New construction KFW55 house - heating design, different statements

  • Erstellt am 2020-12-05 13:15:13

T_im_Norden

2020-12-06 07:53:18
  • #1
The heating engineer normally thinks in such a way that he has as little work as possible with the customer and not that the customer heats as sparingly as possible.

With a well-designed underfloor heating system, you normally always have enough water in the heating circuits to defrost an air-to-water heat pump.

The reason why buffers are still often installed lies with the individual room controllers; through their switching behavior, they repeatedly cause entire rooms to be shut off.
If the defrosting process is to take place, it can happen that so many rooms are shut off that there is no longer enough warm water available.
The result is that the heating system goes into fault mode.
If the heating engineer, on the other hand, installs a buffer, he ensures that there is always enough water.

Those who have read up on heating with a heat pump and underfloor heating, on the other hand, will not use the ERR and therefore do not have this problem at all.
 

T_im_Norden

2020-12-06 08:03:24
  • #2
More important than the question of which heat pump you choose is the question of the underfloor heating itself.

Anything you do wrong here you cannot fix anymore.

A heat pump or the installation above the screed can always be changed, but everything that lies in the floor cannot.

Therefore, have it calculated externally with your house data.
 

T_im_Norden

2020-12-06 08:18:31
  • #3
https://www.hausbau-forum.de/threads/lwwp-dimensionierung-im-neubau.36049/page-21
 

DE_Haus

2020-12-06 09:35:53
  • #4
T_im_Norden first of all thank you very much for the information. I will read up on this thread Dimensionierung. We have an external KFW consultant, I think he can also calculate the underfloor heating.
 

nordanney

2020-12-06 10:30:36
  • #5
Find a suitable engineering firm that does nothing else. The KfW consultant is usually the wrong contact person and has no idea about the topic.
 

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