[Long Haired Git]

In the end, the Peltier is an active-heatspreader.
In this case, its also being used to heat the water so that the radiator works more effectively as it will with a large difference between the coolant temperature and ambient air. Then, with the radiator reducing the temperature of the water, the passive-pump kicks in and we get flow.
BTW, you say above 150W for the heatsink, but in the OC article, you state 5v @ 10AMP = 50W for the TEC, which would mean the CPU is probably like 40W????

I'd really like to know, to a couple of decimal places, the inlet and outlet temps either side of the radiator. Yes, I know, not going to happen. From this and the watts going in, though, you can calculate the flow rate.

I love heatpipes - so very clever and powerful and maintenance free and quiet. The solution of using an array of heatpipes is clever. The issue of heatpipes on CPUs was always the size of the contact area for the evaporator, which the "active heat spreader" neatly solves.

What you ideally want is something the size and shape of a 120.2 heatercore, but instead of several parallel rectangular brass tubes carrying a liquid coolant, you want a series of heatpipes coming out of the copper block bolted to the hot side of the peltier.

Which then gets complicated due to the fixed nature of heatpipes (unless they make flexible ones now) and the sizes being discussed.