Sun-Mar Sun-Mar Centrex 2000 Composting Toilet System
Sun-Mar Centrex 2000 Composting Toilet System
Sun-Mar Sun-Mar Centrex 2000 Composting Toilet System
Sun-Mar Centrex 2000 Dimensions
Sun-Mar Centrex 2000 Dimensions

Sun-Mar Centrex 2000 Composting Toilet System

Sun-Mar Centrex 2000 Composting Toilet System

Regular price $2,414.00
  • FREE Shipping and No Tax (It's On Us!)
  • Ships in 7 - 10 Days
  • 30 Day Hassle-Free Returns
  • 30 Day Price Match Guarantee
  • In stock, ready to ship
  • Backordered, shipping soon

Sun-Mar Centrex 2000 Central Composting Toilet System

The Centrex 2000 Central Composting Toilet System is a step up from the centrex 1000 in every way. It provides longer composting cycles, larger waste storage volume, and the ability to use as a wet or dry system! The Centrex 2000 is designed for medium to heavy seasonal or light residential use.

Sun-Mar Centrex 2000 Dimensions

  • Height & Depth: 28" x 27"
  • Width & Crank Clearance: 45.5" x 49"
  • Weight: 97lbs
  • Depth required for Drawer Removal: 45"

When used seasonally by up to 7 adults, compost will normally only need removing annually each spring. In residential use compost will have to be extracted more frequently.

When used full time by up to 4 adults, some compost will need to be emptied into the finishing drawer once every few months.

Centrex central composting systems offer all the benefits of modern waste composting systems while keeping the look and feel of a more traditional bathroom.

Sun-Mar Centrex 2000 Compatible Toilets for (WET) system

  • Model 510 Plus
  • Model AM Style II

Sun-Mar Centrex 2000 Compatible Toilets for (DRY) system

  • AF Waterless Dry Toilet
  • AF Waterless Elongated Dry Toilet

The Centrex 2000 system is able to support as many toilets as you like. The limitation is how many people use the toilets.

Full Time and Part Time User Capacities

    Sun-Mar Centrex 2000 Electrical Specs

    • Max Amps: 3.6
    • Fan Watts: 35
    • Heater Watts: 370
    • Avg Power Usage in Watts: 200


    What's Included in Sun-Mar Centrex 2000 

    • Centrex 2000 Unit 
    • Owner's Manual
    • Warranty Card
    • Rake
    • 2" ABS Vent Pipe 30"L (Qty:6)
    • 4" Diffusor
    • Hardware Kit
    • 1" Flexible Drain Hose (8' Long)
    • Compost Sure Blue (2 Bag)
    • Not included**: 3" plumbing pipe and fittings needed to connect a 1 pint flush toilet to a central composting unit.

    Sun-Mar Centrex 2000 Optional Upgrades 

    • Toilet AF Waterless or AF Elongated Waterless 
    • Toilet AF Waterless or AF Elongated Waterless & Compost Sure Green (Case of 5)
    • Toilet Model 510 or AM Style II
    • Toilet Model 510 or AM Style II & Compost Sure Blue (Case of 5)

    Sun-Mar Centrex 2000 User and Installation Manual

    Want To Learn More About Compost Toilets?

    Be sure to check out our book! Just released, The Ultimate Composting Toilet Guide - Everything You Need to Know About Composting Toilets.

    The Ultimate Composting Toilet Guide

    Watch The Sun-Mar Video! 


    Free Shipping Promotion:

    Shipping costs for our business are typically around $10 for accessories can range and up to $450 for larger items.  However, for a limited time only, we are offering free shipping on all products to the lower 48 states in the U.S.. No minimum order required!

    If you would like an order shipped to anywhere else in the world, please email us at, and we will gladly work something out with you! reserves the right to cancel this offer at anytime

    Order Confirmation:

    After you place your order, you will receive a confirmation email.  This means that we have received your order in our system.  As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and ready for shipment.  If your item happens to be on backorder, or is otherwise unavailable, we will let you know via email.  Once your item(s) are available for immediate shipment, we will ship the order.

    Order Shipment:

    Your order will ship within the lead time we have posted on the product page.  We will email you tracking information within 24 hours of your order leaving the warehouse.  If you do not receive tracking information from us by 3 days after the lead time posed on the product page has elapsed, feel free to follow up with us at

    Most orders will be shipped by FedEx or UPS. Small items may be delivered by the US Postal Service or by the US Postal Service via FedEx Smartpost or UPS Surepost. Larger items may be delivered via FedEx Ground, FedEx Home Delivery, UPS Ground, or Truck Freight. Items shipping via Truck Freight are clearly marked on our website and catalog. Some special orders may require 2 to 6 weeks depending on the item.

    Some large or heavy items require additional shipping and handling charges due to the bulky nature of these products. If an item requires additional shipping and handling charges we will clearly mark this requirement on our website and in our catalog. In most cases, we charge a "flat" rate to ship these items.

    Free shipping applies to orders totaling over $99 shipped to a final destination within the contiguous 48 states of the United States. Certain items do not qualify for free shipping regardless of order total. Items that do not qualify for free shipping will be clearly marked on our website. reserves the right to cancel this offer at anytime. Delivery to rural or extended areas, special order, & Truck Freight shipments may take extra days to arrive. Please call (888) 467-5447 for details.

    International Orders:

    International Orders (except Canada) require special processing. When you are entering an International Order, please complete all the necessary information. We will get a shipping quote from one of our International shippers. We will contact you with the final charges for approval. The order will not be shipped or charged unless it is confirmed by you. Please note: You will be responsible for any applicable taxes and/or duties that will need to be paid upon delivery.

    Canadian Orders: We do not ship directly to Canada, however, we will ship to a US-based freight forwarder of your choice! We recommend you first contact the desired freight forwarder to obtain their shipping and receiving processes. You will be responsible for all duties and tariffs on Canadian shipments, along with coordinating with the freight forwarder for delivery to final destination. Please call (888) 467-5447 for assistance, otherwise enter the shipping address provided by your US-based freight forwarder.


    ALL SHIPMENT SHOULD BE INSPECTED AT THE TIME OF DELIVERY. DAMAGED PACKAGES SHOULD BE REFUSED. If you notice any damage, you should note it on the freight bill when signing for delivery.  If your product is defective or sustains damage during shipping, please contact us at right away. Remember to keep all the original packaging for any items that need to be returned. All returns need to be authorized by our customer service department prior to being processed.

    If delivered by Truck Freight, please contact the freight carrier at the phone number on the carrier’s bill. After contacting the carrier, please call Customer Service at (888) 467-5447 for further assistance with the damaged shipment. Please note, signing for your delivery without noting any damages or inability to inspect the delivery on the relevant paperwork legally states that you have received your freight in good condition and cannot be held liable for any damages, missing pieces, etc. that may be incurred as a result of this decision. Leaving a note or instructions for the driver is considered to be the same as signing for your products in good condition. If you authorize the freight company to leave freight without a signature, cannot be held liable for any damages, missing pieces, etc. that may be incurred as a result of this decision. If you choose to sign for a visibly damaged please note on the relevant paperwork that you are signing for a damaged package; however, cannot be held liable for any damages or missing pieces for accepted via signature delivery.

    Cancellations & Refunds:

    To cancel an order, reply to the confirmation email you received when you placed your order online. Just tell us why you need to cancel and we will process it as soon as we can.  All orders canceled after 48 hours are subject to a $50 administration fee, regardless of whether your order has shipped.  If you order has shipped, you will also be responsible for return shipping charges. Refunds will be issued to the credit card that you used when placing your order minus a 10% restocking fee.*

    How do I return a product?

    If you want to return an item, please send an email to

    Returns will only be accepted within 30 days** of the receipt of your product.  The product must be returned unused in the original packaging.

    We do not accept returns of used products.  You should also provide us with a receipt of your purchase and a reason for returning the item.

    Please note that you cannot return an item without a valid return authorization number.

    You (the customer) are responsible for return shipping to the address given at the time you receive your RMA. In addition, there will be a 10% restocking fee on all returned products.

    Upon receiving and inspecting the returned product, will issue a refund for the full amount (minus restocking fees) to the credit card used for the purchase only.

    Custom Orders

    Unfortunately, we are unable to accept returns for custom ordered products (made through a custom invoice) due to the nature of these specially ordered products. 

     * A 20% re-stocking fee will be applied for all Aqua2Use and Dry Flush products

    ** For all Emergency Water Well products, the item must be returned within 10 days for receiving the product. All other conditions above apply. 

    Questions & Answers

    Have a Question?

    Ask a Question
    • Can the Centrex 2000 be placed horizontally, above-ground, in a separate room from the toilet, OR must it remain underground, below the toilet?

      If you are installing a 510 low flush toilet it can be above ground but at plumbing grade from the toilet. If you are looking at the waterless options, the Centrex system must be directly below the toilet.

    • How will this hold up in the Winter months? I live in a small cabin. I was going to place it under the cabin in the back. But not sure how it will hold up with cold temps... Thank you for your reply.

      In the winter months, the composting unit has to be kept above 55F in order for the compost unit to actively compost. For limited use in cold temperatures, you can use the unit as a holding tank as long as there is enough space in the drum.

    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

    Customer Reviews

    Based on 7 reviews
    david zerbst

    Itself the product is wonderful, the boxes come large and on a 3rd party company , the crank is a little extreme, old school car without power steering. having the tank at the bottom of home instead of in the home is a really good ideal for the ones that want a normal toliet but wanna go compost. It’s outside with plumbing , not a lazy man toliet. Crank that super toliet hey !

    John Daly
    Ooo shit

    It was very easy to order which I did on September 9 it is now January and I have not received my toilet. First it was the coronavirus now it’s a snow storm. I sure hope this toilet can handle all this

    Cory C.
    it’s Gooood!

    So far, It is working good. No smell and easy to operate/maintain.

    John G.
    Toilet System installed

    Toilet is a little low to the ground is there a higher one I can purchase. Overall the system works well.

    Bill M.
    Cottage Retreat

    We are thrilled with our Centrex 2000. As our cottage is built on rock, a septic system would have been very expensive. The Sun-Mar system is much more affordable and environmentally friendly, which is important to us.

    Recently viewed