Hi BlueLagoon,
It's not moot, since I have not had time to do the installation. I bought the Isotherm 2501, and will install it as soon as possible. I am doing other projects at the moment, new shaft, cutlass bearing, replacing the plastic through hulls below the water line, new sea strainer, new pressure water system and hot water tank. I read about the Raritan 300 what 12 volt and will scrap my other idea in favor of this one. Hot shower's on the hook, who ever thought such a thing was possible. I have 2 100 watt solar panels to install. I like the idea of installing a few new house batteries under the v-birth, that tank had been removed by the prior owner due to issues. It's all good. It keeps me out of trouble.
Have a great day and I really appreciate everyone's input, though, I am still not settled on how to better insulate the Ice Box.
All the best.
1978 323, Atomic 4.