Denon has an Eco mode which I would bet compares to Pioneer''s usage. Honestly I chuckle at those who think they are saving that much $ by buying a receiver based on electricity consumption - no offense. The Denons I have owned run as cool as the Pioneer they replaced, and the Denon 5200 (and 4200) has two more channels to operate plus it does video processing, something the old Elites didn't do (that will in of itself will generate a little heat).
As someone who had and enjoyed a Pioneer SC-07 for a number of years, the Denon is worth it for the better room correction system. If you were looking at the Pioneer flagship then I might feel differently in regards to sound. Finally, before you buy give JD a call for pricing. Smartest choice you could make since its always good to save a little $.
There is no perfect display, quit looking for faults and enjoy
LG OLED 65” B7 and 55” C8
Ascend's with RAAL, Love my PSA v1800 and a 7.2.4 speaker config, Oppo 203 and other stuff