Boat toilets
The Best Boat Toilets for Life on the Water
Whether you’re cruising on a sailboat, living aboard a narrowboat, or need a portable marine solution, our boat toilets are designed to make life on the water easier, cleaner, and more sustainable.
Composting
Cuddy Composting Toilet
£870.00Meet Cuddy, the best composting toilet for your lifestyle. Perfect for long-term adventures, off-grid living, or anyone who requires a more sustainable solution with minimal maintenance.
Composting
Cuddy Lite is a no-fuss, easy-to-manage option that’s perfect for people who are looking for a straightforward composting toilet for occasional trips.
Dry flush sealing
This version of the S1 Dry Flush Sealing Toilet has no internal battery and runs straight off your rig’s power. There’s nothing to charge and nothing to remember.
Why Our Toilets are Perfect for Boats
Say goodbye to pump-outs, plumbing headaches, and the constant battle with odours. With our waterless and low-maintenance boat toilet options, you’ll spend less time dealing with your toilet and more time enjoying the open water.
Eliminate Thru-Hulls
No need for an external water source or thru-hull for flushing.
No More Pump-Outs
Avoid the hassle of finding, waiting, and paying for pump-outs.
Reduced Weight
A 15-gallon holding tank adds 124 pounds, mostly from flushing water. Our boat toilets eliminate this.
More Space
Removing holding tanks frees up valuable storage space and eliminates malodorous waste onboard.
Toilet talk
Real Boater Stories
Don’t take our word for it. Learn how (and why) one sailboat owner switched out his standard boat toilet for a Cuddy:
"Removing our old head, holding tank, macerator, and plumbing and replacing it with a Cuddy Composting Toilet was the best thing we did on the boat. It minimises maintenance, eliminates odours, and just works better all the way around."
– Jeff, Sailboat Owner
Boat Toilet Lineup
Compare Our Boat Toilets
Not sure which boat toilet is the best option for you? Here’s a quick overview and comparison of each option
Cuddy: Composting Convenience for Boats
Our best choice for most boaters. Cuddy separates liquids and solids, mixing solids with coco coir to keep things dry and odour-free. While the composting process starts inside Cuddy, you’ll transfer solids to a compost pile or dispose of them responsibly later.
- Built-in urine indicator light
- 12V fan for ventilation
- Compact, portable, and chemical-free
→ Learn more about Liz and her 3-year experience using a composting toilet for boats.
S1: Seals Solids Away
If you want zero handling of matter onboard, the S1 seals each #2 in a hygienic bag. It’s perfect for those who value convenience and don’t mind arranging regular disposal for the sealed bags.
- Touch-button operation
- Sealed odour control
- Lowest maintenance
- Great for shared boats (most hygienic)
→ Learn more about separating sealing toilets.
Prefer it wired in? The S1 12V has no battery and runs straight off your boat’s 12V system.
Cuddy Lite: Simple, Portable, and Power-Free
A great choice for smaller boats or minimal setups. Like our other boat toilets, it separates liquids and solids but uses the layering method with coco coir instead of an agitator or sealing mechanism. It’s lightweight, requires no external power, and has no odour.
- Non-electric
- Easy to move and store
- Budget-friendly off-grid option
Shop by use case
Find the toilet for
your setup
FAQ
Boat Toilet FAQs
Do boat toilets smell?
Traditional marine toilets often develop unpleasant odours due to the mix of liquids and solids in the holding tank, plus stagnant flushing water and marine plumbing buildup. Our boat toilets do not smell. We’ve avoided these issues entirely by separating urine from solids.
→ Learn more about urine diverting toilets.
Can I install a composting toilet on my boat?
Yes! Composting-style toilets work great on boats. They’re self-contained, waterless, and don’t need thru-hulls or holding tanks.
→ Learn about how composting toilets work.
How do I empty a boat toilet from CompoCloset?
Liquids can be emptied responsibly every 2–3 days, while solids every 2–3 weeks with Cuddy, every 8–12 uses with Cuddy Lite or every 1–2 uses with the S1. Solids can be composted on land or disposed of per local regulations.
→ Learn about how and where to empty a composting toilet.
Is the S1 Toilet good for boats?
Yes! The S1 separates liquids from solids and seals each #2 into a bag, making it odour-free and hands-off. You’ll need to regularly dispose of the sealed bags, which is ideal for short trips or boats with easy access to disposal.
Are CompoCloset’s boat toilets lighter than a marine holding tank?
Yes, significantly! A 15-gallon black holding tank can add about 124 lbs to your boat. Switching to a composting or sealing toilet eliminates that extra weight.
Can I use regular sawdust or kitty litter in Cuddy or Cuddy Lite?
For best results, use a fine covering medium like coco coir or peat moss to keep solids dry and help control odour.
→ Learn more about the best covering medium to use with boat toilets.
Which toilet is best for liveaboard boats?
For most liveaboards, Cuddy is the best balance of convenience, odour control, and composting capability. The S1 is best for zero-handling needs, and Cuddy Lite is great for simple setups.
Time to 💩 or get off the pot
Ready to Upgrade Your Boat’s Toilet?
Whether you want the self-sufficiency, ultimate convenience or the simplest option, we’ve got the right marine solution for you.
Still have questions? Contact us and we’ll be happy to talk toilets with you.
2-year warranty · free UK shipping on orders over £150
