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"ALL energy is converted to heat", wrong. a pump moves water by converting somewhere around 20% (varies greatly) of the electrical energy into fluid momentum, the rest creates heat.
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This has already been addressed, so lets let it go and continue the discussion.
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Sirpent brings up a good point:
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In a typical system, this heated air goes through the radiator. Thus deltaT between air and water is lowered and some cooling efficiency is lost. I do not think there is a noticeable difference between in-line and submerged arrangements in term of overall cooling efficiency.
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If a good deal of the heat transfered to air eventually does pass through the radiator in most systems, it further bolster the theory that much if not most pump heat enters the coolant.
Skulemate:
I'm hesitant to accept real world data here, its very difficult to determine how much is actually entering the coolant and how much is being bleed off as we measure. Not to mention your setup was atypical for most people.
However your results suggust that even with truely enormous pumps (BTW what pump is that?) the influence on coolant temps is pretty minor. Another argument for maxing flow?
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I'm really just guessing here, but I would think that both the walls of the tubing and the water would absorb some of the heat caused by friction, but whichever medium can absorb heat faster will absorb more???
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Tube and coolant will be almost the exact same temp. Unless its copper which will (as you pointed out) function as a sort of radiator. So I don't think it really matters which absorbs the heat, both are heated to the same temp.
If you meant which will have more heat, easily the water because of its high specific heat and much larger volume.