I started working as an apprentice plumber about two years ago and I wanted to see if it was possible to cool a computer using all plumbing parts. With the exception of the water blocks, every part in this build is pressure rated and certified for either potable water or closed circuit heating. The radiator is a combustion chamber salvaged from a gas fired water heater. The chassis is made from 3/4" and 1/2" nominal copper tubing, all soldered connections, and oak plywood. It's not perfect, but it's leagues better than my first attempt, and I'm sure I can build even more beautiful computers in the future.