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