I’ve seen radiant hot water flooring using hot water heaters controlled in series, using closed loop glycol. Then in summer you switch over to a chiller pump. Same storage and distribution tanks, but cooling versus heating function. It works really well.
Condensation on the floor isn’t a problem? When things are cold, you get condensation, especially in the humid south.
I’ve actually seen this happen just on a regular floor, not one that’s being intentionally cooled.
There’s all kinds of radiant schemes out there. In this environment water heaters don’t provide enough fire power. plus if they were electric no one could afford to run them. 43 cents p/kwhr winter rates.