In the low heat hydronic radiant system I will be using in my new construction project the more I learn about low temp heating the more I think my plan to use heated storage water is not compatible. It is easy to see heating water to 85-90 degrees needed and circulating it thru the floor as needed would work fine. But to use water to store excess available heat via higher water temp is seeming to be less possible for low temp system. Feeding high temp water directly might over heat floor(unless only small volume is feed thru at a time). Added water with a mixing valve couldn't be done if there is no where for the extra water to exit system. And I don't know if a HX can be operated to a specific temp one side and variable on the other.
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