Heat Outputs
The heat output on an underfloor heating system is determined by the difference in floor to air temperature; the greater the difference between the two, the greater the output. When the pipe work is installed in a screed floor it is possible to achieve a maximum output of 100W/m². This is based on a floor surface temperature of 29°C and an air temperature of 20°C (as stated within BS EN 1264).
In a new build which is insulated to comply with Part L of the Building Regulations, the heat requirement is likely to be around 40-50W/m². In a poorly insulated building, or an area where there is an unusually high amount of glazing, such as a conservatory, additional heating may be required during mid winter conditions.
There are a range of factors that will influence the output of the system; the pipe diameter used, the distance between the pipes, the temperature of the water flowing around the system, the temperature drop across the pipe circuits, the floor make up and the floor coverings.
