Construction of a 144 sqm bungalow in Fichtenwalde (near Potsdam)

Thank you for the tip. The floor will also be laid by the general contractor. Except for 3 rooms (bedroom, children's room, office), wood-look tiles will be used everywhere ( favorite covering) and in the remaining rooms appropriate vinyl. The tiles and vinyl have been ordered and also come from the general contractor's supplier. Only the tiles for the bathroom we ordered externally. However, there are no floor-to-ceiling windows in the bathroom and guest toilet.

Then that fits and at least you have no problems.

We have already discussed the temperatures of the individual rooms in advance. They will be between 19-21 degrees.

Brave. For me, a divorce would be imminent. A living room under 22-23° is out of the question for my wife. Children's rooms should also be comfortably warm, and I haven't even mentioned the bathroom yet.

Brave. For me, a divorce would immediately be on the horizon. A living room below 22-23°C is absolutely not acceptable for my wife. The children's room also has to be pleasantly warm, and I haven't even mentioned the bathroom yet.

If necessary, a radiant heater will be placed in the room :cool:

If necessary, a heating radiator will be placed in the room :cool:

Well, you can also design for warm and then throttle the heating circuit. That would be my recommendation. Everything 22°C, bathroom 24°C.
It can always be colder. It hardly makes any difference in the design of the heat pump.

Well, you can also set it to warm and then throttle the heating circuit. That would be my recommendation. Everything 22°C, bathroom 24°C. Colder is always possible. It hardly makes any difference in the design of the heat pump.

In our family, we heat very little. We are more fresh air enthusiasts than needing it to be very hot. And as my grandmother always said: "If you're cold, then just put something on" :cool:

They are here too.

Basically, I would request the heating load calculation "for the documents." 35°C is really not too ambitious as a target value.

It will work, and you can’t always optimize everything during construction. That makes you old.

13 heating circuits for 144 sqm? I find that too few. We have 13 heating circuits for 90 sqm. Note the pipe diameter from the heat pump to the heating circuit distributor. Do not let any bottlenecks be installed here, use sufficient pipe diameter. According to some experts, lowering the supply temperature (VLT) by 1 degree means an efficiency increase of 2.5%. Thus, reducing the supply temperature from 35 degrees to 31 degrees means an efficiency increase of 10%. Even an 8% improvement would already be a good result. You had written that the screed will be installed soon. So beforehand, the underfloor heating must be installed. For this, the heating engineer needs the heating load calculation for laying the underfloor heating! Keep in mind that mistakes in the design of the underfloor heating remain in the house forever. You can always change your heat pump, but not your underfloor heating. For the design, we chose 22 degrees in the bathroom and 21 degrees in the other rooms. Everywhere a laying distance of 11 cm, bathroom 5.5 cm also under shower and bathtub. How much power does your heat pump deliver? From my point of view (subject to a correct calculation), 5, max 6 kW should be sufficient.