Which to choose depends on whether you want to stay with a manual toilet or switch to macerating electric. The Fresh Head is the ONLY manual toilet designed to use pressurized fresh water, so the only only one that can safely be connected to the fresh water system..the intake line teed into the fresh water line to the head sink cold water supply line (and a discharge line, of course). There is no intake pump, just a lever that works like a faucet to allow flush water to flow.
All macerating electric toilets need their own separate dedicated circuit, shared by nothing else--not even cabin lights--that can pull power away from it...low voltage will damage the motor. So you'd not only have wiring to run, but at least a 15v amperage draw with each flush. An electric solenoid valve in the cold water line to the head sink replaces the intake pump.
Hope this helps with your decision.
--Peggie
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