ᐅ Heating costs for KfW55 – electricity costs seem too high to me
Created on: 7 Nov 2018 19:56
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Der-w
Hello everyone,
In the energy performance calculation of the house we are interested in buying, the following is stated:
I think the energy demand is relatively low. The living area is estimated at approximately 145m² (1560 sq ft) in the specifications.
However, the heating costs of about 1200 euros per year seem quite high to me for such a good demand value, since I often read on this forum that many only need around 600 euros.
The heating system is a Rotex HPSU Compact.
Am I missing something?
Thank you.
In the energy performance calculation of the house we are interested in buying, the following is stated:
I think the energy demand is relatively low. The living area is estimated at approximately 145m² (1560 sq ft) in the specifications.
However, the heating costs of about 1200 euros per year seem quite high to me for such a good demand value, since I often read on this forum that many only need around 600 euros.
The heating system is a Rotex HPSU Compact.
Am I missing something?
Thank you.
Der-w schrieb:
Here is a picture of the HT value
Thanks for the tips.
I will look it up online Is this really a KfW55 house? Somehow, I’m starting to doubt if the listing is accurate.
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boxandroof16 Nov 2018 21:54I don’t think so, but I’m not an expert and don’t know if it’s possible to somehow get around it with other measures. As I said, for KfW 55 the value should be 0.28 or better, 0.24 for KfW 40. 0.35 is already quite far off.
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Mottenhausen16 Nov 2018 23:22No, it’s not KfW55. The heating energy demand should be below 35 kWh/m² per year (yours is 50.15).
And the heat transmission loss should probably be no more than 70% of the reference building, not 94.74%.
So it’s also not KfW70 (maximum 45 kWh/m² per year) and possibly not in line with Energy Saving Ordinance 16, although I’m not sure about that.
And the heat transmission loss should probably be no more than 70% of the reference building, not 94.74%.
So it’s also not KfW70 (maximum 45 kWh/m² per year) and possibly not in line with Energy Saving Ordinance 16, although I’m not sure about that.
Yeah, something seems off...
Both values must be below the reference value to qualify as a KfW55 house.
What’s not right in your case are the reference values. I’m aware that the reference values apply specifically to this building, but here they are simply too high to be considered a KfW house. My reference for Ht is 25.6 and for primary energy it’s 49.7.
The primary energy value seems to fit the KfW55 standard.
But the Ht reference value is too high. Therefore, it’s not a 55 house.
Both values must be below the reference value to qualify as a KfW55 house.
What’s not right in your case are the reference values. I’m aware that the reference values apply specifically to this building, but here they are simply too high to be considered a KfW house. My reference for Ht is 25.6 and for primary energy it’s 49.7.
The primary energy value seems to fit the KfW55 standard.
But the Ht reference value is too high. Therefore, it’s not a 55 house.
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