In my 2006 Hihy new car features manual, it is a 90 m³/h airflow, equivalent to a 1 500 W heater (front is 340 m³/h, 5 500 W eq) using the engine coolant in a separate core heater driven by a 40W fan (front is 210W).

As in all Hihy, the ICE has to run most of the time in cold temperatures (in this part of Canada, we have -20°C frequently) It would otherwise drain the batteries quickly if not on coolant.