Hello,
we are building our house to KfW 40 plus standard. The general contractor says that a hot water circulation pump is not allowed, otherwise it would no longer meet KfW 40 plus requirements. However, when I check directly with KfW, for example in the sample "Confirmation for Application (BZA)," it literally states in point 2: "A domestic hot water circulation is permitted."
Does anyone have experience with KfW 40 plus and a circulation pump?
And one more question: By what latest point should the heating demand calculation be completed by the general contractor? And by when should the applications for KfW 40 plus be submitted by the general contractor? We have already submitted the building permit / planning permission application, and would now really like to proceed with financing, but there is still no information from the general contractor regarding KfW.
Thank you very much,
Jörg
we are building our house to KfW 40 plus standard. The general contractor says that a hot water circulation pump is not allowed, otherwise it would no longer meet KfW 40 plus requirements. However, when I check directly with KfW, for example in the sample "Confirmation for Application (BZA)," it literally states in point 2: "A domestic hot water circulation is permitted."
Does anyone have experience with KfW 40 plus and a circulation pump?
And one more question: By what latest point should the heating demand calculation be completed by the general contractor? And by when should the applications for KfW 40 plus be submitted by the general contractor? We have already submitted the building permit / planning permission application, and would now really like to proceed with financing, but there is still no information from the general contractor regarding KfW.
Thank you very much,
Jörg
B
Bau-Schmidt18 Sep 2017 07:46Good question, that’s also how I read it.
Six years ago, the statement was also: circulation pipe with KfW (German Development Bank) does not work. The energy loss would be too high.
The KfW calculation came to us only after the building permit / planning permission application and financing signature (we then submitted the KfW calculation later).
The KfW calculation came to us only after the building permit / planning permission application and financing signature (we then submitted the KfW calculation later).
D
DragonyxXL20 Sep 2017 12:35Relatives of mine built to KfW70 standard and, for energy efficiency reasons, were apparently not allowed to install a circulation pump. We built to KfW50 standard with a circulation pump.
Side question: Where exactly is the energy lost? The insulated water pipes are located within the insulated envelope, aren't they?
Side question: Where exactly is the energy lost? The insulated water pipes are located within the insulated envelope, aren't they?
Hello,
Yes, in winter there is practically no loss there since you’re heating anyway. However, in summer, the circulation pump does cause some energy loss that wouldn’t occur otherwise.
This regulation is, once again, more of an ideological measure.
Best regards,
Andreas
DragonyxXL schrieb:
Side question: Where exactly does the energy go? The insulated water pipes are located within the insulated building envelope, right?
Yes, in winter there is practically no loss there since you’re heating anyway. However, in summer, the circulation pump does cause some energy loss that wouldn’t occur otherwise.
This regulation is, once again, more of an ideological measure.
Best regards,
Andreas
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