Running water cooling AIO 24/7/365?

[eccerr0r]

Does anyone here run an AIO or other liquid cooled CPU cooling solution 24/7/365 / on a server? Do you feel comfortable with possible failures? Should I be worried about pump failures? Pump failures causing leaks?

Having reservations on a second hand cooling system on a PC. So far it's pretty good, keeps things nice and cool but I've never had long term experience with 24/7/365 operation of water cooling, AIO or not. Might have to downgrade to an air cooled system for peace of mind?

[stj]

they dont leak,
the failure modes are pump dying and liquid slowly being replaced by air causing air-traps.

the liquid thing takes several years,
the pump failure is no different to a fan failure, the pump output's a tacho signal to the motherboard.
so the system will detect the failure and shutdown.