Geothermal heat pump installation location and preparation

You can supply the electric cartridge separately, but in my opinion that only makes sense if you want or have to install an EVU lockout, and your electricity provider definitely wants to cut off the power supply for that. Of course, it's much smarter to do everything via switching contacts (hence the recommendation to provide either signal cable or CAT cable additionally). You can lay 5x1.5 mm2 for a control voltage anyway, it can be laid cost-effectively together with the 5x4 mm2, and then you have all options open.

Yes, I will probably really go with 4mm2 and lay the 5x1.5mm2 additionally. That should be a minor extra effort.

I meant either A or B, but directly through the outer wall. If B is not significantly more expensive/problematic regarding earthworks & later restrictions (e.g. planting, etc.), then of course you can take B. However, this should be discussed with your drilling company beforehand, because there are a few details that might still play a role, e.g. bending radii for changes of direction as well as the usually desired slight slope towards the house entry, so that the line is vented there.

Version B would mean about 7m more conduit feed. It would then run along the house side into the garden. Part of it will be paved later and is the car parking space. I would really find it good if I could discuss this again with the heating installer. Let’s see if he agrees to that. Somehow I have the feeling that for him my heating system is still so far on the horizon that he doesn't want to deal with the details yet.

No idea what is meant – hot water & heating supply/return are connected directly to the heat pump (of course with appropriate shutoff options and filters, manometers, expansion vessel, etc.), I don’t know what would be different with passive cooling (but I don’t have it myself, so…). Maybe sensors / dew point monitoring? Depending on the concept, you could place it there, though in my opinion it makes more sense in the rooms themselves (or if you want to be very precise, in the floor structure).

I understood it so that, to prevent the pipes from ending up somewhere on the wall, there is something like with a heating circuit distributor. A kind of connection panel where the corresponding pipes all come together. I will try to ask again here to get details.

Thanks first of all for your helpful comments.

Version B would mean that about 7m more supply pipe is coming. It would then run along the house side into the garden. Part of it will be paved later and is the parking space for the car. I would really find it good if I could discuss this once again with the heating installer. Let’s see if he agrees to that. Somehow I have the feeling that my heating system is still so far on the horizon for him that he doesn’t want to deal with the details yet.

How are the trades divided up in your case? Does the heating company do the drilling as well (rather rare)? If not, it is usually the case that the drilling company is responsible for everything up to the handover point at the heat pump (brine in/out with shut-off valve, usually right next to the heat pump, including wall penetrations, sealing, etc.) – if that is the same for you, I would definitely discuss it with them first and be sure to clarify the additional costs for the extra length. Some already have their own ideas about that...

I understood it such that, so that the pipes don’t end somewhere on the wall, there is something like at a heating circuit distributor. A kind of connection panel where all relevant pipes come together. I’m trying again here to inquire for details.

It depends on how your branch distribution is planned – is there even a plan for it? If you have a heating load calculation, a hydraulic schematic is often included, showing how the lines are planned and dimensioned. For normal house sizes, I usually know that only one branch is routed "upwards," and from there it is split to the floor heating circuit distributors.

If underfloor heating is also planned in the basement or if structural conditions make several branches for the floors reasonable, then a distributor downstairs would be necessary. It must be insulated just as well as the pipes themselves, and this is especially because you also have cooling, with diffusion-tight insulation.

If not, it is usually the case that the drilling company is responsible for everything up to the handover point of the heat pump (brine inlet/outlet with shut-off valve, usually right next to the heat pump, including wall penetrations, sealing, etc.) – if it is the same for you, I would definitely discuss this with them first and be sure to clarify the additional costs for the distance.

Civil engineering usually comes extra and must be coordinated with the drilling company.