Yeah. I'd stay away from #5, until you got the rest of it up and running.
#5 is going to require water temp in, and water temp out. I'm still figuring out ways to measure that secondary heat loss. My latest thought is to run a water block within a vacuum, and comparing the performance in normal atmosphere; aside from radiated heat, the comparison should indicate the actual difference. (inspired by another member here). Testing under those conditions though isn't obvious.
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