Compared to the early models of Rapid Boilers, which featured a flow switch and thus required a certain water flow rate to produce domestic hot water, manufacturers have equipped modern boilers with a new, more precise mechanism for detecting DHW demand.

The Flow Meter is, therefore, a component on the sanitary side that precisely measures the flow of water within a pipe. Malfunctions of this device can cause the boiler not to turn on during DHW extraction or to turn on when there is no demand.

The flow meter works through a sensor that detects the water flow rate using a turbine or a Hall effect meter. When water flows through the flow meter, the turbine rotates or the sensor detects the movement, sending electrical signals to the boiler's electronic board. This board interprets the signals to regulate the flame and ensure that the amount of heat produced matches the demand for domestic hot water (DHW).

In modern models, the flow meter not only increases boiler efficiency but also helps reduce energy consumption and greenhouse gas emissions. By adjusting the flame based on the actual demand for hot water, the boiler avoids wasting energy by maintaining a high flame when not needed.

It is important to keep the flow meter in good condition to ensure the proper functioning of the boiler. A faulty flow meter can cause several issues, including:

  • The boiler does not turn on when there is a demand for hot water.
  • The boiler turns on even without a demand for hot water.
  • Sudden changes in water temperature.
  • High energy consumption and system inefficiency.