Maxx,
perhaps there's a different way of thinking about it?
If you were outside and the air temp was at 1 deg C, and you had a bucket of water at 1 deg C too, which would feel the coldest to have your hand in? Obviously the cold water would conduct heat away from your hand much faster than the air, reducing the temp of your hand much faster.
With the brass T in your loop the water would conduct heat to the brass fitting pretty quickly, wheras the brass T would dissipate heat to the air much more slowly. Its the principle on which a radiator works. Lots of fins on the air side to give a large surface area for heat transfer, smooth passage for the water as it conducts heat to the radiator very efficiently.
In reality the temp of the brass fitting would have to be somewhere between the water temp and the internal case temp, but due to the above it would be very close to the water temp.
If brass Ts were so good at removing heat from the loop we'd have radiators made out of them.
Hope this makes sense.
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