Thanks CD. Were are trying to cool our 34' Columbia. We are located in Lake Huron in the Great Lakes. We sail out of Bay City Michigan so we are not sailing in the tropics. You think the smaller 16k unit will do the job? I have a perfect place in the bottom of a hanging locker for the unit. What about the T-Hull Strainer being about mid ship. Does the Unit lose its prime during sailing? or are you just worried about it losing its prime while its operating. thanks.