I did this once, not to sterilize the water but because I forgot to turn off my pelts (pump was also running), so yes it was an accident.
The system consisted of a water block that was solder together, two 220w pelts, a HW lab Rad, an Eheim pump, AMD board and a 18V 30amp power supply to power it all.
Anyway to cut a long story short, the block got so hot that the block fell apart, the water was boiling hot and CPU socket melted.
The causalities were the water block, Pelts and the CPU socket. Everything else kept working even the pump, Although I don’t know if the plastic impeller would have survived if the water had not leaked out when the water block fell apart.
:shrug: