I will be doing a ranch home shortly. It will have geothermal heating. The first floor will be radiant heat in the floor. I am concerned about the watertemp from geo. The whole house will have wither hardwood or tile. I am confident warmboard will work at geo temps, but what about gypcrete? Will gyp output same btu/sqft at approx the same temp as warmboard? Thks.......

The question is; What output do you need?

Floor covering dictate output required, design water temperature, controls etc.etc. No one can answer the question without knowing what the resistance from above will be.