Sun-Mar Excel NE - Best Composting Toilet for Full-Time Home Use
The Sun-Mar Excel NE (Non-Electric) is designed for year-round residential use with up to three adults. The Bio-drum composting chamber mixes waste efficiently and the multi-chamber design lets partially composted material move to a finishing drawer while fresh waste continues composting separately. It requires no electricity for the composting process itself, though adding the optional fan kit improves odor management significantly in fully enclosed bathrooms. The unit is NSF-certified, which matters for permit applications in many states. Build quality is robust and replacement parts are well-supported.
Check price on Amazon →The best composting toilets for home use in 2026. These residential units replace or supplement traditional flush toilets without septic connections, ideal for off-grid cabins and eco-conscious homes.
Composting toilets for residential use have advanced well beyond the basic camp-style units of the past. Modern home composting toilets offer seat heights, bowl designs, and flushing experiences closer to conventional toilets while eliminating the need for water connections or septic hookups. The five picks below are chosen for ease of residential installation, odor management, and long-term reliability in year-round home environments.
| Product | Best For | Rating |
| — | — | — |
| Sun-Mar Excel NE | Full-time residential use | 4.7/5 |
| Nature’s Head Self-Contained | Cabins & secondary bathrooms | 4.7/5 |
| Separett Villa 9215 | Low-maintenance households | 4.6/5 |
| Sun-Mar Centrex 2000 | Central composting systems | 4.5/5 |
| BioLet 65A | Automated home composting | 4.4/5 |
Our methodology
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
Side by side
| Pick | Best for | Score | |
|---|---|---|---|
| Sun-Mar Excel NE - Best Composting Toilet for Full-Time Home Use | Check price | ||
| Nature's Head Self-Contained - Best for Cabins and Secondary Bathrooms | Check price | ||
| Separett Villa 9215 - Best for Low-Maintenance Households | Check price | ||
| Sun-Mar Centrex 2000 - Best Central Composting System | Check price | ||
| BioLet 65A - Best Automated Home Composting Toilet | Check price |
The full reviews
Sun-Mar Excel NE - Best Composting Toilet for Full-Time Home Use
The Sun-Mar Excel NE (Non-Electric) is designed for year-round residential use with up to three adults. The Bio-drum composting chamber mixes waste efficiently and the multi-chamber design lets partially composted material move to a finishing drawer while fresh waste continues composting separately. It requires no electricity for the composting process itself, though adding the optional fan kit improves odor management significantly in fully enclosed bathrooms. The unit is NSF-certified, which matters for permit applications in many states. Build quality is robust and replacement parts are well-supported.
Nature's Head Self-Contained - Best for Cabins and Secondary Bathrooms
The Nature's Head is compact enough for small bathroom footprints while handling regular residential use for one to two people effectively. Its stainless hardware and durable polyethylene construction hold up to years of use without corrosion or cracking. The urine-diverting design keeps the composting chamber dry, which controls odors and speeds the decomposition of solid waste using peat moss or coconut coir as a compost medium. It works well as the primary toilet in a cabin or as a secondary bathroom unit where usage is moderate. The 12V fan requirement is minimal and easy to run from standard household wiring.
Separett Villa 9215 - Best for Low-Maintenance Households
The Separett Villa 9215 distinguishes itself with its automatic rotating solids container, which eliminates the need for manual mixing or agitation. Biodegradable bags line the drum and contain the composted material for clean, mess-free emptying. The urine is diverted separately and can connect to a gray water drain or a small collection container. The seat height and bowl design are closer to a standard toilet, which reduces the adjustment period for family members accustomed to conventional bathrooms. It operates on 110V and the low-power fan runs continuously to maintain airflow.
Sun-Mar Centrex 2000 - Best Central Composting System
The Sun-Mar Centrex 2000 is a remote composting unit designed to be installed in a basement or utility room while connecting to a standard-looking toilet in the bathroom above. This central configuration makes it indistinguishable from a regular bathroom to visitors, while the composting happens out of sight in the mechanical room. It handles up to four adults for weekend use or two adults full-time. The separation of the toilet from the composting unit is a major practical advantage for homes where aesthetic integration matters. Installation requires a connection pipe between floors, which typically needs a contractor.
BioLet 65A - Best Automated Home Composting Toilet
The BioLet 65A automates much of the composting process with an electric mixing arm, heater, and fan system that together accelerate decomposition and evaporate liquid waste. The result is a nearly waterless system that requires emptying only a few times per year for average residential use. The automated operation means less real-world management compared to manual agitator units. It runs on standard 110V household power and is NSF-certified. The higher power consumption compared to passive units is a trade-off for the reduced manual maintenance schedule, making it well-suited for homeowners who prefer a set-and-forget approach.
What matters most
What to consider
Determine your daily user count first, since composting toilets have rated capacities and overloading accelerates odor problems and reduces composting effectiveness. Central remote units are better suited to full-time family homes where bathroom aesthetics matter. Self-contained units are more practical for cabins, secondary bathrooms, or accessory dwelling units. Verify local permit requirements before purchasing, and check whether the model you choose carries NSF certification, which simplifies the approval process significantly. Plan your vent pipe routing early in the installation process since it determines where in the home the unit can be placed.
What to consider
For related reading, see [best composting toilets for off-grid living](/articles/best-composting-toilet-for-off-grid) and [best composting toilets for van life](/articles/best-composting-toilet-for-van-life). Review our product evaluation process at [/methodology](/methodology).
Frequently asked
A properly installed and maintained composting toilet should produce very little odor. The ventilation fan creates negative pressure inside the unit, drawing air down through the bowl and out through the vent pipe before it can escape into the bathroom. Odors typically indicate a blocked vent, incorrect liquid diversion, or overloaded composting chamber. Following the manufacturer's maintenance schedule keeps odors minimal.
Permit requirements vary widely by state and county. Some jurisdictions classify composting toilets as an approved alternative sanitation device and require only a simple permit, while others require a full alternative septic approval process. A handful of states still restrict or prohibit them entirely. Check with your local building department before purchasing a unit intended for permanent residential installation.
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