Evacuated tube? Like the heat pipes on you CPU? Sure, but completely unnecessary unless you want to get rid of the pump [1]. And why get rid of the pump to subs

Evacuated tube? Like the heat pipes on you CPU? Sure, but completely unnecessary unless you want to get rid of the pump [1]. And why get rid of the pump to substitute it with an evacuated tube? [1] which you don't even need if you route the system well or use valves.