Lab grade temperature control valve for automatic aquarium water change system?

Ok, I need to find a laboratory grade temperature control valve, that can keep water flowing through it at 80 degrees with accuracy within less than half a degree. I am building an automatic water change system, and this is the one part I cannot find. Does anyone know where I can find one? Also, it needs to be... show more Ok, I need to find a laboratory grade temperature control valve, that can keep water flowing through it at 80 degrees with accuracy within less than half a degree. I am building an automatic water change system, and this is the one part I cannot find. Does anyone know where I can find one?

Also, it needs to be capable of taking a fairly large flow, as the tank is 220 gallons.
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