Best composting toilet reviews 2018 (A Definite Buying Guide)

Our Composting Toilet Reviews will show how it works and how human waste can be transformed into a potential manure for your garden at zero cost. Remember, Not everybody uses the composting toilet but it is the best choice when it comes to manage the human solid waste.

Today, Composting Toilets for residential use are available in the market either in self-contained units or central composting systems.

Buying a Composting toilet is a wise decision because it is portable, compact, and make light work of dealing with waste management.

These toilets are expensive than the normal toilet but they are the better choice when there is water scarcity problem and waste management issue.

We have listed down the more popular dry flush toilets and self contained toilets available in the market to help our readers to choose the right one.

Comparison of Top Rated Composting Toilets 2018

Editor's Choice
Nature's Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
Nature's Head Dry Composting Toilet with Standard Crank Handle
Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE
Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel
Nature's Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
Nature's Head Dry Composting Toilet with Standard Crank Handle
Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE
Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel
148 Reviews
88 Reviews
11 Reviews
12 Reviews
22 x 20.5 x 21.7 inches
19.8 x 20.8 x 20.5 inches
36 x 36 x 28 inches
33 x 22 1/2 x 33 inches
Editor's Choice
Nature's Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
Nature's Head Self Contained Composting Toilet with Close Quarters Spider Handle Design
148 Reviews
22 x 20.5 x 21.7 inches
Nature's Head Dry Composting Toilet with Standard Crank Handle
Nature's Head Dry Composting Toilet with Standard Crank Handle
88 Reviews
19.8 x 20.8 x 20.5 inches
Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE
Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE
11 Reviews
36 x 36 x 28 inches
Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel
Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel
12 Reviews
33 x 22 1/2 x 33 inches

Nature’s Head Self Contained Composting Toilet with Close Quarters Spider Handle Design

  • Made in USA product
  • Full size elongated seat for comfortable use.
  • Disassembles in seconds for empty is easy.
  • Urine separation dry toilet
  • Withstand the harsh marine environment.
  • Vent hose included fan included.
  • Light weight portable toilet.

Nature’s Head Self Contained Composting Toilet with Close Quarters Spider Handle Design is one of the best and affordable composting toilets available in the market. The toilet has a very innovative design suitable for small living spaces. Though it is small in size, the overall comfort it provides in terms of seating and usage is excellent. It is a urine separating dry toilet and works by separating both liquid and solid waste irrespective of the location.

Compact size

It is the best portable composting toilet designed for marine use. Since it is compact, it is ideal to fit in a small space, small workshop, cabin or RV and suitable for harsh conditions, where plumbing is hard to carry out.

Molded design:

The design has the perfect match for the shape of the human body give maximum comfort to the user. Its hand crank agitator located at the base of the toilet is highly suitable to speed up the composting process. The composting works on electricity with 12 volts power. The crank handle is easy to use, and the composting is very eco-friendly and is one of the best eco toilets available for a budget price.

Waterless working

Even if you don’t have a stable water connection, this toilet works well as it follows a waterless operation. The toilet installation and connecting the vent hose to the ventilation unit is very easy. You don’t need to be a plumbing expert to do the job. The electric fan in the vent drives away the stinky smell, and hence you will have an odorless environment.  The toilet comes with a 5-meter vent hose, which also helps to neutralize the foul smell of the composting toilet.  Dismantling the waste tank is comparatively quite easy and let you clean the composting toilet within a short time.

Spider handle for composting

The solid waste removing container has a spider handle at the base side of the toilet that helps to decompose waste material. The peat moss in the waste container gets mixed with the waste products and hence composting becomes easy. Spider handle can use for mixing the moss with the waste. You can easily mount the handle on either side of the toilet.

The user-friendly self-contained composting toilet is portable and features with urine separation system. It can use any confined location, where there is no electricity or hard plumbing area, be it road or on a boat, etc. This toilet is perfect when you are on a vacation or a camp where water availability is less. The toilet also doesn’t stink and produce any foul odors. As the product developed for outdoor use, it has an extremely durable design.

  • Compact design
  • Comes with fan and vent hose
  • Portable
  • Urine diversion
  • Easy to clean seat
  • Easy to empty
  • Odorless
  • Stainless steel hardware
  • Compact spider handle
  • Short vent hose
  • Fan not powerful

Nature’s Head Dry Composting – Toilet with Standard Crank Handle

  • User friendly toilet
  • Installation is easy
  • Lightweight and odourless toilet
  • Robust construction helps to withstand harsh conditions.
  • Waterless operation allows easy to use for many applications.
  • Completely self-contained and portable.
  • Hand crank agitator in base designed for fast composting.

Nature’s Head Dry Composting Toilet with Standard Crank Handle is a dry composting toilet comes with a crank agitator in the base that can use for faster composting. It is a self-contained toilet designed for waterless operation with urine diversion. The lightweight compost toilet is completely odorless and convenient for the user.

Urine diversion

It encompasses with a unique urine diversion feature which gives much edge over other peers in the dry flush toilet segment. As both types of wastes separated easily, it can quickly compost the waste. Urine diversion separates liquid waste from solid waste effectively. It is essential for safe and efficient sanitization for your toilet. The method also works by drying out the waste for odor free working and bacteria reduction.

Durable design

The toilet comes stainless steel accessories, and it has a user-friendly design for easy use. The narrow yet long seating adds comfort every time you use the toilet.

Easy Waste disposal

The toilet comes with a container and a lid to dispose of waste material and hence is ideal to use as a best composting toilet for RV. You can buy an additional container if you wish to do composting for an extended period. You have to empty the liquid waste frequently when it gets full, which is easy to do. The tub can easily wash with hose and water. It comes with a 5-inch vent hose, a power plug of 12 v and a bottle cap.

The compact design of the compost toilet make it easy to use and works well for all types of climate. It comes with a standard crank handle which is simpler and quicker to operate. Turning it 2 or 3 times will mix the waste with the peat moss. It uses an electric fan and ventilation for better air purification.

  • Compact and lightweight
  • Urine Diversion
  • Easy emptying
  • Odorless
  • Waterless operation
  • Durable fittings
  • Easy to re-assemble.
  • No clear instructions
  • Short hose
  • Narrow seat

Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE


  • Toilet works in off grid
  • Uses no water
  • No pollution
  • Foot stool is removable one
  • Self-contained composting toilet
  • Simple and easy to Installation

The Sun-Mar Excel Non-Electric Self-Contained Composting Toilet, Model# Excel-NE is a self-contained composting toilet and is a best seller in the segment. Its large capacity makes it ideal to use for a family of 4 or 5. The dry compost toilet works fine without water and doesn’t produce any odor. The toilet doesn’t require electricity, and hence it is very convenient to use.

Compact design

The design of this toilet is very compact, yet it is suitable for a big family. Although Excel in size, it is specially made for small spaces and extensive use.

Solid and liquid waste separation

It uses 2 separate bins for storing solid and liquid waste. The toilet comes with the decomposition handle on the front side, which makes it comfortable to use in congested areas.  Further, it features with a well-functioning vent, fan and an electrical heater. It evaporates liquids in normal temperature. The toilet also comes with a small stepping stool to make it easy to use as it is pretty high.

Electricity free

The toilet works without electricity as its operation is completely non-electric. It is a very convenient waterless composting toilet for people living without any electricity access.

The toilet from Sun Microsystems has unique features for heavy use, and it is easy to install. When it comes to maintaining the toilet, adding peat moss and mixing it with the waste is quite easy with the attached handle. The sliding tray attached to the biodegradable toilet helps in quickly removing the solid waste.  Further, for easy access, it comes with a foot rest which makes things easy for the user.

  • Lightweight and compact
  • Electricity free use
  • High capacity
  • Urine diversion
  • Removable foot stool
  • Front placed agitator handles
  • Venting kit
  • Waterless operation
  • Environment friendly
  • Overflow drain placed high
  • Seating a little high
  • Narrow seat

Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel

  • Low profile toilet unit best suits for any bathrooms
  • 100% non-polluting toilet
  • Water usage is zero
  • Bio drum for processing compost
  • Detachable footrest
  • Pest proof toilet
  • High capacity use
  • Emergency drain included
  • Electricity required to this toilet model

Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel is an electric powered formal self-contained composting toilet.  The toilet is meant for high capacity usage and is suitable for light and heavy commercial applications. It features with a bio drum for easy decomposition of solid waste. The toilet is easy to process and have the latest technology. It has a certification from the National Sanitation Foundation, which is a shred of evidence to confirm its functional qualities.

Excel size

The major feature of this composting toilet is definitely its high usage capacity. A family of  3 or 4 members can conveniently use it. The storage of waste is rather easy, and it is completely odorless.

Convenient bio drum

The bio drum itself is compact and has an agitator handle to stir the solid waste of the drum. The drum can recess in the toilet body so that it saves more space than in other models.

Mixing handle and other features

The compostable toilet comes with a smart design with mixing handle positioned in the front side making it comfortable to use in small areas. It is electric powered and comes with an evaporating heater stacked in the base of the unit helps to dry both liquids and solids.  Besides all these, the unit comes with a built in fan for regularizing air circulation and keeping it odor free.

The Sun-Mar Excel Self-Contained Composting Toilet, Model# Excel comes with incredible features and perfect to use frequently for several members. It is true that some prefer the toilet to be much sturdier as it comes in plastic. However, it has an elegant design and is of compact size. It is one of the smallest composting toilets and hence is very much space saving. The toilet also comes with a drain hose, making it easy for emptying the waste bins.

  • Small design
  • Odorless
  • Waterless
  • Bio drum included
  • Electric toilet
  • 100% environment-friendly
  • Front placed agitator handle
  • Foot stool included
  • Vent included
  • Best for commercial use
  • Not sturdy
  • Foot step not durable
  • Long toilet

Buying Guide for Choosing the Best Compost Toilet

It might not be the first time you are hearing about composting toilets, but a few might be knowing how it functions. Composting toilets are an innovative form of traditional flush toilets and are more environment-friendly.

These are basically dry toilets which use aerobic technology to decompose the wastes. Most of the people prefer composting toilet over traditional in recent times, because they don’t need water to function.

When you have planned to purchase the water less composting toilets, then you will have many questions in your mind. Few of them like where you can buy one, how you must install it, and do they smell, etc. These questions are okay to think about and knowing their answers are also important to be able to purchase the composting toilet.

There are several factors you have to look for when buying a composting toilet. We have tried to include everything you need to know.

What is a composting toilet?

The composting toilet is one of the most convenient, affordable, and environment-friendly waterless method to process your toilet wastes. It is best suitable especially when you cannot connect the toilet to a sewage or septic system. Also, it is ideal for drought areas or location with non-availability of water.

Types of composting toilet

When choosing a composting toilet, you need to know about the different kinds of toilets.

We can find 2 types of composting toilets, the Self-contained and Central composting toilet systems. Self-contained units can install directly in the bathroom as a composting unit part   of the toilet.

Self-contained composting toilets are available in nonelectric and electric versions as well. They are economical, doesn’t require water, winter friendly and easy to    clean. Whereas, the central composting toilet is a 2 piece system where the compost part is kept separate from the toilet.


Yes, unlike traditional toilets, some composting toilet systems require a legal permit to install at your home. Self-contained toilets generally don’t need any legal permission.

However, in some areas, some types of toilets require approval. The legal procedures vary according to the country where you reside.

Will it stink?

Normally, a compostable toilet will not stink inside, as the toilet comes with a fan and a  vent. But, make sure the fan is of good quality, and it functions correctly.

However, there are chances for a little bit of odor since the vent leaves in your house. It is better to run the vent to the roof line instead to terminate it near to a door or a window.

Does it have urine diversion?

While planning to buy a composting toilet, it is preferable to opt for a urine diversion system, which can separate urine from the solid waste.

In this system, the urine collected at the front portion and piped to the outlet, whereas, solid waste falls into a container placed on the back side of the toilet. Urine diverting toilets doesn’t break down solid waste into compost, and the composting occurs outside.

If toilets don’t have urine diversion, it must have very powerful heaters to separate both liquid and solid wastes.

Size of the composting unit

If you are planning to buy best compost toilet for your small living space, then you need   purchase a toilet with a small composting unit.

However, such unit will not have heaters,and they have several other risks as well. Liquid accumulations, nitrification, and chances of insects getting attracted to the toilets will be some of the problems you may face.

These types of toilets require a lot of maintenance. Hence you may choose a composting toilet wisely.


Installing a cheap composting toilet is a simple process. You can find several video tutorials online which can help you do the installations. It mostly depends on the kind of composting toilet you have decided to install in your bathroom. Based on the make and size of your building, you will have to do the installation process.

In some cases, when you find that the installation is tough to handle, then it is better to have professional help. Sometimes as much as we like to do things ourselves, it is better to let the professionals do their task in a seasoned manner.

Benefits of using composting toilet

Using a composting toilet has several advantages.

  • Since it is a waterless unit, you don’t require any plumbing works. The composite toilet is easy to install, and you have only to set up the outlet stack.
  • It is quite economical when compared to traditional toilets.
  • The composite units are best suits for winter operation. You can keep the bathroom warm during the winter. When you are residing in a cold weather area, then it is extremely beneficial.
  • In general condition, you don’t need any approval. These units can evaporate all kinds of liquids during seasonal operation. As the complete waste undergo recycling, you don’t require approval for using the toilet.
  • It is simple to clean. The toilet comes with a bowl liner underneath the seat, which is easy to remove when you want to clean it.
  • The composite toilet comes with the pleasing high glossy finish. High-quality fiberglass finish is extremely attractive and clean looking.
  • It comes with a 25-year guarantee. The composting toilet will need some maintenance, so make sure to have a maintenance contract if possible.

How does a composting toilet work?

The working of a composite toilet is simple. You need to sit on it like how you would do on a traditional toilet and use it. You can make use of a set of paper rolls before using the toilet. After using, the waste will get trapped in a composite well or chamber. Based on the kind of composite toilet you have purchased the waste shall dispose of as per the system process.

You will need to replace the chamber once it is full. These are ideal for any kind of environment like a forest as well as cities. A well set composite toilet comes with a very low ecological footprint. When you replace your toilet with a compost toilet, you are saving more than 5,000 gallons of water per year.

You can find more information on the EPA about the effect of composting toilets to the environment.

How to use a composting toilet?

It can use immediately after installation. You need to check with the local laws for disposing of waste in your locality. In many countries, states, and cities, the municipalities have not updated their laws for treated human waste. If your locality does not have an update, then you will be fined for using a compost toilet.

Usually, all the compost toilets are user-friendly, and you must read the manual carefully to avoid any worst-case scenarios. Some composite toilets required to empty the chamber often and also some composite toilet need electric power to operate and run. These factors need to be taken into consideration before you buy the product.

Do composting toilets smell?

Yes, there are chances. The smell coming out of a composting toilet has always been an issue. However, if you are using the toilet in a well-ventilated room or bathroom and can maintain it correctly, there will be no chance to have a smell. The toilet accelerates decomposition leaving odorless waste material, looks similar like a commercial fertilizer.

Based on the laws of your state, you can bury the waste safely in the ground. Maybe you can also use them close to the base of non-edible plants in your garden. Keep them away from fruit and vegetable plants which you might consume.

Are Composting toilets an effective solution to waste management?

The dry flush toilet is one of the best alternatives to the traditional toilet in many ways. Like you read about the benefits of owning the compost toilet than a conventional toilet, there is no denying in it.

For many users, the bad odor was an issue, especially in compact areas. However, if you can have good ventilation and compost pit dug in your garden, then waste disposal should not worry you.

A waterless composting toilet makes you to take some responsibility for reducing the carbon footprint on the planet. You can do that by reducing the water usage in the bathroom.

In case you did not know that more than a huge pool of drinking water is simply flushing out every year just because of flush toilet use. The wastage of precious water can reduce considerably by eliminating your dependence on treatment plants.

Since natural resources are using to treat your waste, it will be eco-friendly. Similarly, toilet papers using to put the waste inside the toilet, and the paper will always be a recycled paper. It will be another advantage as it won’t damage natural resources, and not required loads of clean water for flushing like a traditional toilet.

In consideration of all these benefits, it would be beneficial for the society to move towards composting toilets instead of conventional flush toilets.