Energy certificate is here - KFW 70 or even 55? Who can help?

Hi guys,

I just received the energy certificate for our planned house. We need this for applying for the KfW loan.

Until now, we thought we only had KfW 70, but I can't make sense of the energy certificate.

Here are the data:

Final energy demand of this building: 18.7 kWh/(m²a)
Primary energy demand: 48.5 kWh/(m²a)

What does this mean for me now?
Do I even have KfW level 55 with this?
And therefore entitlement to the repayment grant?

Who knows about this and can help me?

Hello,

the following data are important:
1. Primary energy demand of your building and the reference building
2. Transmission heat loss of your building and the reference building.

For [KfW Effizienzhaus 55], the primary energy demand may be at most 55% of the value of the reference building and the transmission heat loss at most 70% of the value of the reference building.

The final energy demand is not relevant.

Regards

Oh, that refers to %. I thought that was related to these numbers.

So basically, since I have 48.5 kWh/(m²a), I thought I would have, so to speak, KFW 48.5 and thus achieved efficiency level 55.

But still a good value, right?

How do you calculate the approximate annual consumption with these values? I mean in terms of cost?

It is an air heat pump with controlled residential ventilation and heat recovery.

So I calculate:

18.7 kWh/(m²a) x 165m² = 3,085.5 kWh
3,085.5 kWh x 0.15 EUR (electricity price heat pump at ÃœWAG Fulda) = 431.97 EUR
431.97 EUR / 12 months = 36.00 EUR

Is that calculated correctly?

Does this calculation usually come close, or not?

But still a good value, right?

Could be, I don’t know your house nor the values of the reference building. But I think so.

I then calculate:

18.7 kWh/(m²a) x 165m² = 3,085.5 kWh 3,085.5 kWh x 0.15 EUR (electricity price heat pump at ÜWAG Fulda) = 431.97 EUR 431.97 EUR / 12 months = 36.00 EUR

Is that calculated correctly?

Yes, roughly speaking you can calculate it that way.

Regards

Hello,

...Is this calculation correct?
Based on experience, does this calculation hold up, or not?

Unfortunately not! You cannot determine consumption from the Energy Saving Ordinance/KfW proofs, nor dimension a heating system with the data. They only serve for the primary energy proof/comparison based on standardized boundary conditions. For a reliable consumption forecast, the actual and real boundary and usage conditions of the specific building project are used.
It is especially common that air heat pump systems do not achieve the annual performance factor used in the proofs, resulting in excessive consumption costs for heating/DHW. The causes are usually inadequate or missing dimensioning/calculation of the overall system or unsuitable combined devices. Relatively rarely is it due to the devices themselves.

Best regards