The thermal switch could be substituted for the flow switch, or even added to my solution switching the "pulse gen" so enabling a soft shutdown. The flow switch is just that, a simple and reliable switch type operated by coolant flow, any form of switching could be added or used exclusively. I've also got a liquid switch that I'm going to put in the res, but I'll probably just connect this as a separate alarm function only using the system fan header and a pulse gen.
I guess in most systems the temp switch on the block would be just fine. I prefer a primary solution that starts to take action as soon as the flow has stopped for whatever reason, rather than waiting for a secondary, changeable reaction like overheating. This is even more important if High power TEC's are to be used, and to be honest an instant, "pull the power plug to everything" is the best way for that, considering a High watt TEC can start to unsolder a waterblock fairly quickly if the coolant flow stops!.
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