Dan- Just responding to Don's comment about the "limitation" of using the hot water source when in salt water, and having some C-Brat style fun in doing so! Actually, the idea presented wouldn't cost a great deal, probably under $50, and maybe a lot less if you keep a "boat and home builders/experimenters supply" of fabricating materials like I do, to build things out of.
I save all kinds of usable stuff from which to make things without making a trip down to the local hardware store to see how little they have from which to build things. One of the things I miss the most about living in Redding instead of the S.F. Bay Area, is the lack of electronic and industrial surplus stores from which to shop and acquire useful fabrication goodies.
I'll bet you folks in Alaska intuitively understand and practice this "supply side" part the process of to keeping one's home, boat, car, motorhome, snowmobile, and whatever else repaired and working. Joe.