Is KfW 70 possible without a solar thermal system and with a gas condensing boiler?

Hello dear forum members,

we are planning the new construction of our single-family house and hope for Kfw 70; but first, here are our key data

Solid construction, 2 full floors without basement, living area 152 sqm
Top ceiling drywall, 24cm insulation WLG 0.35

Aerated concrete 0.09 WLG/qmK, 36.5 cm

Plastic windows triple glazing Ug=0.7 W/qmK

Underfloor heating insulation with Styropor (thickness is still unknown to us, but we will clarify quickly)

Gas condensing boiler

Now to our problem; originally we planned our house with an air heat pump, but the general recommendations were too opaque for us. Euro also recommends refraining from an air heat pump without an exact energy calculation.

Our energy certificate was still calculated with the air heat pump with the following result:
qp = 47.51 kWh/qmA
HT = 0.30 W/qmK
Heat energy demand building = 12168 kWh
Thus, the tightened requirements by 15% are met, and KfW 70 would be possible.

Do these values deteriorate so significantly by using the gas condensing boiler that KfW would no longer be possible? According to an employee of the energy advisor, this would only be possible with 2 or 3 solar thermal systems. Super accurate information!!!!!
We do not understand this in connection with the 15% rule. Our heads are spinning...

Who can help us?

Hello,

...we do not understand this in connection with the 15% rule. Our heads are spinning...

The 15% rule refers exclusively to §§ 7, 9 as well as Annex VIII EEWG. If you want to achieve KfW 70, these funding requirements apply additionally. Best regards