I have a liquid cooled workstation with well over a gallon of water in it at any time. I've never ruined any parts, but I have had leaks when first building it.

I have a liquid cooled workstation with well over a gallon of water in it at any time. I've never ruined any parts, but I have had leaks when first building it. I quickly resolved them. There's obviously a risk in using liquid cooling all the time, but as a practical matter you'll mostly be fine if you watch highly rated videos on YouTube that walk through proper construction. Make sure you use reputable companies for the components (tubing, fittings). Make sure the fittings and tubing match in ID/OD. Use distilled water with a biocide such as silver coil in the reservoir. Also, make sure you fill the entire rig with paper towels before you turn the pump on, particularly under each fitting. Watch it for a few minutes to make sure no obvious leak is happening. Then let the pump run through the night and check to make sure the towels aren't wet. I was paranoid when I first built mine but I don't even think about it anymore. You'll want to clean out and refill the whole thing every six - 12 months.