Join Date: Jun 2006
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Another factor is the location of the boat (can you self pump offshore easily?) and the number of pump-out facilities in your locale.
If I were within three miles of legal "over the side" disposal, and also had the opportunity to pump-out at a marina or club, I would have at best a ten-gallon tank. My old boat, a Viking 33 very similar to a Ranger 33, has instead a 30 gallon tank under the V-berth that is way too big.
My newer boat has a 40 gallon tank plus a Henderson pump and a Lavac. This equals bigger flushes than the older boat's ITT/Brydon head, and thus ironically we pump out at the dock more often. But the newer boat is also plumbed so that we can pump out the tank overboard, or pump out the head overboard, or turn the damn head pump into an auxiliary manual bilge pump!
So at least there's that. Smaller is better if your situation can stand it. Who wants to haul around gallons of crap anyway?