ᐅ Heat Pump Next to Basement Window Well – How to Insulate?

Hello,
we have installed a Vitocal 300-A from Viessmann, which is mounted on two basement light wells.

Unfortunately, we have noticed that the rather piecemeal installation in the light well (see photo) has many gaps and a constant draft from outside can be felt.

Does this light well cover for the heat pump really need to be airtight?
Is using expanding foam the only option, even though it looks untidy?
Or what experiences do you have? How could this be done more efficiently and neater?

I would really appreciate any suggestions and feedback.

Hello,
the heating company responsible sprayed UV-resistant construction foam on the outside of the basement window well cover, sealing it completely.
We are now satisfied with this solution, and there is no longer any draft; however, we obtained this solution mainly due to our persistence and constant follow-ups... management became very interested in finding a solution and implementing it without complications at a certain point.
Therefore, the matter is now settled for us as well.
Best regards from Saarland

Construction foam is neither watertight nor airtight – so it’s more of a makeshift solution 🙁.

Hello,
the description of the UV-resistant 2-component PU foam used says otherwise... of course, it might just be a marketing claim ;-)!
Okay... my mistake; I should have mentioned right away that no standard construction foam was used.

PU foam is still not airtight – however, it can be waterproof (well foam).

And the pipes inside are not insulated?