1 Radiant heat temperature settings at the boiler. 2  Radiant heat temperature settings in the tubing. 3  Maximum temperature for radiant-heated floor surfaces. 4  Energy efficiencies of radiant floor heating.nder wood floors nailed right to the subfloor and tubing below, radiant heat temperatures are typically at the middle of our 85-135 Â°F. temperature range, or about 105-115 Â°F.