4 Operation8 Operating instructions ecoTEC exclusive 0020193967_014.8 Switching on the product5021▶ Press the on/off button (1).◁ The "Basic display" (→ Page 7) (2) appears on thedisplay.4.9 Setting the language1. Press and hold and at the same time.2. Also briefly press .3. Press and hold and until the display shows thelanguage setting.4. Select the required language by pressing or .5. Confirm by pressing .6. Once you have set the correct language, pressagain to confirm this.4.10 Setting the domestic hot water temperatureDanger!Risk of death from legionella.Legionella multiply at temperatures below60 °C.▶ Have a competent person inform youabout the measures that should be takento protect against Legionella in your in-stallation.▶ Do not set any water temperatures below60 °C without consulting the competentperson first.1. Press ( ).◁ The set domestic hot water temperature flashes inthe display.Conditions: No control connected▶ Change the domestic hot water temperature by pressingor .▶ Confirm by pressing .Conditions: Controller connected▶ Use to set the maximum possible domestic hot watertemperature on the product.▶ Confirm by pressing .▶ Set the required domestic hot water temperature on thecontrol (→ Control operating instructions).4.11 Switching Comfort mode on and offApplicability: Product with integrated hot water generationNoteComfort mode immediately supplies hot water atthe required temperature, without you having towait for the water to heat up.1. Press ( ).2. Press ( ).◁ Comfort on or Comfort off are shown flashing inthe display.3. Activate or deactivate Comfort mode by pressing orrespectively.4. Press to confirm this change.◁ When you have activated Comfort mode, the " "symbol appears on the basic display. When youhave deactivated Comfort mode, the " " symbolgoes out on the basic display.4.12 Setting the heating flow temperature1. Press ( ).◁ The target value of the heating flow temperatureappears on the display.NoteThe competent person may have adjustedthe maximum possible temperature.Conditions: No controller connected▶ Use or to set the required heating flow temperat-ure.▶ Confirm by pressing .Conditions: Controller connected▶ Set the maximum possible heating flow temperature onthe product.▶ Confirm by pressing .▶ Set the required heating flow temperature on the control-ler (→ Controller operating instructions).4.13 Switching Green iQ mode on and offNoteGreen iQ mode is an energy-saving operatingmode. If this mode is activated, the product oper-ates in the heating and cylinder charging mode insuch a way that the maximum benefits associatedwith condensing technology are achieved.1. Press and at the same time.◁ The menu is called up.2. Navigate to the Green iQ menu item and press .