I think SecondWind is on the right track, depending on where you are. The most likely issue is that the water you are floating in is too cold - less than about 40F will result in no heat. The next most likely thing is growth in the heat exchanger and cooling water lines, requiring an acid wash. A refrigerant leak is possible but less likely than the others if the original installation was decent.
sail fast and eat well, dave
beware "cut and paste" sailors.
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