The ocean might give off Helium 3 out of the mantle via mid-oceanic ridges, maybe 3 Kg. a year, but there is NO such thing as "Helium 3 heat" so the short answer to your first question is: zero.

Helium 3 does not spontaneously undergo fusion on Earth and therefore produces zero joules and, so far, requires more joules in that you get out, so it's a negative number. Hydrogen is not helium.
Source(s):
http://en.wikipedia.org/wiki/Helium-3


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