Air-to-water heat pump sizing in new construction

Is the room’s location also considered in the heating load (proportion of exterior walls)?
What is the nominal output of your heat generator?

Yes, we have a complete heating load calculation for each individual room. Prior to that, the thermal insulation calculation of the house was created. We received the sizing of the heat pump from Vaillant; the Arotherm Plus 35/6 (3.6 kW) will be installed.

Do I have a thinking error there

Bathroom 9.3m2 almost the same heat output as with the hw? Although that was only calculated with 20 degrees.

Maybe internal or something?
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Nowadays? A bathroom without a window, I hardly believe it.. not that somewhere it says 300 watt additional heater..

Bathroom has 9.8 m² net exterior wall, utility room has 15.5 m² EW. Of course, both with windows. No additional heating, but different installation distances for underfloor heating, bathroom 5.5 and utility room 11 cm.

In today's times? A bathroom without a window, I hardly believe.. not that somewhere it says 300 watt auxiliary heater..

Interior bathroom does not mean that there are no windows. But there is a difference whether the bathroom has 2 exterior walls or only one.