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The MULTIBETON system of modulation is designed to ensure that the underfloor heating system closely follows the building heat requirements. This means for instance acknowledging that a greater requirement for heat exists at external walls and glazing than on an internal wall. Consider the top half of the diagram below which shows pipes evenly spaced.
The result here would be that the temperature against the external wall would be lower and uncomfortable. The lower diagram shows that by increasing the pipe density against the external wall an even temperature profile can be achieved.