An electric motor is drastically more efficient than an internal combustion engine and so produces much less heat, but it's more difficult to get the heat out o

An electric motor is drastically more efficient than an internal combustion engine and so produces much less heat, but it's more difficult to get the heat out of the motor. You don't need a big radiator with lots of airflow to cool an electric motor, but you do need an intelligently designed heat exchanger in the motor unit.