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Why not a box with Pex tubing running through it and salt brine sealed in the box with an expansion/overflow chamber?
Salt holds heat pretty well... My limited experience with waxes... not so much.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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