I installed a composting head
on trailerable trimaran
I owned for a while. I knew I might sail it on the Great Lakes
where obviously dumping is inappropriate and being a small tri, both the space and weight of a holding tank
were problematic. After a short cruise
, I could simply let it finish composing while not in use and then dump it in my home compost bin after composing was complete. It worked well for that use.
For longer term, ocean use however, (where overboard holding tank
dumping is legal
and ethical) I have not liked a composting head nearly as much. It's more expensive, and will likely fill up and need emptying before all the composting is finished. I personally much prefer simply opening a seacock to dispose of waste than to lug up half composted waste and throw it overboard
I think there are many variables to consider however: Are you able to allow partly composted waste to finish composting for a few weeks prior to disposal? Will you likely be located in places where you can dispose of composted and partly composted waste? Will your live aboard lifestyle allow you to dump a holding tank every couple weeks? Is pump
out convenient? How often will it get used? Will your live aboard lifestyle including using marina facilities much of the time? With out considering such questions, I don't think one can really say what system is best.