Sun-Mar Composting Toilet: A detailed review

Flushing the Competition with The Sun-Mar Composting Toilet and Reviews

Sun-mar composting toilet

Sun mar is a world leader in providing eco-friendly toilet solutions.

Their toilets provide an environmentally friendly and stylish alternative to traditional toilets and costly septic system installations.

Sun mar is ideal for someone wanting a top-of-the-range composter with the reassurance of a top name brand.

In this article, we will go into detail on the top 3 sun mar toilet models, their features and specs, material, and possibly some tips on using the composter.

Why Sun Mar?

Sun Mar has a patent for the most efficient composting method, all while having a long-standing history of creating and producing composting toilets. This is why many people consider it to be one of the best composting toilets, and how you know you are getting a worthwhile and unique product when buying a Sun mar composter toilet.

This article is intended to give you all the information and advice you need in order to make an informed decision for your home, cabin, or any place of residence.

You should be able to determine whether these top 3 models will fit your needs or whether you need to look at and evaluate some other Sun Mar toilet models.

Best Overall
Model 1: Sun-Mar Excel self-contained composting system
9.5/10Our Score

The Excel is Sun Mar's best selling unit in North America. It's a high-capacity Bio-drum toilet that's easy to use, has tried-and-true technology, and is highly dependable. The Excel was the first self-contained toilet to get National Sanitation Foundation certification (NSF). As a result, when you buy an Excel, you're getting a composting toilet that sets the bar.

 The Excel has adequate capacity to be utilized in a variety of settings, including homes, cottages, and even light commercial applications.


  • Available in 2 colours- white and bone
  • 2″ Thin-wall PVC Vent pipe
  • Capacity of 3 adults or a family of 5 for residential use
  • Capacity of 6 adults or family of 8 for seasonal or vacation use

Uses 3 composting chamber toilet system to turn waste into compost -

1- chamber where fresh water is deposited
2 - evaporation chamber, creating compost through air and heat movement.
3 - finishing drawer, compost is moved to this final chamber and sealed away to avoid contamination with other chambers.

Best High Volume
Model 2: Sun-Mar composting toilet central system- centrex 3000
9.2/10Our Score

For very heavy cottage or medium household use, the Centrex 3000 NE has a continuous flow design.

Rotation of the drum carries compost along the bigger and longer 3000 series drum before it drops automatically into the collecting container at the end of the unit in a continuous flow system. The drum will not have to be rotated rearward for emptying under typical working circumstances. This arrangement can accommodate more than one toilet.

This model sells out fairly regularly.


  • Composting capacity of 5 adults/family of 7 for residential use
  • Composting capacity of 8 of 10 for seasonal or vacation use
  • 4″ Thin-wall PVC vent pipe

Top Tips:

  • This device must be used in conjunction with the Ultra low flush toilet, which must be purchased separately.
  • The AC/DC kit, which can be purchased separately, may be used to convert this system to an AC/DC system.
Best Portable
Model 3: Sun Mar GTG Urine Diverting composting toilet
9.1/10Our Score

The GTG is Sun-Mar’s smallest and most economical toilet. The GTG further extends Sun-Mar’s innovation, leadership and bold designs. The toilet sets up in minutes and its design, modern styling and ultra-compact size make it a perfect solution for any place a toilet is needed.

It is ideal for Homes, Tiny Homes, Cottages and Cabins, Boats, Rvs and any other place you can think of– the list is endless and the GTG can go anywhere where it’s not possible or cost-effective to install a conventional toilet.



  • Low set up time
  • Uses two chambers that separate solids and liquid waste
  • Low maintenance solution for any toilet requirement
  • For use where a conventional toilet is not an option or not cost effective
  • Elongated toilet seat for extra comfort
  • Unlimited capacity

Top Tips:

  • Ideal to take to places where a conventional toilet can't be easily installed
  • One of the most cost effective options for an eco-friendly toilet

Which is the best?

Whether or not these top 3 Sun Mar products are ideal and correct for you, depends entirely on what you’re searching for and the specifications you require for your place of residency. In order to do this, there are some considerations to make:


  • Can you use toilet paper with the products?
  • Are the manual and instructions clear?
  • Does it solve a problem you’re having at your place of residence?
  • Does it produce odor?
  • Does it require a sewage or septic system?
  • Does it provide the cost and savings you seek?
  • Is it high capacity enough for your family size?


Many people are highly apprehensive and hesitant when it comes to switching from the traditional flush toilets to composting toilets- largely down to the fear of the toilet producing a bad odor!

One thing you can be sure of when switching to a composting toilet is that there are many options and products on the market that work just as well, if not better than conventional toilets, all while keeping the bad odor at bay! Just like the Sun-Mar models mentioned in this article.

If you still feel unsure about whether or not this is right for you, why not check out our article on Separett Villa composting toilet models, or alternatively you can look into another great compost toilet – the Airhead.