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Salt water contains microorganisms that die when caught in the head intake for extended periods of time, thus contributing to "head aroma", especially on the first flush. Boats used mostly on weekends suffer from this more than liveaboards, obviously, so plumbing the head to a fresh water source can yield a real benefit.
The pumps on manual model heads usually have a plunger that serves double duty - one side evacuates the waste, the other side draws in the flush water. It is inadvisable to connect a pump like that to a potable water system. The electric heads use one pump to evacuate waste, usually a macerator, and let the potable water system's pressure supply the flush water. Thus the two sides of the system have no direct conenction, thus maintaining the sanitary condition of the potable water.
FWIW - We installed an electric, fresh wtare plumbed head this Spring and it has definitely had the desired effect of reducing head odor. IRMV