ᐅ What connections are required for outdoor units of heat pumps?

We have the issue that our utility room is not located on an exterior wall. Since a heat pump requires an outdoor unit, installing a heat pump is not straightforward for us. However, we have two empty conduits that were originally intended for a water-carrying fireplace, running from the utility room to an exterior wall. I still need to check exactly, but I believe these are two multilayer composite pipes. My question is: Can these pipes be used to connect a heat pump (air-source or ground-source)? Otherwise, we would have to completely break open entire walls just to get the lines outside somehow.

And what type of heat pump is it exactly (split air-to-water heat pump, monoblock air-to-water heat pump, ground source heat pump, ...)?

That is not decided yet. The existing pipes go to the garden and the terrace, and I would prefer not to have a noisy air-to-water heat pump there. Whether a ground-source (geothermal) heat pump would be worthwhile still needs to be considered.

Well, insulated pipes need to pass through there. They are relatively thick and rigid. What diameter nominal (DN) do you have?
90° bends are also not ideal.
In my case, a larger sewer pipe was installed through the floor slab specifically for the lines to the heat pump. However, the heating technician preferred to make a core drill hole through the wall instead. It was too difficult for him to get the insulated pipes through there. But this was also because the outdoor unit was located directly on the other side of the wall. If you have more distance on your side, it might be easier to route the lines...