Looking at the specs, the 8150 provides double the amount of channels (8 vs. 4) with double the power per channel (150W vs. 75W) with just double the amount of heat dissipation (375BTU vs. 173.5BTU).
However, the 8150 heat dissipation in idle is relatively high with 250BTU (typical for Class D amps), but it won?t run much hotter in operation.
Heat dissipation in reality depends on the efficiency of the speakers you connect and the SPL you want to run them at.
I'm replacing a couple C2N-AMP-4x100s with an 8150.? Never used one before.? How much heat do they put off?? I am in a position to reduce a 26 space rack to...well...one space...and I'm kind of giddy about it.