V2 heat exchanger looks 100 times better than V1. Well done!
If this one doesn't transfer enough heat for you as-is, you can improve on it the way it is.
You can either paint it or solder it. If you paint it, use cold galvanize paint:it's loaded with zinc. If you solder it, use the tinning flux. Both methods fill in the gap between the coil and pipe and dramatically increase heat transfer efficiency. If it still isn't good enough, it never will be.
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