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
Why Our Toilets are Perfect for Boats
Say goodbye to pump-outs, plumbing headaches, and the constant battle with odors. 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.
Cuddy: Composting Convenience for Boats
Our best choice for most boaters. Cuddy separates liquids and solids, mixing solids with a carbon-rich medium to keep things dry and odor-free. While the composting process starts inside Cuddy, you’ll transfer solids to a compost pile or dispose of them responsibly later.
- Built-in liquids indicator light
- 12-volt 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
- Rechargeable
- Sealed odor control
- Lowest maintenance
- Great for shared boats (most hygienic)
→ Learn more about separating sealing toilets.
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 a substrate layering method instead of an agitator or sealing mechanism. It’s lightweight, requires no external power, and has no odor.
- Non-electric
- Easy to move and store
- Budget-friendly off-grid option
Boat Toilet Lineup
Cuddy
S1 Dry Flush
Cuddy Lite
Type
Self-contained composting-style(agitator)
Separating sealing
Composting-style (layering method)
External Power Needed
12-volt power supply for fan
Rechargeable with any 12-volt power system
None
Composting Capability
Kickstarts composting – solids can be transferred to compost pile or bagged and disposed of
None – bags and seals solid waste
Kickstarts composting – solids can be transferred to compost pile or bagged and disposed of
Odor Control
Excellent – separation + fan + optional external venting
Excellent – separation + fully sealed bags for solids
Column 3 Text
Emptying Frequency
Solids: every 2–3 weeks Liquids: 2–3 days
Solids: sealed after each use Liquids: 2–3 days
Solids: every 1–2 weeks Liquids: 2–3 days
Best For
Long-term liveaboard or cruising boats
Short trips or those wanting no handling of waste
Small boats, budget-friendly setups, short-term use
Cuddy
Type
Self-contained composting-style(agitator)
External Power Needed
12-volt power supply for fan
Composting Capability
Kickstarts composting – solids can be transferred to compost pile or bagged and disposed of
Odor Control
Excellent – separation + fan + optional external venting
Emptying Frequency
Solids: every 2–3 weeks Liquids: 2–3 days
Best For
Long-term liveaboard or cruising boats
S1 Dry Flush
Type
Separating sealing
External Power Needed
Rechargeable with any 12-volt power system
Composting Capability
None – bags and seals solid waste
Odor Control
Excellent – separation + fully sealed bags for solids
Emptying Frequency
Solids: sealed after each use Liquids: 2–3 days
Best For
Short trips or those wanting no handling of waste
Cuddy Lite
Type
Composting-style (layering method)
External Power Needed
None
Composting Capability
Kickstarts composting – solids can be transferred to compost pile or bagged and disposed of
Odor Control
Column 3 Text
Emptying Frequency
Solids: every 1–2 weeks Liquids: 2–3 days
Best For
Small boats, budget-friendly setups, short-term use
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 minimizes maintenance, eliminates odors, and just works better all the way around."
– Jeff, Sailboat Owner
Boat Toilet FAQs
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Traditional marine toilets often develop unpleasant odors 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.
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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.
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Liquids can be emptied responsibly every 2–3 days, while solids are emptied every 1–3 weeks depending on your model. Solids can be composted on land or disposed of per local regulations.
→ Learn about how and where to empty a composting toilet.
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Yes! The S1 separates liquids from solids and seals each #2 into a bag, making it odor-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.
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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.
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For best results, use a fine, carbon-rich medium like coco coir or peat moss to keep solids dry and help control odor.
→ Learn more about the best compost medium to use with boat toilets.
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For most liveaboards, Cuddy is the best balance of convenience, odor control, and composting capability. The S1 is best for zero-handling needs, and Cuddy Lite is great for simple setups.
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.