Jabsco conversion is not a good choice...
It makes enough noise to wake the dead and draws a whopping 26a, compared to 16 for most other sea water electric toilets (10 for those designed to use pressurized flush water)...and costs more than complete electric toilets if you know where to shop. The ONLY advantage to it is that it fits on a manual toilet base. The only real disadvantage to an electric toilet is, all sea water electric toilets are a bit noisy...some a LOT noisier than others....'cuz contrary to what most people believe it's not the macerator and discharge pump that makes all the noise (and uses the most power), it's the intake pump. Toilets designed to use pressurized flush water, otoh, are very quiet, use about 30% less power and about half the flush water...they also cost a bit less. So even though you're in fresh water, you might want to consider going with a pressurized flush water version.The best "bang for the buck" on the market is the Raritan SeaEra http://www.raritaneng.com/products/toilets/electric/sea_era.html ...available in both sea water and pressurized flush water version...both are also available as either a complete toilet or a "conversion" (everything but the bowl). These folks http://www.boatfix.com/elec/rarseaera.asp have the pressurized flush water conversion for $358.It's VERY important that ANY electric toilet be wired correctly, and that it be on its own separate dedicated circuit shared by nothing else...'cuz low voltage to the toilet will damage the motor--and anything else on the same circuit that's on at the same time the toilet is flushed.