Water Underfloor Heating Information
Below are guidelines on how to design your UFH installation.
Before you commence your installation take time to design your pipe layout to use the maximum
amount of pipe but be careful to make an allowance for the location of the control unit. Set the
pipework in 100mm from all walls/edges.
As the temperature of the UFH system is controlled by the Blending Valve in the Control Unit,
reducing the pipe centres does not increase the room temperature but does reduce the heat up time.
Use the chart below along with the area of your room to determine the optimum pipe spacing. The
spacing is described as c/c; this is the distance between the centreline of the pipes.
Room Size Coil c/c Blending ValveTemperature
25 m2 100 m 300 mm 48
20 m2 100 m 200 mm 45
15 m2 100 m 150 mm 44
If the room is smaller than 15m2 it is still recommended to use as much pipe as possible. But,
normally c/c 150mm is the minimum spacing.
We recommend setting the water temperature at 45°C for screeded floors, which can be increased to
48°C if larger pipe centres are used to achieve a maximum floor temperature of 29°C.
If a timber floor finish or floating floor is proposed set the Blending Valve to achieve a maximum floor
temperature of 27°C to avoid shrinkage of the timber boards.
