I have an NC-1200 based amp here (Merrill Audio Veritas twins) it runs very hot in comparison to the Purifi on the same load. The Purfif amps with a single SMPS 1200 run barely warm, even cranking Tool at "11" for an hour on my 4 ohm speakers. Hence I had total confidence in putting my stereo build in a non-ventilated chassis. This is really a night and day difference in terms of heat in the real world. I will try and take a pic of my build later today to share with folks here.
I can be mistaken, but doesn't the Merrill Veritas have a linear power supply instead of a switching one?.