KfW funding after 01.04.2016

Hello Oleda222,

great, thank you very much for the clear answer! It probably has something to do with the fact that the Energy Saving Ordinance 2014 is still valid by name and thus the house designations remain the same. That’s what I had hoped/suspected, but I was still confused.

Nevertheless, it will probably be tight for me with the KfW funding, because I have the following concept in mind:
- Massive, monolithic construction (Poroton or Ytong, because I simply want to build solidly)
- Gas condensing boiler (because it is simple and space-saving and my personal speculation is that the electricity price will rise faster than the gas price)
- Solar thermal energy (because I simply think heating or hot water with the sun is great)
- Controlled residential ventilation, central with heat recovery (because I already appreciate the comfort today)

I know only the energy consultant or architect can say for sure. Nevertheless: Is it even possible to think about KfW55 funding with this setup? Does anyone know or possibly have a similar setup and managed to achieve KfW55 with it? Do I have to push into the region of 50 cm wall thickness (which is actually a no-go)?

Thank you very much in advance for your answers!!!!

Hello D3N7S,

...I had already suspected that. What type of stone or wall thickness are you building with? And what windows are you installing? I guess we can count ourselves lucky if we still meet the energy saving regulations next year (i.e. KFW70). We definitely won't manage the building application this year, I have no illusions about that.

The only alternative is to switch from gas+solar thermal to heat pump+photovoltaics. But I don't like the fans or the outdoor unit of the air heat pump, a deep borehole is too expensive and ground collectors are out of the question because I want to keep the rest of the plot "unburdened" for possible redesigns (e.g. swimming pond or something similar). A pellet heating system is also out of the question due to space requirements.

I don't like the fans or the outdoor unit of the air heat pump ...

There are also air-to-water heat pumps that do not require an outdoor unit and are completely installed indoors. Either in the basement or in a suitably designed HAR; with a bit more effort, also in the attic. Rhineland greetings

We are installing a 36 cm brick (which exact one still needs to be determined) and triple glazing. Switching to KFW 55 with heat pump + photovoltaic? Those are quite significant additional costs compared to the gas boiler + solar – does the KFW even make sense in your case? The slightly better interest rates can hardly offset the additional costs... The only argument in favor is the ecological factor.

Can you give a clarifying example of the mentioned additional costs? I think maintenance costs, etc. should also be included in this. Can it roughly be estimated like this.. if yes, I would be interested in comparison figures, even if from next year the gas combo will be phased out due to the tightened energy saving regulations and is no longer up for debate.

Hello everyone,

the version where the heat pump supply and exhaust air are integrated in the house would be a must for me if a heat pump is used, meaning the only alternative.

Basically: The main point is to clarify whether we even want to try to obtain KfW funding. The tendency is towards "no" - we will build as economically sensible as we consider (which does not mean the heat pump is off the table). The general opinion here in the forum is also that a significant part of the funding is lost just through the reports, inspections, or construction supervision.

The 50 cm walls are really intense. The difference from the 36 cm walls amounts to about 5 m² per floor for a 100 m² base area - that’s quite something.

: You are right, only the ecological factor remains.