These are built solid with metal enclosures, fan cooled, UL certified PSU, ~7k CPUbenchmark.net. Usually i5 6thGen Intel CPU, 8GB-16GB RAM and have REAL storage(SSD) and M.2 NVMe. If you are lucky you might find vPro version with remote management.
Currently running a HP G2 bought on Offerup for $70 with i5-6600T, 16GB RAM, 256GB SSD running Ubuntu server with HomeAssistant VM and few containers. It idles at 7w, with <2% CPU for my work load.
I tried Raspberry Pi with HomeAssistant with it's piss poor antique storage solution, it idled at 5W, it went straight back to store.