It is possible
I have a dhw tank of 300 litres , and the water temperature can reach at the top of the water tank 140°F ( 60°C ) , so it is possible to obtain that temperature , but it is limited on the volume of water that you have in your underfloor heating . It depends where is your house located , if the winters are not that harsh and there isn't a high humidity area when the outdoor temperatures varies between 40°F and 25°F ( it defrosts more often ) , then you should be ok .
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