Quote:
Originally posted by Gooserider
Hmmm.... I've been getting a different message  electronic Flow meters seem a bit hard to come by, and folks say they add alot of resistance (unless one uses the big bucks magnetic jobs). OTOH any flow restriction or stopping is going to produce a temperature rise. While I agree that a flow sensor would EVENTUALLY detect a leak, it might not do so until most of the water was pumped out of the system. Water detectors are easy and cheap, and presumably would give a very early warning, potentially while the flow sensor is still happily measuring the rate at which the pump is dumping all the water out of the system! 
Gooserider
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You really can't do anything about the HSF/WB popping off the CPU: just keep it bolted. That's a design requirement.
Some flow
meters add a lot of resistance, but flow
sensors usually don't, if properly selected. I can't believe that you didn't find the one that was presented recently.
BTW, you're off your rocker about the restriction adding heat: while the heat will appear at the restriction, removing the restriction will only cause the heat to appear at another restriction(s) within the loop
Just forget about the heat thing.
The flow sensor will protect your CPU, even if there is little flow: that's all you need. When there's no flow, then the CPU will eventually, over a certain period of time, overheat and die.
The level sensor is a good idea, as long as none of the coolant is evaporating. Even better is the Conformal coating, and an allowance for the leaked water to exit the case. The real problem, is figuring out the possible leak points.