Recharge operation

Hi people, drive now since 09/21 a 22er V90 T6 Recharge. Until now I could not read the function yet. I am interested e.g. when I start electric, drive on the highway, power out, then the burner jumps on… From the beginning the heater runs with. Does the burner warm up already or does the burner jump cold? On hybrid that would be massively cold starts. With the old start-stop systems, the engine only went out when it was warm. If I drive purely electric, then the heater always runs with or? Only then can I explain the extreme smell if I drive purely electric. So completely I did not understand the functioning of the plug-in hybrid. the consumption is at least at the same level as the predecessor V90CC without Recharge. Many greetings Robert