Electric heater
The electric heater is powered by the car's traction battery. It is used to heat the battery and for heating the passenger compartment during preconditioning.
If the charge level in the traction battery is too low, the heater will switch off.
Heat pump
The heat pump works primarily as a range extender. In low temperatures, the heat pump helps to heat up the passenger compartment while using less energy compared to the electric heater, which extends the battery's power availability. The heat pump operates during both preconditioning and driving. It also helps to maintain the traction battery at its desired operating temperature.