Problems / KfW70, Alternative Pellet Heating, Experiences

Hello dear members,

The following problem.

I am currently in the process of building a multi-family house with 10 residential units. All plans have been created, building application, etc. is in progress. My architect is currently working on the thermal insulation. The building is to be constructed to Kfw 70 standard. He called me and said that he can't achieve the thermal insulation with the gas heating, no matter how thick the insulation would be, a Kfw 70 standard would not be possible. According to him, it would work with a pellet heating system! Now I don't really understand what one has to do with the other! Can someone enlighten me? Unfortunately, my architect is away for a week, so I can only get back to him after that. Honestly, I don't think much of a pellet heating system for such a large building with 4 floors and 850m2 living area, and besides, you need a huge tank/container for that. Do you have any tips for me? I urgently need advice.

Thank you!

Hello,

...He called me and said that he couldn't meet the thermal insulation requirements with the gas heating, no matter how thick he insulated, a KfW 70 standard would not be possible.

It would need to be clarified where the problem lies. At the H´t, or the Qp value.
Pellet heating systems benefit on paper from the low primary energy factor ;-)

best regards

Hello,

can you enlighten me a little more? What would you have done in my place? I urgently need tips

...can you clarify a little more for me? What would you have done in my place?

For this, the calculation must be available to see where the problem lies.

Best regards