Join Date: Mar 2006
Location: New England
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There are a couple of ways you can do this.
1) Connect the output of the head to the holding tank, and then put a diverter valve in the pumpout line on the holding tank with one side going up to the deck pumpout fitting, and the other going to the macerator pump and the through-hull.
This setup doesn't allow you to pump the head directly overboard, but it does allow you to empty the holding tank overboard, when out past the three-mile limit, and still allows you to use a shore-based pumpout facility
2) Connect the output of the head to a diverter valve, which has one side running to the macerator pump and the through-hull, and the other goes to the holding tank.
This allows you to dump the head overboard when out past the three-mile limit, and allows you to use the holding tank when inside the three-mile limit. However, this requires you to use a pumpout facility to empty the holding tank.
You can also have a more complicated setup, where the head can go either into a holding tank or overboard, and then have the holding tank pumpout fitting go either overboard or to the deck fitting, but that is far more complex and requires more hose and more diverter valves, and doesn't really gain you anything over the first setup. Yes, with the first setup to dump the head overboard you have to pump twice... but the first setup minimizes the hoses and equipment needed and maximizes your effective options.
BTW, the first setup is what I changed my boat over to, when it was originally setup as the second setup. The only difference is that I went with a manual diaphragm pump, rather than an electric macerator, since I wanted to minimize electrical usage on my boat.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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