ᐅ Air-to-water heat pump, mechanical ventilation with heat recovery?

Hello!

We are currently planning a single-family house with 172m2 (1850 sq ft) of living space here in the north, working with a well-established general contractor.
I want to build according to the KfW 55 standard and take advantage of the related funding.

I was shocked by the quoted all-inclusive price of 27,965 EUR for the following system:

Viessmann - Vitocal 200-A + (air-to-water heat pump)
Viessmann - Vitovent 300-F (central controlled ventilation with heat recovery)

They credited me 2,000 EUR for a gas condensing boiler.

My questions:
1. Is this a reasonable price? As I said, I was quite surprised.
2. Would a gas condensing boiler combined with solar thermal system plus controlled supply and exhaust ventilation with heat recovery also meet the KfW 55 requirements? (Additional insulation is in place)

I urgently need your advice.

Thanks in advance!

That doesn’t sound very cheap at first. A controlled residential ventilation system with heat recovery typically costs around €10,000 to €12,000 (depending on the version, it can be more or less). An air-to-water heat pump is available for about €10,000 (again, this can vary). Are the costs for the heating installation listed separately? Is the foundation for the air-to-water heat pump included?

It is a fixed lump-sum price that covers all services (or should cover them). Installation, laying, screed height adjustment, construction planning, etc. However, as is often the case, if an additional foundation is not explicitly agreed upon, it may incur extra costs. But as far as I know, there is a DIN standard for that.

Question:
Would a gas condensing boiler system combined with solar thermal plus controlled ventilation with heat recovery also meet the KFW55 requirement? (Corresponding additional insulation is in place)

Or can this be categorically denied because it is not feasible?

When did you submit your KfW application? After April 1st, a KfW advisor is required to perform, verify, and document all calculations. This person would be the best to answer your questions since they input your building data individually and can see your current status, what is missing, or where something can be omitted.

Yes, after April 1, 2016.
Okay, thanks. So the structural engineer, energy consultant, etc. are with the building contractor.