Heat pump roof penetration for air nicely?

Horrido,

we are currently considering adding another room to our garage in the new building, where the building services could be accommodated. Since this will take place directly on the property boundary and a heat pump with indoor installation would fit perfectly there, questions about the air flow arise:

1. Are there distance regulations for the air flow of indoor heat pumps? For outdoor units, there are, but what about the air grilles in walls? Do they also need to have a distance from the neighbor if the airflow runs parallel to the property boundary, for example?

2. Does anyone know of any "nice" roof penetrations for this purpose? So far, I have only come across a Viessmann flat roof penetration (item no. 9565188) which looks good visually.

3. I am particularly interested in the iDM AERO SLM, which, however, looks on the (not very informative) homepage as if it necessarily has to be placed in a corner to be able to breathe on two sides. Does anyone have experience whether the air flow can possibly be extended?

Thanks :)

Are there distance regulations for the air flow of heat pumps installed indoors? For outdoor units there are, but what about the air grilles in walls? Do they also have to maintain a distance from the neighbor if the airflow, for example, runs parallel to the property boundary?

No idea, but I can’t imagine it.

2. Is anyone familiar with "nice" roof penetrations for this purpose? So far, I have only come across a Viessmann flat roof penetration (Art.-No. 9565188) that looks good aesthetically.

You don’t have to use a standard one. Have a carpenter and locksmith build something according to your ideas. It can’t be a particularly big effort.

I am especially interested in the iDM AERO SLM, which, however, looks on the (not very informative) homepage as if it necessarily has to stand in a corner in order to breathe on two sides.

That applies to all heat pump (outdoor) units. On one side air is drawn in and on the other side blown out. Side clearances must also be observed. Basically, the air flow can also be extended – I know this from all the Geisha forums. To what extent lengths, air resistance, etc. then have to be taken into account, I can’t tell you. However, I wouldn’t want to lead air around a corner.

All right, then I will get in touch with iDM.

Interestingly, I just found a 2020 ruling from the VG Mainz while googling, stating that heat pumps do not have to maintain any distances to anything (except, of course, their own technically required ones). Only noise protection regulations must be observed, i.e., the unit outside must not be too loud. In RLP, the limit in purely residential areas is 50 dB(A) during the day and 35 dB(A) at night. The AERO SLM with 29 dB(A) stays well within these limits.