Peggie,I just purchased a 1985 O'Day 26 and as the broker said, the head is not her best feature. It appears functional but if I choose to replace it with an electric head, do you recommend the Raritan SeaEra? We will use the boat in freshwater and an occasional saltwater trip.This boat has a little Yanmar diesel, standard 15 gal fresh water tank, two batteries, and will usually be charged with a solar charging system. Should I use sea water or freshwater and what do you recommend for this size boat?