Air-to-water heat pump sizing in new construction

I think that doesn’t look bad, the circuits are quite balanced.

One could check if the shower with wall heating is still covered in the guest WC, and possibly 5 circuits of 80 meters each in the living area.

Has the connection of the HKV also been calculated from the office, it must not be too small in diameter.

Try to arrange with the heating engineer that he always installs the circuits in one piece without pressing the pipes. He may then want more money, but you will have no joints with pressure loss or potential weak points.

In the hallway it gets cozier than in the bathroom. All the pipes running through there can be somewhat fanned out and the individual circuit can be omitted.

The hallway gets warmer than the bathroom. You can fan out all the pipes that go through there a bit and omit the dedicated circuit.

I thought the same once, and by default no heating circuit would be planned for the upstairs hallway, since it warms up anyway. However, after reading the relevant threads here about heat pumps, flow temperature, and cold bathrooms, I'm unsure.

I would have said, yes, of course: all the pipes run through the hallway and heat it up. However, if the hallway has its own heating circuit, the pipes passing through give off less energy before they reach their designated room. In low-temperature systems, every heated room also heats the unheated rooms. That would mean, for example in my upstairs hallway, that my bathroom heats the hallway and then I lack energy again in the bathroom.

So, in the hallway area, it's better to have it than to need it. At the manifold, I can still shut off the flow if it really gets too warm, right?

Basement hallway:



Ground floor hallway:


This one also heats the basement ceiling from the unheated area, thus the basement hallway and the two basement rooms as well.



The upstairs hallway looks a bit exaggerated. However, there is also an exhaust valve from the controlled residential ventilation here – meaning the warm air is constantly being pulled out.

Try to arrange with the heating installer that he always lays the circuits in one piece without press-fitting pipes.

He may want more money for that, but then you won't have connections with pressure loss or potential weak points.

First, I would like him to even agree to this and to keep the laying distances and lengths. Then the details come.

If the hallway, however, has its own heating circuit, the pass-through pipes give off less energy before they reach their target room.

Include it, because you can still completely shut it down if needed. Or set it to 0.2l.

Is that a tiled walk-in shower? If yes, please provide documentation. Maybe you can also create two heating circuits and to gain length from one heating circuit, lay the return flow in the hallway. This way you also increase the average water temperature for the part in the bathroom and can better balance the lengths. I did it the same way myself.