There are plenty of composting toilets on the market. To help you decide which one is best for you, we’re reviewing the most popular choices. This way you can compare and pick the best composting toilet to fit your needs.
Why Use a Composting Toilet?
Composting toilets are great for off-grid applications, whether that is in an off-grid home, cabin, hunting camp, RV, or boat. The benefit for stationary off-grid applications is that they don’t require plumbing or a septic system.
When it comes to mobile applications, you don’t have to worry about finding a dump station or pump-out. Boats have been using composting toilets for years with great success, and now they are starting to catch on with RVers.
For RVing, a composting toilet will extend your boondocking capabilities in more ways than one. To learn more, check out What’s So Great About RV Composting Toilets?
Composting Toilet Basics
The concept behind a composting toilet is simple: the liquids and the solids are separated to prevent odor and facilitate composting. The liquids are diverted and captured in an easily emptied container or larger holding tank. The solid waste falls into a bucket of organic material that starts decomposing the waste. Often, an agitator is used to turn the compost in the bucket, and a fan is used to keep the compost dry and smell-free.
The Best Composting Toilets
No matter what your application is, these toilets offer an environmentally-friendly, water-saving waste management solution for your off-grid needs. Let’s take a look at the 5 best composting toilets on the market:
Nature’s Head is a great option for an RV composting toilet. This toilet costs around $925. The package includes everything you need to get set up. It has a full-size seat and a translucent liquid tank, so you can see when you need to empty it. The Nature’s Head composting toilet also separates solids and liquids to prevent odor.
It comes with a higher capacity than some other toilets on the market, with a urine container of 2.2 gallons and the solids container able to hold 60-80 uses, per their website. You only need to empty solids every 4-6 weeks if you have 2 people using it full time. Although it has a higher capacity, it saves on space by using a unique spider handle agitator design. This agitator also works bi-directionally to help speed up composting.
The Airhead RV composting toilet comes with a slightly higher price tag at just over $1000. It is made of high-quality material with stainless steel hardware. You must empty the liquid tank every 1-2 days and the solids tank every 2-4 weeks on average with 2 full-time users.
The Airhead also includes the option to have the solid crank installed on either side. This makes it an ideal choice for small spaces where one side is preferred. Something that sets it apart from other RV composting toilets is the seal around the lid of the bowl. This seal helps prevent odors from escaping the bowl and forces air to be drawn through a dedicated vent. It is also quite small, making it perfect for a smaller boat or RV bathroom.
Unlike the Nature’s Head composting toilet, the Air Head does not require the bowl to be lifted to remove the liquid bucket. Simply unscrew the fasteners and tip the bucket out from under the funnel. One downside to the Air Head design is the transparent level indicator is a small circle, so the level can be difficult to read.
This is the toilet we installed in our RV.
The Separett composting toilet comes with a price tag of just under $1000 for the popular Villa model. It is waterless and separates liquids and solids like the previous two models. However, these toilets are a lot different from the previous composting toilets in their appearance. They look much more like a traditional toilet, but they take up quite a bit more space than other toilet models.
Unlike the previous models, it does not have a liquid waste tank. Rather, liquids are diverted via a flexible drain tube to a holding tank. Given this option to divert to the grey water tank of your RV (which may require some engineering during installation), you wouldn’t have the hassle of having to empty a urine tank every day.
The solid tank is also different in that it is designed to have a compostable bag installed prior to use, and no organic material is added. All you need to do is tie up the bag and put in a new one. No churning is required and the toilet does not have a crank.
This toilet has adaptors for both AC and DC power usage to run the fans. A family using it full-time should be able to go for about 3 weeks.
The C-Head composting toilet comes in several models ranging in price from approximately $700-800. The C-Head toilet also has several customization options to make it suitable for a variety of spaces, including a V-shape specifically for boats.
You can get a churning or non-churning system. There are also ready-to-go urine-diverting funnels or DIY options for tight spaces. You can even opt for a woodgrain finish in several colors or a traditional white toilet.
Of all the composting toilets, the C-Head seems to be the most difficult to find good information on and does not provide a user guide like the prior mentions.
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The last option for a great RV composting toilet is the Sun-Mar GTG. This toilet, like the others, has solid and liquid separation into two separate tanks. These tanks are both concealed in the toilet’s outer shell for a sleek look. It includes a small fan to vent odors but does not have a crank to churn the solids.
This toilet is compact, portable, and is the smallest composting toilet available on the market. But with that small size comes a potentially shorter time between emptying of the tanks.
The Sun-mar GTG comes with the lowest price tag of our top 5 at just over $600.
Choosing the Best Composting Toilet For You
Choosing the right composting toilet will largely depend on the space you have available to install it. Be sure to look at the user guides and installation instructions prior to purchase to make sure the toilet will fit in your RV. Also consider what side the crank will be on as it will need to be easily reached, if applicable.
We hope you find a toilet that suits your needs from this list of the 5 best composting toilets on the market. They are functional, simple to use, and will greatly extend your boondocking capabilities!
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