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yeah i dont think they are even making a mag-24 any more.
i have heard a good rule of thumb regarding return pumps for a display tank is 3-5 times the tanks volume. my tank is 180g, so use a mag-9.5 which 5.2 times the tank volume before head loss. i use a mag-7 to pump water into my fuge b/c i like the have more water movement to circulate throughout the live rock and macro algae. the fuge is 55g with a corner overflow, but the return is sprayed through a 1/2 pvc tube with many holes pointing in different directions (including towards the surface for aggitation). i am also running a mag-18 for my skimmer. i dont really see that these pumps are producing all that much heat to be honest with you. but as far as electrity wise, this is probably not a very efficent method.
I run a Sequence 3200 & use all 4 holes in my overflows as drains
& i also feed a fuge with the same pump & just in case i it was to much
flow i had it T back to the sump but never had to open it.
this pump is great the only sound i hear is the vivration because
I dint use any pads under the pump but it's in the garage so i dont worry about it