When the booster heater is positioned for heating only, flow water temp. thermistor (THW1) is not able to detect the outlet water temperature of circulation water during
DHW or legionella prevention mode. To determine more accurately if the heater is ON with DHW or legionella prevention mode, THW1 must be placed where it is able to
detect the outlet water temperature of circulation water. Therefore the recommended booster heater position is for both DHW and heating.
Although the booster heater is positioned for both DHW and heating, switching ON Dip SW 2-9 deactivates the booster heater during DHW or legionella prevention