Design of underfloor heating for KFW 55 house with ventilation system

Yes, so the under-coverage in the bathrooms is indeed a problem for me. But yes, I also think that it can still be managed.

Basically, I would have tended more towards a 15 cm installation spacing in the living and bedrooms. That is not possible with the planned system. Going down to 12 cm everywhere is perhaps a bit too much...

The planning comes from the planning office he commissioned. However, it sounded on the phone as if it would also be implemented that way. I have now asked him for an appointment and then we'll see what he suggests for optimization. I will gladly share the result of the conversation.

I wish you much success with your underfloor heating.

Why do you actually want 15°C in the hallway and in the utility room, and only 20°C everywhere else? Isn't that a bit chilly?

Why do you actually want 15°C in the hallway and utility room, and everywhere else only 20°C? Isn't that a bit chilly?

The hallway actually surprises me a lot. We did not specify the values like that. What would be an appropriate value for living rooms? Is 20 too little there? What would be appropriate? 22?

22 would be ok, turning it down with the flow temperature is always possible. At 15 degrees, you cannot increase the temperature arbitrarily if the laying distance is too large.

Because that is what the standard states, bathroom 24°, living rooms 20°, ancillary rooms 15°. If the heating technician installs it as the planner calculated, then I would also increase it a bit there. This leads to (anyway more reasonable) smaller installation spacing in the living rooms. Be careful that they don’t just turn up the flow temperature to reach the values.

Hi, a temperature difference from 24°C to 15°C cannot be achieved with KfW 55. If it is implemented as planned, you will be heating the adjacent rooms with the bathroom, which is already underheated. Better plan with 24°C for the bathrooms and 22°C for the rest. Will a [controlled residential ventilation system] also be installed?