The Heatrae Sadia control knob sits on one of the spindles located on the front of the control panel and allows to manually control certain aspects of the appliance's functionality. Some boilers allow to change the temperature, and some even allow you to change the current function. This means the user can have the boiler produce hot water without the central heating being turned on and vice versa.
It comes with bezel
Technical specification
TypeControl KnobManufacturer Model No95605092Brand NameHeatrae Sadia