Yeah, you're on the right track now!
But the balance point is so far up there, that you're not likely to reach it: if you ever get a pump that puts in enough heat as to make a significant impact, post a picture of it, OK?
BTW, the more "turbulent" the flow is, the easier it will be for the water to shed its heat (or pick it up). The measurement of turbulence is in Reynolds, where <2'000 is considered laminar, 2'000 to 4'000 is in the transition zone, and >4'000 is fully turbulent.
If you can run the numbers, you'll find out that no one is achieving fully turbulent flow (jet inpingement excluded).