Heating a passive building
In a passive house it is not necessary to install radiators under windows. In general, the heat distribution through the air supply is sufficient. However, to continue to meet the Passive House criteria, the heating load must not exceed 10 W/m².
The heat provided by internal gains (human heat, cooking, domestic appliances) and solar energy must compensate for heat losses through transmission, infiltration and ventilation.
As long as the criteria of the Passive standard are met, the choice of heating system is free.
If the heat recovery is not sufficient to heat the dwelling (very cold days), it is possible to add a small heating source connected to the ventilation system. This can be supplied by a heat pump, a boiler or a compact unit.