When I put in my Hurricane hot water heating system, I routed the hose through some pretty dark and damp areas. I came up with the idea of repurposing old baseboard finned tubes. I put various lengths in several areas to dry and circulate the air. I plumbed them all in the return line, so I consider it free heat, especially when underway. There's a 24" section under the forward berth. I didn't use any fans but use just convection to rotate the air. I found plenty of sources for used, free fin tube.
I just cut the tube about 6" longer than needed and carefully slid off about 3" of fin plates from each end. I made a clean cut with a tubing cutter, brightened up the ends and soldered on a standard brass sweat fitting. I chose 3/4", female NPT and then screwed in a barb fitting. It worked great. Especially in the forward closet.
I hope some owners can make use of this tip.
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