[Room Temperature Modulation]

All Buderus gas condensing boilers and control units use a unique and efficient new technology. This technology, developed by the Buderus group, is called “room temperature modulation”. This energy saving technology controls the output of the boiler according to the temperature of the air in the room, rather than measuring the flow temperature in the boiler. This means the boiler can react almost instantaneously to even the smallest temperature fluctuations, adjust its output accordingly, and maintain comfort levels in the room.
The temperature in the room will remain constant and this will result in a more comfortable climate for the user and fewer trips to the thermostat to alter the heating output. It also ensures optimal performance of the boiler as the burner is not continually turning itself on and off. Only boilers that modulate using this room temperature system will be able to achieve this level of consistency and avoid the larger temperature fluctuations that can occur using standard on/off controls.
The graphs below show the various control systems available and the resulting differences in burner output, or energy usage of the boiler.

On/off Controls Compared with Room Temperature Modulation

Modulating Boiler with On/Off Controls vs. Room Temperature Modulation