ᐅ Is the energy consumption estimate provided by the energy consultant realistic?

Hello everyone,

We are currently building a new house (KFW 55 standard).

Facts: 2 floors, hipped roof
36.5cm (14.4 inches) insulated brick wall, TV07
Basement insulated with 12cm (4.7 inches)
Windows Internorm FK 410, Uw=0.68 W/m²K
Living area is calculated at 166 m² (1,787 sq ft)
Pellet heating system with approximately 10 kW

The energy performance certificate states that the consumption will be "only" 24 kWh/m².
When I calculate this, I get a pellet consumption of about 850 kg (1,874 lbs) for heating.
Is that possible, or have I made a calculation error?

A solar thermal system is planned for domestic hot water in the summer.

Best regards

In my experience, the values in the energy performance certificate are not suitable for estimating the building’s fuel consumption. I asked the architect for the “specific heating demand” of my house, and it was significantly higher than the values in the energy performance certificate (I have no idea how the certificate is calculated. I heat with a heat pump). The floor area used for the calculation was explicitly the usable floor area of the house, not the living area.

Regards, Karl