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Was just looking at the owner's manual for the 9 to 17 foot boats.

They say -

All Boston Whaler boats are self bailing. The 9, 11, 13, 15, and 17-foot models will accumulate some water if all drains are left open. The amount of water will depend on the weight distribution and engine size. Once stabilized, additional water from rain or wash down will actually exit the boat through the open drain tubes because of the hull's buoyancy. The water level will not exceed the height of fuel tanks or battery boxes. This feature allows the boat to be left unattended on a mooring or slip without the need for bailing or bilge pumps. An optional bilge pump is offered on 17-foot models as a convenience for dewatering. Water is quickly "run out" of the boat through open drain tubes once underway. Drain plugs can then be installed to keep the boat dry.

I didn't know that...