Maintenance for the sanitation system will be reduced to disposal and cleaning. Under the current system, we have to pump-out the tank (disposal), cleaning the toilet, lubricate the internal workings of the toilet, and check to hoses on a regular basis.
The composting toilet will eliminate the need for 2 seacocks. Seacocks are holes in the hull. Seacocks can either be intake (which allow water in) or outtake (which allow water to go out). But don't let the designation fool you, all holes allow water in. The foremost concern of any boat owner is unwanted water coming into the boat. The more seacocks you have the more opportunities unwanted water has to get inside.
Weight on a boat is another concern of any boat owner. You can have too much weight and it can lead to the boat sinking. By removing the current sanitation system, we calculated that we would be eliminating approximately 150lbs or more of potential weight in favor of a system that will weigh approximately 35lbs at the heaviest. This gives us the ability to store another 115lbs of supplies.
Again the composting toilet is a no brainier. The only reason, I can think of, that boat builders don't install composting toilets on their boats to begin with is because of the cost. A composting toilet can run anywhere from $800 to $2,000. But I believe it will be worth every penny!