Does Pass Aleph 3 heat up the room like tube amp?

No comparison I am afraid. I loved the Aleph 3, but the Viva outperforms it in every area, except electricity consumption. Better control of the speakers, more transparent, better base, more neutral. Mind you it should be better, it is more than twice the price, although it does include an active Pre of course

I changed from an Aleph 3 to a 22watt SET, now that is hot. The Aleph 3 you can put your hand on for 10-15 seconds, the SET less. The SET in practice produces far more heat, it is useable, with some discomfort, in the Summer. I never kept either on all the time. The SET of course you would'nt and I agree with Truman, the Aleph 3,warms up to a good performance, quickly.

I absolutely do'nt want to reopen arguments about world resources, but personally, I find it difficult to waste electricity, sourced from fossil fuels, leaving a class A amp on all the time. Other people think differently I know, that's up to them