Composting Toilets

Sun-Mar offers a broad lineup of composting toilets designed for off-grid, seasonal, tiny-home, cottage, and remote use. With models ranging from ultra-compact to high-capacity centralized systems, there’s a Sun-Mar that fits nearly every user, space constraint, and usage pattern.

Built for Efficiency

• Zero or Low Water Use – All Sun-Mar models are waterless, eliminating the need for plumbing, septic, or a water supply for flushing.

• Power Draw – Some models are completely non-electric, while others with fans and heaters use about 110–150 watts on average when the heater is running.

• Low Voltage Options – Non-electric models can be paired with low-voltage or solar-compatible fans if additional venting is needed.

• Large Composting Capacity – Higher-capacity systems can hold compost through an entire season for multiple users, reducing frequency of emptying and overall maintenance.

Wide Range of Models

• Excel and Excel NE – Larger self-contained models suited for full-time off-grid homes or cottages, with non-electric options for power-limited sites.

• GTG – Compact, urine-diverting unit perfect for tiny homes, vans, or very limited spaces.

• Compact and Spacesaver – Smaller self-contained models designed for 1–2 adults or seasonal use in tighter installations.

• Centrex Systems – Centralized composting systems built to handle heavier loads and multiple bathrooms, ideal for larger households or seasonal camps.

Why Sun-Mar?

• Longstanding reputation as a leader in composting toilet technology

• Options for both non-electric and electric/heated models

• Strong odor control and effective ventilation design

• Scalable solutions from small cabins to larger family homes

With Sun-Mar, you can choose the size and style that matches your needs while cutting water use, simplifying waste management, and making off-grid living more sustainable and comfortable.