Every tiny home needs a toilet that works without a sewer connection, and the two main off-grid choices are composting toilets and incinerating toilets. Both are water-free and legal in most areas, but they work in very different ways, cost very different amounts, and suit different kinds of owners. Choosing wrong means daily frustration, so it is worth comparing them properly.

A composting toilet separates liquids from solids, uses no water, and produces compost that can go back into non-edible garden beds after six to twelve months of curing. The two best-selling models in 2026 are the Nature's Head, at around 1,050 dollars, and the Separett Villa 9215, at around 1,100 dollars. The Nature's Head uses a hand crank to mix the compost, while the Separett bags solids for easier disposal but does not actively compost inside the unit. A budget do-it-yourself option uses a urine-diverting seat, a five-gallon bucket, and coconut coir, for about 200 dollars total.

An incinerating toilet, like the Cinderella, burns waste at high heat and leaves only a small amount of sterile ash. There is no compost to empty, no smell, and no handling of waste at all. The trade-off is cost and energy: units run 3,000 to 5,000 dollars, and each cycle uses significant electricity or propane. They are the cleanest option in daily use, but the most expensive to buy and run.

Upfront, a composting toilet costs 900 to 2,000 dollars, while an incinerating toilet costs 3,000 to 5,000 dollars. Running costs flip the picture: composting costs almost nothing beyond cover material and a few watts for the fan, while incinerating costs real money in electricity or propane on every use. Over five years, composting is usually far cheaper unless you value the zero-handling convenience highly.

Choose a composting toilet if you are comfortable emptying a chamber every few weeks, want the lowest cost, and have a place to cure compost. Choose an incinerating toilet if you want the closest thing to a normal flush toilet, have reliable power or propane, and are willing to pay for convenience. Full-time off-gridders on a budget almost always choose composting; weekend cabins and owners who hate maintenance often choose incinerating.

There is no wrong answer, only a wrong fit. Match the toilet to your budget, your tolerance for maintenance, and your power situation, and either option will serve a tiny home well for years.

Installation matters as much as the model you choose. A composting toilet needs a vent pipe that runs straight up through the roof, ideally with no bends, and a small 12-volt fan that runs continuously to pull moisture and odor outside. Place the toilet where the vent run is short, and seal every joint with silicone so humid air cannot leak into the wall. An incinerating toilet needs a vent too, plus a dedicated electrical circuit or a propane line, and a clear path for the ash pan to be removed. Both types need a level floor and a few inches of clearance around the unit for servicing.

Maintenance is the other half of the decision. A composting toilet needs the solids chamber emptied every few weeks, the liquids bottle emptied every few days, and a scoop of cover material after each solid use. It takes about five minutes a week once you have the routine. An incinerating toilet needs the ash pan emptied every few weeks, the bowl liner replaced after each use, and an occasional deep clean of the burn chamber. Neither is hard, but the composting routine is more hands-on and the incinerating routine is more expensive. Choose the one whose chores you will actually do.