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The 100m was accepted by the approval authority without batting an eye? For everything >95m they already suspect mining law here and look very, very closely.

Laying distance according to heat demand does not sound fundamentally wrong. If it was actually calculated, then it’s okay. As I said, I can hardly estimate that; on the foil there are some marks. Either that’s a 5cm distance or 10cm. If that were 10, you would have 20cm in the open space. That would be quite a lot, but with good insulation and depending on the other conditions, that could be enough. Especially since the flow temperature is designed at 35 degrees. The catch is that heat pumps are more efficient the lower the flow temperature is. You can also set that. But if you have laid too large distances, in the worst case your room will no longer be sufficiently warm at low outside temperatures. The critical rooms are usually the bathrooms, because there is little floor area available. So you will be forced to operate with at least 35 degrees flow temperature because otherwise it won’t get warm. This comes at the cost of consumption. Heating buffer means that the heat pump does not heat directly into the heating circuit but first into a storage tank, the buffer, and from there the underfloor heating is then supplied. However, higher temperatures are maintained. It is also an efficiency killer.

We have also installed a wall heating in the bathroom to increase the surface area.

So in the PDF from Pedotherm it says directly that the engineering is part of their scope of services. That it is not an off-the-shelf system, but rather individually and precisely configured for each construction project. Including heat load planning. So I rely a bit on the company doing their job, I can’t do it any other way.