Dometic 400 Series Marine Toilet, Bone, 18 in Seat, Pedal Flush

The Dometic 400 Series is a full-size, permanent-mount toilet built for the head on your boat, and it works just as well in an RV or a cabin. This is the bone-colored model with a round seat, and it sits at a comfortable 18-inch seat height. If you've been living with a cramped, low portable unit, stepping up to a fixed toilet like this one changes the whole feel of the head.

Dometic has been building onboard sanitation systems since 1960, and the 400 Series is their bread-and-butter permanent toilet. It flushes with a foot pedal, so both your hands stay free and there's nothing extra cluttering the deck around the base. Press the pedal and a triple-jet bowl rinse washes the bowl down from three points, which keeps things clean without you standing there working a hand lever. That triple-jet rinse is the detail people notice first after an upgrade.

The seat and lid are soft-close, which sounds like a small thing until you're anchored out and someone uses the head at 3 AM without waking the whole boat. No slamming. On a boat that's underway, a soft-close lid also just stays put instead of banging with the chop. The round bowl and 18-inch seat height feel like a household toilet, which is exactly what you want when you're spending real time aboard.

Installation runs off a 2-bolt mounting system. That's a genuine plus when it comes time to service or winterize, because pulling a 2-bolt toilet is a lot quicker than fighting a 4-bolt base. One thing to plan for: boat and RV floors are rarely dead flat. If you're setting this on cored or curved fiberglass, take the time to build up a level, solid base or backing plate before you torque the bolts down. Snug it evenly so the gasket seats right and you won't chase a weep at the base later.

The footprint is compact at 19-3/4 inches high by 15-1/4 inches wide by 17-3/4 inches deep. Measure your head before you buy. The 18-inch seat height is comfortable and fits most sailboats and mid-size cruisers, but if you've got a tight, low-headroom powerboat head, check that you've got the vertical room to sit comfortably. This model ships without a hand sprayer, so the install stays clean and simple. If you want a sprayer, you'd plumb one in separately.

A word on upkeep, because salt air is hard on everything. The pedal linkage is the one moving part that appreciates attention. A quick shot of silicone spray on the pivot every month or so keeps the pedal action smooth through the seasons. Beyond that, the plastic bowl wipes clean and the bone color hides everyday use well. Keep it rinsed, keep the pedal lubed, and this toilet will serve quietly for years.

Day to day, the 400 Series is built to be simple. There's no complicated electronics to fail, just a mechanical pedal and a clean bowl rinse. That reliability matters when you're a hundred miles offshore or parked somewhere remote and the nearest parts counter is a long way off. Simple gear that keeps working is worth a lot out there.

Who's this for? Cruisers and liveaboards who want a real, comfortable head instead of a portable. Sailboat owners doing a refit. RV and cabin owners who want marine-grade sanitation gear that's built to hold up. If that's you, the Dometic 400 Series is a straightforward, proven choice. Bring your measurements and a photo of your current setup if you can. Between the footprint, the seat height, and your plumbing runs, we can tell you in a few minutes whether the 400 Series drops right in or whether you'll need to plan a small modification. We'd rather get you the right toilet the first time.