The product brief says maximum 30W and it looks like the whole enclosure is a heatsink, even has ribs on the back. The expected operating temp is 50C but it's probably rated to operate at higher than that.

P.S. I had to shuck 20TB WD drives that cost 350EUR on sale (now at 400EUR). 26TB drives are now ~700EUR. These external drives were the cheap option. Standalone drives usually cost more.