Radiant Floor Heating Design
Tube Length = Floor Area x 12 / Tube Spacing (inches)
Loops = Total Length / Max Loop Length (round up)
GPM = BTU/hr / (500 x Delta-T)
- Typical supply temp: 100-140°F (much lower than baseboard heating)
- Max floor surface temp: 85°F for occupied areas (ASHRAE)
- Max loop length for 1/2" PEX: 300 ft to limit pressure drop
- Output: 15-40 BTU/hr/sq ft depending on spacing and water temp