Freeze protection for hydronic pole barn heating

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My father built a pole barn with in-floor hydronic heating. We are just now getting around to adding the heat source (7kw Electro industries Off-peak boiler).

He is located in Minneapolis MN so the 99% design temperature is -9.4°F.

We are looking to use a Cryo-tek 100 anti-freeze mixture.
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In relation to the design temperature, which protection rating should we be targeting? Both category and temperature?

Thanks
 
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