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home composters Sun-Mar Rotating Garden Composter

Sun-Mar Continuous Composters

Sun-Mar 200
$350 + $100 shipping

Sun-Mar 400
$449 + $175 shipping for most customers. Please see shipping note below.


Due to the popularity of these items, delivery takes about a week from time of order.


Don't forget the option of adding Coco Fiber composting medium!

Click here for more details.

Pack Size

Kick Start Your Compost

Compost Swift

Compost Swift Compost Additive

Compost Swift is a mixture of aerobic bacteria and enzymes, specifically formulated to speed the activity of aerobic bacteria in any backyard composter.

+ free shipping if purchased with a Sun-Mar composter

add compost swift to cart


Compost Magic

Compost Magic

Compost Magic dramatically speeds up composting in a Sun-Mar composter. Compsot Magic is 100% natural bulking material.

+ $15 shipping for Six Compost Magic Bricks.

add compost magic to cart


New for Summer 2013 : Sun-Mar Composters - Easy, Batch Free Composting

Study Proves: Compost Helps Fight Off Plant Diseases!

"A study commissioned by the Waste & Resources Action Plan (WRAP) looked at recent research into almost 50 types of disease affecting plants and concludes the evidence that compost made from garden or food waste helps suppress all manner of wilts, rots and turf disease is overwhelming." Read more...

Sunmar Pages ::

- Compare the 3 Models
- Inside Sunmar 200
- Inside Sunmar 400
- Sunmar Manual


Why use a Drum Composter?

More Oxygen, Better Mixing, Faster Decomposition
Rotating the drum allows an abundance of rich oxygen to mix with the organic material. Aerobic, oxygen-loving bacteria that decompose green waste need fresh air to make compost--so the more air they get, the better your compost becomes. Mixing material in a drum also allows the proper amount of moisture, oxygen, and heat to build up throughout the entire pile, and not just one small section.

No Batches means Continuous Use
One of the problems with older types of drum garden composters was the need to finish a current batch before adding new material. In a Sun-Mar, material moves continuously through the unit. No need to wait.

Rotating Encourages A Hot Pile
In a Sun-Mar unit, the material does not cool down too much--even when you rotate it. You let the composter sit days before turning, and the heat builds up again within hours of a rotation.


Our Composter Line ::

We reviewed over 20 composters before choosing our composter line. What sets these composters apart is their ease of use and faster composting times. However we go one step further in choosing durable and easy to assemble systems that will be hard working garden tools for years (arduous assembly knocked out quite a few).

With the addition of the popular Green Cone Composting System, we now carry a line of 4 top quality composters including the Sunmar Continuous Composter Line, the Tumbleweed Composter, and the educational RolyPig Composter.

solar composter
green cone composter

The Green Cone System:

  • The install and forget it composter!
  • Empty it once a year or so.
  • No turning, maintenance, or distribution.
  • 90% of composted material is absorbed right into the ground. Clever hey.
  • Handles kitchen waste from an average family of 4. Even meat and bones.

tumbleweed composter
  • Our only batch-style composter, one that we felt was heads above all the other tumble type composters (and easy to assemble....some others took hours!)
  • Produces compost in 1/4 the time of traditional methods.
  • Just a spin a day.
  • Pest-free, sturdy, meets our testing standards!



Acknowledged Composting Technology Leader for 30 Years...

Sun-Mar, the acknowledged leader in composting toilets now brings their expertise to the garden. Sun-Mar knows the best way to compost is by using a rotating drum. They've been using a rotating Bio-Drum™ in their landmark toilets for over 25 years. sunmar composterThe new Sun-Mar garden composters take this concept a step further by adding a patented double-drum to the design. Compost materials go in the top and finished compost exits automatically out the end as the drum rotates. No more digging, forking, poking, lifting, or other "work" that previously went with composting! Easy to turn, easy to compost, and even easy to assemble.

Sun-Mar products are carefully inspected and packaged to assure they reach your organization or customer in their original manufactured condition. Where requested Sun-Mar contracts third party transportation carriers for product shipments on behalf of dealers and customers. Any product damage or loss occurring in transit is the responsibility of the transportation carrier and not Sun-Mar. Therefore it is imperative that all products be fully inspected prior to accepting delivery from the transportation carrier and prior to signing a proof of delivery/freight waybill.

In the event of an inspection determining product damage or loss it must be reported immediately either on the proof of delivery/freight waybill at the time of delivery, or the delivery should be refused with a note that delivery was refused due to damage. Once the proof of delivery/freight waybill has been signed by the person receiving the products it confirms that the merchandise was received free of damage and removes liability from the carrier. Any subsequent attempt to claim for loss or damage will not be accepted by the carrier. In the event a claim is required it must be filed directly with the transportation company, however, Sun-Mar will assist in this claim process if shipping was originally contracted by it and the preceding procedures adhered to.

Patented AutoFlow© Biodrum: the Breakthrough Idea

  • Easy to feed : Material goes in through easy-access top ports.
  • Back-saving ball bearings mean easy turning.
  • Patented, double drum, Autoflow® design. See diagrams of the inside
  • Compost exits automatically as the drum rotates :
    Fresh compost comes out the bottom port, automatically, when done. Tool free, shovel free, fork free!
  • Easy to load and rotate.
  • Pest Proof
  • Assembly in minutes (really!): Just snap the cradle on to the drum bearings and you’re ready to go

Compare our Composters

Sunmar Composter Mower Info

Tips for Using your Sun-Mar Composter

  • Not many tips actually since it's as easy as 1,2,3. (fill, rotate, remove)
  • Rotate the drum regularly
  • Add moisture to the drum if the contents get dry
  • Keep the composter warm (the sun usually does the job)
  • For the richest result, mix kitchen waste, yard waste, and brown waste (sawdust, dry leaves, straw)

Composting Can...

  • Reduce the amount of garbage you send to the landfill each year. Think of all of the kitchen scraps you've tossed, or weeds you've pulled. All of this material can become compost--and can stay OUT of the garbage dump!
  • Save money on your water bill. Compost helps the soil retain water more efficiently, so you spend less watering plants.
  • You'll have free, organic fertilizer--forever! No more bags of filler and chemicals.


  • Sunmar Composters come with a 1 year warranty.

Shipping Info ::

  • Shipping within the Continental United States is $100 for the Sunmar 200 and $175 for the Sunmar 400.
  • Please email us for rates outside the continental United States and Canada.

Return Policy


Sun-Mar Rotating Garden Composter Models : 3 sizes to choose from

Sun-Mar 200 Sun-Mar 400
sunmar composter sunmar composter
hobby gardener with kitchen scraps and general yard waste serious gardener with kitchen waste and garden trimmings
Compact size is perfect for any yard Mid-sized
16" high output port 18" high output port
50 gallon (6 bushel) size 100 gallon (11 bushel)
31" high x 33 11/42" long. 36" high x 42" long.
Depth: 24" Depth: 28"
38lbs 60lbs
1 feed port 1 feed port
1 output port 1 output port
optional rollers optional rollers
sunmar composter
How the inside works
sunmar composter
How the inside
easy & quick assembly (snap together) easy & quick assembly (snap together)
Estimated Assembly Time:
5 - 10 minutes
Estimated Assembly Time:
10 - 15 minutes
Shipped in one box Shipped in two boxes
SunMar's Warranty:
Fiberglass body: 25 years
Other Parts: 3 years
SunMar's Warranty:
Fiberglass body: 25 years
Other Parts: 3 years
Price: $350.00
Shipping: $100.00
Price: $449.00
Shipping: $175.00 to most locations

Sun-Mar 400 shipping note:

Most of our customers are covered by our shipping charge.

However, additional shipping fees for the Sun-Mar 400 may be necessary if a customer lives in a remote area because the trucking company will have to interline the shipment with another trucking company in that area.

Additional shipping fees for the Sun-Mar 400 will also be charged if there are a lot of tolls charged for entering a city i.e. New York City

Additional shipping fees for the Sun-Mar 400 will be charged for some customers on the west coast.

We will email you when we are ready to ship to inform you of additional charges. Most of our customers are not affected.