Hello everyone,
We are very close to submitting our building permit / planning permission application.
But now the problem.
We always wanted a gas heating system combined with something modern (e.g., gas with solar thermal or a fuel cell) and to meet the KfW-55 standard. The combination with something modern should qualify for KfW-55 (this has already been clarified with KfW advisors).
However, the construction company claims this is not possible and that an air-source heat pump must be used instead (I assume because this is simply their standard and it’s the quickest and easiest option for them).
After some back and forth, the architect responsible for the building permit proposed the following: She plans to include an air-source heat pump in the permit application (since it definitely meets the KfW-55 standards) and we would first obtain the permit to avoid construction delays (we already have a contractually fixed timeline).
In the meantime, the company will calculate the KfW-55 specifications for the gas options described above. The company claims this will take a long time and we would lose a lot of time if we wait for that.
She said that later, regarding the changed heating system, we would simply need to send a “notification” to the building authority, and that would settle the matter.
1) Is this true? Are they really that indifferent to the heating system?
2) However, aren’t there other problems, for example with the KfW-55 application, which would theoretically have been submitted but with a different heating system?
3) Regarding the fuel cell, we were told that the KfW 433 application must be submitted prior to the start of construction… but that does not mean “with the building permit application,” right?
Thanks in advance!
Best regards
Kerstin
We are very close to submitting our building permit / planning permission application.
But now the problem.
We always wanted a gas heating system combined with something modern (e.g., gas with solar thermal or a fuel cell) and to meet the KfW-55 standard. The combination with something modern should qualify for KfW-55 (this has already been clarified with KfW advisors).
However, the construction company claims this is not possible and that an air-source heat pump must be used instead (I assume because this is simply their standard and it’s the quickest and easiest option for them).
After some back and forth, the architect responsible for the building permit proposed the following: She plans to include an air-source heat pump in the permit application (since it definitely meets the KfW-55 standards) and we would first obtain the permit to avoid construction delays (we already have a contractually fixed timeline).
In the meantime, the company will calculate the KfW-55 specifications for the gas options described above. The company claims this will take a long time and we would lose a lot of time if we wait for that.
She said that later, regarding the changed heating system, we would simply need to send a “notification” to the building authority, and that would settle the matter.
1) Is this true? Are they really that indifferent to the heating system?
2) However, aren’t there other problems, for example with the KfW-55 application, which would theoretically have been submitted but with a different heating system?
3) Regarding the fuel cell, we were told that the KfW 433 application must be submitted prior to the start of construction… but that does not mean “with the building permit application,” right?
Thanks in advance!
Best regards
Kerstin
and whether I read correctly. And what I read suggests that this will not work as planned. The idea is to submit an air-to-water heat pump to the authorities, do the calculations, and then ultimately declare that gas will be used instead, aiming to meet the KfW 55 standard. In the end, what will happen is that the air-to-water heat pump is submitted, but then it is said that gas and solar options are not feasible because the 55 standard cannot be met unless thicker walls or a more expensive foundation slab are used. And then? You either abandon the 55 standard or accept the air-to-water heat pump. Therefore, I recommend simply abandoning the 55 standard from the start, submit gas as the heating method, and be done with it.
M
Mottenhausen27 Nov 2018 14:44Or insulate properly from the start so that, despite using gas, it still meets KfW55 standards
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