Why does the red provider build only with the AWP?

Hello,
why does the large red property developer build his KFW 55 houses (we like the promotional house V1 without floor plan changes (except for the staircase) and with our additional ideas we still stay within our budget) only with exhaust air heat pumps (Nibe F 755)?
Is the Nibe system so cheap for him or also economically viable for the builder in the medium term?
What do the 3.3 kWp photovoltaic system with the 2.8 kWh battery actually bring me economically?

I do not know any red property developer. But maybe a prefabricated house manufacturer.

You should read up on the different terminologies so that the question becomes more precise.

In my opinion, photovoltaic systems with batteries are still uneconomical, regardless of the sizing. If you assume a battery lifespan of 10-15 years, the only argument might be ecology. But even then, only if the manufacturing is excluded from the calculation.

Personally, I still like photovoltaic systems.

The larger red developer V..., mentioned here occasionally, has several model home parks including in Bad Fallingbostel or Horneburg. They are not prefabricated houses. The central question for us is whether the houses with Kfw 55 actually require "little" electricity for operating the exhaust air heat pump, or if the electricity costs increase significantly during the heating season and whether we can therefore also build a Kfw 70 house with gas condensing technology with another developer from the region.

Hello,

why does the big red developer build his KfW 55 houses (the promotional house V1 pleases us without floor plan changes (except for the stairs) and with our additional ideas we still stay within our budget) only with exhaust air heat pump (Nibe F 755)?

I have been wondering about that for years and I cannot understand it; in my opinion, it also does not fit the overall concept of the colleague, the red competitor. Besides, the heat generator is only useful in a real passive house; therefore, it is obvious to reduce the consumption costs with a battery. Common experiences regarding the operating costs of exhaust air heat pumps can be found widely on the internet; just not in the linked construction diaries on the provider’s page ;-)

The promotional house you favor is not really something overwhelmingly new. Considering that the architectures all revolve around at most 5 designs anyway, it quickly becomes clear that the red colleague moves exclusively within his design line.

Is the system so cheap for him or also economically viable for the home builder in the medium term?
What do the 3.3 kWp photovoltaic system with the 2.8 kWh battery actually bring me economically?

We have also included lithium-ion batteries in different sizes in our offer; in our system the manufacturer (Panasonic) guarantees 5000 charge cycles, which corresponds to about 20 years. To be economical, or up to 70% independent, larger systems than the system size you mentioned are recommended; especially because lithium-ion batteries have finally become affordable.

Whether — and from when — a photovoltaic system including storage pays off (from my subjective perspective totally uninteresting without storage) should be calculated by the system installer for the specific house. Note: the system installer and not the home salesperson or the red competitor colleague. Only then can you — knowing all facts (including the subsidy of the storage by the KfW) — decide whether the additional costs are economically interesting for you.

Rhenish greetings

Slowly again: Do you know what a [Bauträger] does? Does the [Bauträger] also offer the land? That makes a huge difference later on, also with other questions. And also pay attention when calculating that it is not a seller, but a corresponding professional. The former like to make the numbers look good.

The building plot is available. We are not buying a complete package of plot including house. The house is to be built with a "general contractor" and we only want parquet flooring and painting done. That the sellers from V... generalize numbers without knowing the plot in detail seems to me to be the case, even if the conversations appear customer-oriented. I have not yet received numbers for the determined values of a KfW 55 house. Detailed questions are explained by the engineers. After contract signing? Another provider looked into implementation possibilities according to the mentioned specifications and was about €25-30K higher including some additions than a KfW 70 house.