Since the 1970s Sun Mar has been making self contained toilets for the purpose of composting human waste into fertilizer in a convenient, odor-free contained unit.
Sun Mar has continued to innovate new technologies for the most efficient composting possible, leading to the first-class technology used in the toilets Sun Mar makes today.
For the best composting toilet, that can turn human waste into fertilizer, the Sun Mar’s Excel non-electric toilet is the best option for off-the-grid living.
The incredibly efficient ability of this toilet to transform human waste into compost for plant fertilization requires no electricity and happens quietly and unobtrusively.
The design of the toilet is low profile so it seems unobtrusive no matter how small your space, and it attractively compliments your design.
Since this toilet uses no water it is beneficial to the environment and makes using it easy on you as well.
In A Rush? Here’s our winner…
icon-star Non-electric model; ideal for applications off the grid
icon-star Low profile unit complements any bathroom
icon-star Uses no water
icon-star 100% non-polluting
The Excel toilet made by Sun Mar is the best fully composting toilet available.
While its price around $2,000 maybe difficult to swallow, this toilet can make you feel confident that you are doing right by the environment and also making a wise investment for your boat, RV, or tiny home.
The Nature’s Head (Check Price on Amazon.com) toilet is extremely compact and self-contained, designed for a harsh marine environment and capable of withstanding whatever conditions you will subject it to.
At around $1,000, it is about half the price of most composting toilets.
While it does not completely compost, it does provide the first stages of decomposition and a secure, odor-free storage area for waste.
If you have access to electricity at least part of the time that you will be using your composting toilet, the Villa 9210 (Check Price on Amazon.com) may be the perfect toilet for you.
This clever toilet can take power from a battery, a solar resource, an AC adapter or a 12 volt DC power source.
This is the best composting toilets for tiny houses or other small spaces.
How to Choose the Best Composting Toilet
Planning for toilet needs is not the most fun part of planning your road trip, boat, RV, or tiny house, but toiletry is an essential component of your vacation or home away from home.
While you can make a DIY composting toilet, a composting toilet that does not work properly can leave your space smelling like a bathroom, or failing to do the job that it was intended for.
There are many decisions to be made in choosing a composting toilet, including the size that you can fit in your space, the amount of smell you can tolerate, and the degree of composting that you require.
Portable toilets allow you to transport waste from your toilet to an appropriate compost container.
Such toilets are much more affordable than fully composting toilets, but still allow you to have the experience of using a comfortable toilet and locking away both waste and odor.
Some toilets provide some degree of composting, but require you to empty them to finish the composting process.
Such toilets are a little bit more affordable than fully composting toilets, and give you the option of emptying them whenever they become full.
Such toilets are a good option for an RV composting toilet.
Fully composting toilets are the most expensive and can allow a single person who uses the toilet minimally to empty it, and provides fully composted fertilizer for immediate garden use.
While it may be tempting to opt for a fully composting toilet, remember that this will be a significant investment at around $2,000, and you are unlikely to really reap the benefits of a fully composting toilet if you use the toilet the way most families would.
It may be better for you to get a toilet that you can empty into an appropriate composting container, so that the toilet can always be ready to use.
1. Sun-Mar Excel Non-Electric Self-Contained Composting Toilet
This powerful Sun Mar composting toilet offers excellent composting of human waste into compost suitable for fertilizing plants using no electricity.
This makes it a perfect toilet for anyone who needs an off the grid toilet in their tiny house, boat, or RV.
The low profile design of this toilet will complement any bathroom decor and not seem obtrusive in small spaces.
This toilet uses no water, which is beneficial for the environment since it preserves water and reduces waste water being released into the environment, and can also be extremely important in situations in which water is difficult to access such as on a boat or in a tiny house.
The composter includes a variable diameter bile drum that has a recessed handle to help you process compost with ease.
At around $2,000, this Sun Mar toilet is a serious investment for your home, RV, or both.
This model is designed for medium to high capacity use, good for two to three people in a residential setting using it full-time or five to seven people for short-term use.
This toilet is entirely self-contained and runs without needing to use electricity.
2. Nature’s Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
This extremely compact little toilet by Nature’s head is proudly made in the USA and is made to extremely compact dimensions so it is perfect for even the smallest spaces.
Despite the extremely compact design, this toilet manages to feature a full-sized elongated seat so you will be as comfortable sitting on it as you would be on your toilet at home.
This toilet was designed to withstand a harsh marine environment, so it can make it through whatever environment you put it in.
This toilet is built to eliminate foul odors by utilizing a low volume air circulation fan that makes both the toilet and the entire space smell better.
This toilet is easy to disassemble and empty, so you can put waste into a composting container easily.
While this toilet does not compost itself, it keeps waste contained and eliminates odor until you are able to empty waste into a composting container.
A limited warranty of 5 years can make you feel confident about buying this toilet.
This is good since the investment around $1,000 is significant. This is still not nearly as much as you would spend on a fully composting toilet, however.
3. Villa 9210 DC/AC
This clever toilet by Villa is designed to accept 12 volt DC power from either a battery or a solar resource, or you can utilize the included AC adapter with standard AC power.
This versatile toilet is perfect if you are living off the grid, or if you are traveling and sometimes utilize solar, and sometimes need to use AC power.
This is a common unit for tiny houses since the fan draws out air fast for small spaces.
If you are shopping for a composting toilet for your tiny house, or other very small space, this may be a great option for you.
This toilet is designed to capture urine, which is then plumbed to a grey water system or a holding tank.
Paper and solid waste is contained within the solid waste holding area in a compostable liner bag.
The vent fan pulls the air over the solid waste holding area, drying the solid waste and venting odor out of your space.
After several weeks of use, the compostable bag can be removed and deposited in a composter or disposed of appropriately.
By using this method you can avoid trying to fully compost in the toilet itself, a system that is prone to failure.
4. Sun-Mar Compact Self-Contained Composting Toilet
This extremely compact composting toilet by Sun Mar offers a low profile design that can blend into any bathroom or small space.
This composting toilet uses no water and will not cause any pollution, so you can feel good about using this toilet.
A variable diameter bio drum with a recessed handle allows you to easily process compost.
This composting toilet runs on standard household current, so it is best for situations in which you have access to standard electricity.
This toilet can effectively, and without odor convert human waste into safe fertilizer for the soil.
This model costs around $2,000, and is best for a single person in a residential setting, or several people for brief periods.
This composting toilet is entirely self-contained, will lock in odors and prevent leaks, and is pest proofed.
This toilet produces a gentle hum while it works, but most people do not find the sound to be too distracting.
This toilet does an excellent job of eliminating odor and looks appropriate with other household bathroom fixtures.
5. Nature’s Head Dry Composting Toilet
This clever composting toilet by Nature’s Head offers an innovative design for a good value.
While at just under $1,000, this toilet isn’t cheap, it does offer many of the features of more expensive toilets for a reasonable price.
If this will be your primary toilet, or even if it is an important accessory to your RV or both, it is worth the investment into a high-quality composting toilet.
This toilet is entirely self-contained, and allows for waterless operation. This toilet diverts urine for convenient cleaning and less frequent emptying.
A waterless composting toilet is incredibly important when water is a valuable resource, such as in an RV with limited holding resources, on a boat, or in any other living situation in which water must be brought in.
This toilet is lightweight for convenient transportation and so it will not affect the overall weight of your RV or boat, and it has an odorless design that will allow you to use it within your space without an unpleasant smell.
This toilet has a stainless steel, robust construction that can withstand even the harshest conditions while still offering the best in user experience.
Nature’s head prides themselves on manufacturing in the USA, and providing exceptional customer service.
6. Weekend 7010
The Weekend by Separett is an incredibly sleek and compact composting toilet.
This is an excellent toilet to consider when space is very restricted. The Weeknd can connect to DC, use battery power, or utilize an AC adapter, so you have versatility in your toilet.
The Weekend uses urine diversion to keep urine separate from solid so you can empty less often and so urine will not contaminate solid compost.
Other than the ventilation fan, the Weekend does not have moving parts, so it is more likely to last.
This model does not offer a concealment screen, as the company’s other model, The Villa, does.
When you open the toilet seat, you can see into the solid waste holding area. This may be off-putting to some users, especially if guests will be using the toilet.
This toilet comes with everything it needs to connect to venting so that your space will remain odor-free.
This toilet is perfect for light use, for people who need a composting toilet to store waste in between emptying after uses over several day periods for few people.
7. Dry Toilet by Sun-Mar Corp
This sleek little toilet by Sun-Mar Corp has a seat height of 15 in and a regular size toilet seat so that you will feel as comfortable using this composting toilet as you would using a traditional toilet.
The AF waterless kit can be purchased separately. The vent system on the AF unit continuously draws air down into the toilet and into your composting tank so that odor never drifts up into your space.
If the toilet is too high above your composter for the air to be sufficiently drawn down, the dry toilet can also be directly vented by installing a 3 inch or 4 inch vent pipe to the rear of the toilet and attaching a 12 volt fan to enhance air flow.
Every dry toilet comes with a bowl liner that fit under the seat and can be removed for cleaning as necessary. This toilet is manufactured from durable and sturdy fiberglass so that you can be confident that it will last for a long time.
Since this toilet itself does not require electricity, if you go periods without electricity but have electricity at other times, you can use this toilet until you can hook up to electricity to activate the fan.
8. Porta Potti Curve Portable Toilet
Porta-Potty is a well-known name in portable toilets, and this is their smallest, slimmest, version.
Whether you need a toilet on the road, on the water, or at home, this portable toilet from Porta-Potty can meet your needs.
While the Porta Potti Curve doesn’t compost waste, with up to 56 flushes per tank you may not miss a composting feature.
The design of the Curve will make you feel like you are using your toilet at home, while the comfortable seat height and battery powered flush will offer you convenience on-the-go.
The Curve separates for easy access to both holding tanks.
The improved water tank handle allows you to carry the toilet and pour easily out of the pivoting spout. The Curve’s tanks are easy to clean for long-term maintenance.
An integrated holder keeps the toilet paper conveniently attached to the Curve, so you will never be left wondering where your toilet paper is.
Toilet paper can be closed away and kept clean and out of sight when not in use.
It is easy to monitor the holding tank using the level indicator, to see when you will need to change the fresh water in the waste tank.
9. Camco Standard Portable Travel Toilet
This convenient portable toilet by Camco is designed for camping, RVing, boating, or any other recreational activity for which you may require a portable toilet.
The 5.3 gallon capacity toilet weighs only 11.5 pounds when it is empty but can support people weighing up to 330 lb.
The top half of the tank holds 2.5 gallons of fresh water and has a convenient cap that can be removed to fill the flush tank with clean water when needed.
A bellows-type pump works to flush water from the tank into the bowl to remove waste.
Both sides of this toilet feature latches to secure the toilet to the waste tank.
On the bottom half of the waste tank, a sliding gate valve opens for waste and closes to create a seal to prevent odors or leaks from escaping.
The contents of the tank can be easily emptied into a separate composter using a removable cap.
The sides of the top and the bottom of this toilet have handles for convenient transport.
While this is not a true composting toilet, if the cost of composting toilets is too much for your budget, and you think a portable toilet made meet your needs, the Camco standard portable travel toilet may be a good option for depositing waste and for transporting to a composting container.
10. PARTYSAVING New Travel Outdoor Camping Boat Portable Toilet
This compact little toilet by Party Saving is entirely self-contained so you can feel confident that there will be no leaks or problems with your portable toilet.
The square toilet is simple in appearance but is well designed, made of a high density polyethylene.
The spacious fresh water reservoir means that you can feel confident that you will have plenty of water to meet your needs, while the separate waste tank that is included keeps waste well away from the water reservoir.
This toilet can support people who weigh up to 250 lb, so it will meet the needs of most people.
The side valve of this toilet provides a tight seal to lock in odors and protect against any chance of leakage.
This is the perfect portable toilet for a campsite, on a boat, or for long road trips.
It can be a good outdoor toilet for swimming areas so that people will not track water through your home, or for large properties.
This portable toilet is fully flushable, since when you activate the pump a stream of fresh water is released from the reservoir to rinse clean the bowl.
While this toilet does require the use of water and will not compost waste, it is a good affordable solution to a true composting toilet, since it allows you to collect and conveniently transport waste for composting elsewhere.
Best Composting Toilet For Your Money
The Villa 9210 is a great option for you if you have some access to electricity, and don’t want to spend too much on a composting toilet.
This toilet can accept power from a battery, a solar source, or use the included AC adapter with standard AC power.
The fan works great to clear air out of small spaces so there is no odor.
You can divert urine to a grey water system or a holding tank, and solid waste is contained in a compostable liner bag until you are ready to empty it into your composter.
The best option for a fully composting toilet, despite the price tag, remains the Excel toilet made by Sun Mar.