If you're building a tiny home, off-grid cabin, or rural property in New Zealand, choosing the right toilet system is one of the most important decisions you'll make.
Two of the most common options are composting toilets and incinerating toilets. Both are waterless and suitable for properties without traditional plumbing—but they offer very different experiences.
This guide explains how each system works, the key differences, and which is better for your situation in NZ.
What Is a Composting Toilet?
A composting toilet is a waterless system that breaks down waste naturally using airflow, bacteria, and time.
In most setups:
- Liquids and solids are separated
- Organic material is added
- Waste decomposes into compost
Composting toilets are widely used in tiny homes and off-grid properties across New Zealand.
What Is an Incinerating Toilet?
An incinerating toilet is a waterless system that burns waste at high temperatures, reducing it to a small amount of sterile ash.
- No composting process
- No accumulation of waste
- No handling of raw material
The system operates in a sealed chamber and eliminates waste completely after use.
Key Differences: Composting vs Incinerating Toilets
1. Maintenance and Effort
Composting toilets require ongoing, hands-on management. Users need to:
- monitor moisture levels
- add bulking material (e.g. sawdust or coco coir)
- manage ventilation and airflow
- regularly empty and handle compost
- ensure proper separation of liquids and solids
If not maintained correctly, performance and odour can quickly become an issue.
Incinerating toilets require low but structured maintenance. This includes:
- using liners for each use
- occasional ash removal
- periodic cleaning or rinsing of components such as the catalytic converter
While incinerating systems are still significantly easier to manage day-to-day, they are not completely maintenance-free.
2. Odour in Small Spaces
Odour control is critical in tiny homes and cabins.
Composting toilets can produce odour if not maintained correctly or if airflow is insufficient.
Incinerating toilets use a sealed system and ventilation, which means no smell inside the home under normal use.
3. Installation Requirements in NZ
Both systems are suitable for off-grid setups in New Zealand, but installation differs.
Composting toilets:
- No plumbing required
- Require ventilation
- May need drainage or external setup depending on model
Incinerating toilets:
- No plumbing required
- Require power (electric or gas)
- Require a flue or vent system
Both can be installed in tiny homes, baches, and rural properties.
4. Running Costs
Composting toilets:
- Lower upfront cost
- Require time and ongoing management
Incinerating toilets:
- Higher upfront investment
- Require energy for operation
The trade-off is between cost and convenience.
5. Hygiene and User Experience
Composting toilets involve handling decomposing waste over time.
Incinerating toilets eliminate waste completely, leaving only sterile ash.
For users who want a more conventional, hygienic experience, incineration is often preferred.
Which Is Better for Tiny Homes in New Zealand?
There is no single answer that suits everyone, but there are clear use cases.
Composting toilets are better if you:
- Want the lowest upfront cost
- Are comfortable managing a system
- Prefer a non-powered solution
Incinerating toilets are better if you:
- Want a low-maintenance setup
- Prefer not to handle waste
- Need a clean, odour-free indoor environment
- Are building a higher-end tiny home or off-grid system
What Works Best in NZ Conditions?
In New Zealand, many off-grid and rural properties face:
- limited infrastructure
- variable climates
- remote locations
Both systems can work, but incinerating toilets are often chosen for:
- ease of use
- reliability
- consistent performance regardless of conditions
Frequently Asked Questions
Do composting toilets smell?
They can if not maintained properly or if airflow is insufficient.
Do incinerating toilets smell?
No. They use sealed systems and ventilation to eliminate odour.
Do either require plumbing?
No. Both are waterless systems.
Which is better for a tiny home in NZ?
Both are used, but incinerating toilets are often preferred for convenience and hygiene.
Final Thoughts
Choosing between a composting toilet and an incinerating toilet depends on your priorities.
If you are looking for a low-cost, hands-on system, composting may suit your needs.
If you want a clean, low-maintenance solution that requires minimal involvement, an incinerating toilet is often the better long-term option—especially for tiny homes and off-grid living in New Zealand.
