. DIY builders use these inserts to convert ordinary buckets or wooden outhouse boxes into odorless dry toilets without buying expensive pre-built systems. They usually attach directly to standard 1.25-inch or 1.5-inch PVC plumbing or drain hoses that lead to external storage jugs.

How do you clean and maintain a urine-diverting toilet in a tiny house?

Cleaning a urine-diverting toilet requires spraying the diversion bowl daily with a diluted vinegar-and-water solution and wiping it with a microfiber cloth. Mix equal parts white vinegar and water in a spray bottle to dissolve uric acid crystals without killing the beneficial microbes in your solids bin. Avoid bleach or harsh chemical cleaners, as they degrade plastic diverters and halt natural composting. Flush the urine funnel weekly with warm water to prevent scale buildup in the drainage hose.

How often do you have to empty an off-grid urine-diverting toilet?

Off-grid urine-diverting toilets require emptying the liquid container every two to three days and the solid waste bin every three to six weeks for two full-time users. Urine tanks fill quickly because an adult produces roughly 1.5 liters of liquid waste per day. Solid waste takes longer to accumulate because covering materials like coconut coir or sawdust help compact and dehydrate the material. Cabin owners using external drainage pits or soakaway trenches only need to manage the solids container.

Is a urine-diverting toilet better than a standard composting toilet for cold climates?

Separating urine from solid waste makes urine-diverting toilets perform better than standard composting toilets in cold climates because dry waste does not freeze into an unmanageable sludge. All-in-one composting toilets keep liquids and solids together, requiring constant heat above 55 degrees Fahrenheit to evaporate moisture and sustain bacteria. When unheated cabins drop below freezing, saturated waste freezes solid and halts the process. Separating the urine leaves dry solids that remain manageable and odorless even in unheated winter outbuildings.

How much does a urine-diverting toilet cost for off-grid cabins?

Retail urine-diverting toilets for off-grid cabins cost between $600 and $1,500 for complete, manufactured systems with integrated 12-volt ventilation fans and liquid containers. Premium self-contained brands like Separett or Nature’s Head sit at the upper end of that price spectrum, ranging from $950 to $1,400. Budget-conscious builders can assemble a DIY urine-diverting setup for $80 to $200 by purchasing a standalone separator funnel, a five-gallon bucket, and a small computer cooling fan.

Why does my urine-diverting toilet smell like ammonia?

Ammonia odors develop in a urine-diverting toilet when standing urine undergoes bacterial hydrolysis or when urine accidentally splashes into the solids collection bucket. Inspect the drain hose for kinks or crystallized blockages that trap stagnant liquid inside the line. If the solids container smells of ammonia, verify that all household members sit down to use the toilet and add two extra cups of dry carbon material, like peat moss, to absorb excess moisture.

Are urine-diverting toilets legal for off-grid homes in the United States?

Building codes in the United States generally permit urine-diverting toilets if the local jurisdiction has adopted the International Private Sewage Disposal Code or alternative sanitation ordinances. States such as Oregon, Washington, and Colorado maintain clear regulatory frameworks for dry toilets, whereas other counties require an approved septic system on the deed regardless of toilet type. Always consult your local county health department or building code official to confirm specific graywater disposal and human waste composting rules before installing your unit.