You do need to be aware that incinerator toilets require a rather large (4") vent stack through the coach roof that has a catalytic converter in it that requires rather frequent cleaning
. And that the burn isn't just a 'whoosh' of heat...it runs intermittently for over an hour and still doesn't always reduce everything to ash. You might want to read the Incinolet owners manual Incinolet owners manual
Except for the power source, they all work
pretty much alike.
If your goal is just to have a self-contained system, an "MSD" portapotty is the simplest and requires -0- power. The "MSD" designation in the model name/number means it has fittings for a pumpout line and vent line, and is designed to be permanently installed (actually just sturdier brackets than portables, so you could still take it off the boat if you absolutely have to), which means that although it's still called a PORTApotty, you don't have to carry anything off the boat to empty it.
A 5-6 gallon model holds 50-60 flushes...you'd need at least a 30 gal tank to hold that many from a manual marine toilet. No plumbing needed except a vent line and pumpout hose--so no new holes in the boat...and -0- maintenance needed except for rinsing out the tank--which you can do with a bucket while it's being pumped out. Total cost including the pumpout hose and vent line is about $200--a fraction of what you'd spend for toilet, tank and all the related plumbing needed unless you want to have the ability to dump it at sea...that would only require a y-valve in the pumpout line, a macerator or manual diaphragm pump and little more hose. And the best part is, you have all the advantages of a toilet and holding tank without giving up a single square foot of storage space.
Check out the Thetford 550P MSD (recently discontinued but still available from Defender and other retailers) and the Dometic/SeaLand 975MSD Sanipottie.
A "composting" toilet--Head Airhead Toilet
or the Nature's Head Nature's Head Composting Toilets
is the only other viable choice unless you're in waters where it makes sense to install a Type I MSD (USCG certified treatment device legal
in all waters except those specfically designated NO Discharge)...check out the Raritan
ElectroScan ElectroScan promo sheet
and PuraSan Raritan PuraSan Promo Sheet
All of the above do require some power, but they all run on 12v.