I own a Pass Labs Aleph 30 (30 watts, Class A) that is exceptional. And, it’s also an exceptional space heater. On a whim I recently purchased a PS Audio Stellar S300 amplifier for the sole purpose of trying Class D amplification. After about 100 hours of use I can say that the amplifier generates little to no heat and so far I’m feeling like I gave up little from a performance perspective. Insert all of the audio descriptors here…
In addition, not that it is necessarily a priority (for you), but PS Audio has a generous trade-in program and the direct purchase process was excellent. Zero affiliation, just passing on a very positive experience.