ᐅ Is it feasible to achieve KfW 55 energy efficiency for a 170 m² single-family house without a basement using this heating system?

Hello,

we are currently planning a single-family house of about 170m² (1830 sq ft) without a basement, aiming for the KfW 55 standard.
I have a question regarding the heating system. I have tentatively chosen the following combination:

- Gas boiler
- Ventilation system
- Water-carrying tiled stove

Is it possible to achieve the KfW 55 standard with this system?

Is a water-carrying tiled stove necessary at all? Since the house is indirectly heated through the tiled stove with ventilation, isn’t that sufficient?

Solar thermal systems would hardly be an option for me, as we are a two-person household and personally I only shower or bathe at home a maximum of twice a week.

We are currently planning a single-family house with about 170m² (1830 sq ft) without a basement, built to KfW 55 standard.
I have a question regarding the heating system. The following combination is what I initially chose:

- Gas boiler
- Ventilation system
- Water-bearing tiled stove

Can I achieve the KfW 55 standard with this system?

It is not possible to say outright whether a KfW Efficiency House 55 can be achieved with the described setup without a solar system. For this, the plans would need to be reviewed (passive solar design, thermal insulation values, transmission heat loss, floor plans, location, orientation). Is there a thermal protection certificate?

Is a water-bearing tiled stove really necessary? The house is indirectly heated by the tiled stove with ventilation, right?

Personally, I would install the tiled stove without water-bearing functionality. I wouldn’t be in the habit of regularly lighting the stove. In that case, such a system makes little sense, especially since the startup phase until effective heat transfer to the storage is relatively long. The advantage of a stove without a water jacket is also that it can be used to heat the house during a power outage.

Solar thermal would hardly be an option for me in advance since we are a two-person household and I personally shower or bathe at most twice a week at home.

That is a valid consideration. A solar thermal system often does not pay off. When it produces a lot of heat, people are usually on summer vacation or the thermal surplus remains unused in the storage. In winter, when heat is needed, solar heat gains are not available. Ecologically, the balance looks good, which is why the primary energy factor for the efficiency house with solar thermal appears better.

I recommend building with a very well-insulated building envelope and covering the low heat demand with a heat pump. Then it might be possible to build a KfW Efficiency House 55 without a solar thermal system, but the ventilation system must be taken into account in this case.

Best regards

T.H.

Hello,

schlunzino schrieb:
...Can I achieve the KFW 55 standard with this system?

That will most likely be somewhat difficult.

Best regards