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Sun-Mar Mobile Composting Toilet

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  • No pump-outs!

    Recycling Brings Freedom. The original composting toilet for Mobile and Marine applications, no muss and no fuss, no changing containers, no pouring out urine. Self-contained and with a little maintenance works like a charm!

    The Sun-Mar Mobile was the first composting toilet specifically designed to recycle waste on boats and recreational vehicles. Less pump-outs! No more chemical toilets! Recycling brings freedom, with the ODOR-FREE operation of a Sun-Mar.

     The Design of the Sun-Mar Mobile

    Although the Sun-Mar Mobile uses Sun-Mar's tried and true three-chamber system, "marinizing" the unit led to some interesting adaptations. The need to be able to handle violent motion meant that the finishing drawer had to be gasketed so that no liquid could escape from the evaporating chamber.

    The air intakes face the same problem. These have to be located higher up and the air ducted down to the evaporating chamber.

    At the same time, a special drum locker ensures that the composting drum is held upright under all sea or road conditions.

    Space constraints mean that a fold-away foot rest is needed on the unit. This footrest has spring loaded legs, and a safety release mechanism to enable it to be removed periodically when access to the finishing drawer is required.

    To assist installation, strong mounting brackets are mounted at the base and rear of the unit.

    Electrically, the Sun-Mar Mobile units are quite different from other units because of the unique situation on many boats and RV's. A 4.0 Watt 12 Volt fan is installed in a fan box within the vent stack. This fan, (which is on its own circuit) is designed to operate continuously while the unit is in use.

    To assist the 12 Volt fan in providing adequate venting, the Sun-Mar Mobile is unique among Sun-Mar units in having a 3" vent stack. Customers need to supply their own deck vents, which should be constructed to allow adequate air movement while preventing seawater from entering the unit.

    Carbon and Zeolite Filter

    While venting is optimal above deck level, some installations will require that the deck vent is flush with the deck. Sun-Mar has incorporated the use of activated carbon and zeolite filter materials in the fan box to "scrub" the air of fresh ammonia odors. This has proven successful, and ensure odor-free operation at deck level.

    Evaporation and Electrical Configuration

    Evaporation is aided by a 110 volt, 120 Watt heater and thermostat. This heater is located in the sealed base compartment.

    The thinking in designing a 110 volt heater into the unit was that a 12 Volt supply is often available while the unit is in motion, while the 110 volt heater can frequently be used while the vehicle is in an RV park, or, in the case of a vessel, hooked up to shore supply.There should be enough 12 Volt battery power to keep the 12 Volt 4.0 Watt fan running continuously, and it hooks up on a separate circuit to facilitate this.

    Overflow Drain Required

    Evaporation capacity on Sun-Mar Mobile units is limited by the size of the heater, the surface area of the evaporation chamber, and the volume of air movement. Consequently, arrangements should be made to connect the Sun-Mar Mobile drains to a container or small holding tank for disposal in an approved manner.

    Full Time and Part Time User Capacities

    Still need more information?

    Still not sure what system is right for you?

    Read our composting toilet FAQs. 


  • OffGridAndGreen is a veteran family-run business that cares about each and every one of our customers. We are dedicated to making sure your shopping experience is a positive one each and every time. We also happen to be the world's largest online distributor of eco-friendly toilets. NO ONE knows toilets like we do.

    Price - No one can beat us on price. We’ve negotiated with all our suppliers to have the lowest price available for YOU. And, if you happen to find a lower price elsewhere, we guarantee a price match with our Best Price Guarantee. You will never need to shop around for a better value for your composting and incinerating toilets anywhere else, guaranteed.

    Quality - We understand how important waste management can be in your everyday life. We hand-picked all our manufacturers to ensure that you get a quality item. All items are inspected before leaving our warehouses so we know that you’ll be happy with the product that arrives at your door.

    Service - Every customer is a part of our growing family. When you order from us, we have an open line of communication with you - we tell you when your package is getting ready for shipment, we message you when it’s being shipped and we even send you the tracking code so you know when it’ll arrive at your door. We respond to all e-mail inquiries within 12 hours because we care about you. We also have a team of technical experts that can help you with your questions.

    Safe & Secure Shopping - Our online site provides the best online experience for buying composting and incinerating toilets. Our online ordering system is safe and secure to protect your privacy every step of the way.

    If you have any questions, shoot us an e-mail at and we'll get back to you right away. Happy Shopping!

  • Order Confirmation:

    All orders will be confirmed via e-mail directly after you place your order. The confirmation means that we have received your order in our system and have pre-authorized your credit card for the purchase. After we receive your order we will automatically reach out to our warehouses to confirm that the product(s) are in stock and available for immediate shipment. If your product by chance is on back order or unavailable we will void the pre-authorization and contact to you via e-mail.  If your item(s) are available for immediate shipment (within 14 business days) we will process the charges and submit the order to the destination.

    Order Shipment:

    If your ordered product(s) are in stock, and we process final charges to your credit card, it will ship within fourteen business days from the date of your order.  Once the product(s) have left our warehouse, we will send tracking information to the e-mail you provide.  If you do not receive tracking information from us within fifteen business days of your order, feel free to follow up with us at


    Please carefully inspect the packaging and the contents of your delivery when they arrive, if you notice damage to your shipment, please make note of it when signing for delivery.  If your item(s) do arrived damaged, please send photos to and we will process an insurance claim on your behalf.

    Cancellations & Refunds:

    All orders cancelled after 48 hours are subject to a $20 administration fee.  If you order has shipped, it will be the responsibility of the buyer to return the product. Off Grid and Green will not be accountable for any shipping charges on returned items. 

    Off Grid and Green will accept returns on any order within 30 days of the original purchase so long as the product has not been used and can be returned in the original packaging.

    All returned orders will be charged a 15% restocking fee. Upon receiving and inspecting the returned product, Off Grid and Green will issue a refund for the full amount minus restocking/administration fees to the credit card used for the purchase only.

  • Off Grid and Green works very hard to ensure we deliver the best prices on the internet.  If you find another internet retailer offering lower prices,  within 6 months of your purchase, please let us know and we will refund the difference to your original payment.  We want you to feel absolutely sure that you are getting the best possible price for the products on this site. 

    To request a partial refund, simply contact us with a link to the product on our competitors site within 6 months from the date of purchase and we will process your credit accordingly.

    Our Price Guarantee has some limitations:

    • You must purchase the item from Off Grid and Green before applying for our Price Match Guarantee
    • Special promotions, like rebates and buy-one get-one-free offers are do not apply.
    • The product must be in stock on the competitors site
    • The competitor must be an online only store, and they may not have a physical retail location
    • The site cannot be a discounter or auction site (ie; Hayneedle, eBay, Wayfair, Overstock, etc..)
    • The competitor must be an Authorized Retailer for the product in question
    • The Price Match Guarantee includes the product price and the shipping cost, it excludes sales tax