PH,
I understand what you are saying and while I am in complete agreement with you, my point is with a rather large res ( say 30 to 40 gallons) precooled to 25C, I would think you should be able to complete the test of said block before a noticable rise in temp that the chiller cant overcome. While I doubt you could run it for a 24 hours test, I think it would keep up for a couple hours at least.
as far as the pump induced heat I agree it would need to have an adjustment to set the temp at start according to flow rate and pump induced heat.
Like I said I may be wrong, but thats what I see.
Aardil
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