Availability: this system is Special Order, please enquire about procurement timeframes.
Sun-Mar™ Spacesaver 240
Designed for 1 person full-time and up to 3 people part-time, Sun-Mar™ Spacesaver 240 is a compact model made for small spaces. It is a strong choice for baches, sleep-outs, cabins, and similar locations where reliable power is available.
Featuring Sun-Mar’s™ patented Bio-drum™ technology, the Spacesaver is a true composting system that processes compost in two stages within the unit itself. It uses Sun-Mar’s™ Three-Chamber Design to stage composting and support effective separation of composting, evaporation, and finishing functions.
Capacity and Best Fit
- Full-time use: 1 person
- Part-time use: up to 3 people
- Best suited to: tiny homes, sleep-outs, sheds, cabins, and baches with reliable power access
Core Product Details
- Patented Bio-drum™ composting process
- Sun-Mar™ Three-Chamber Design
- Active fan ventilation for aeration and low-odour performance
- 2" vent attached at the top rear of the unit
- 1" emergency drain for overflow protection
- Detachable footrest for easier finishing drawer access
- Electrical rating: 240 Volt AC
Performance and Certifications
Sun-Mar™ composting toilet systems are CSA certified for electrical features under CSA file number LR55925.
NSF/ANSI 41 Standard — Non-Liquid Saturated Treatment Systems
This system is certified for liquid containment, odours, and solid end products.
To simulate residential use, the Spacesaver was tested by the National Sanitation Foundation (NSF) at maximum capacity for 6 continuous months, during which it produced no odour and a clean, safe compost.
NSF: What you need to know about composting toilets

WCTNZ® is the exclusive authorised distributor of Sun-Mar™ composting toilets in New Zealand. All Sun-Mar™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties, and come with comprehensive local customer support—making us New Zealand’s trusted source for sustainable, waterless composting toilet solutions.
Before you choose, think:
1. Your place — tiny home, bach, family home, RV, or public site
2. Your building — whether it suits a self-contained or split composting toilet system
3. Your needs — user numbers, maintenance preferences, and how off-grid you want to be
To narrow it down properly, start with the Composting Toilet Guide.
Open the WCTNZ® Selector Guide »