James, I notice no one is helping you get that damn shower installed!
A ''real'' system has a lot of pieces, most of them add-ons for a smaller boat...so I''m wondering if you might not want to consider a simplier system (Sun Shower or pressurized container into which you pour the hot water)?
A few tips after helping a friend install his new system:
1. Fawcetts (and other retailers) offers a small 3 gal. stainless hot water heater (either AC or engine/AC heated)
2. Try to see if you can use a ''package'' shower sump (the WM catalog has several) as it simplifies the collection and
pump out logisitcs. The problem in using these in smaller boats is that there''s usually not much space under the spot where you''re showering, so you may need to snake a
line from the shower grate on which you stand to the sump. (Don''t be tempted to drain the shower into the bilge. Ugh. Becomes a 7th Grade Science Fair project...)
3. A thru-hull isn''t necessary if you can ''T'' into a wash basin drain
line. You''ll need a shut-off valve or perhaps an anti-siphon valve in that discharge
line, tho''.
4. You''ll need a pressure system to deliver the shower water; if you don''t have one, it can get quite complicated all by itself.
Like I was saying, how about a simplier system? <g>
Jack