ᐅ Is the district heating consumption too high for a KW 55 house?
Created on: 21 Nov 2019 15:55
T
Tom1971
Hello,
We have just taken over our house from the developer. It is a detached KfW Efficiency House 55, the blower door test was passed with flying colors, so the house is airtight. We have underfloor heating, and the heating system is connected to a district heating network (heated area 230 square meters (2475 square feet)). But now we have the following problem:
1. Within the first three days after handover, the calibrated meter recorded 470 kilowatt-hours of district heating consumption. Keep in mind that at the moment only the underfloor heating is running at 21 degrees (70°F), bathrooms and showers are not in use yet (we are moving in next month). So this consumption is exclusively from the underfloor heating.
2. When I extrapolate this to 30 days in November, this results in about 4700 kilowatt-hours of heating energy. Historically, November accounts for about 11.4% of the annual heating energy (source: Munich utility company averaged over all their district heating customers). Based on this, the annual consumption would be nearly 43,000 kilowatt-hours, or 185 kilowatt-hours per heated square meter per year.
3. According to the 2018 heating cost index for district heating, the average value is 133 kilowatt-hours per heated square meter per year, and this includes tens of thousands of buildings from the 1970s, 80s, and 90s with poor insulation. We are therefore nearly 40% above the average, which probably means 70–80% above the value expected for KfW 55 houses if compared.
Does this sound strange to you as well?
A technician for the heating system will visit tomorrow, but if they don’t find anything to explain the discrepancy, I will have to file a complaint immediately.
What do you think?
Many thanks in advance for your replies!
Best regards,
Thomas
We have just taken over our house from the developer. It is a detached KfW Efficiency House 55, the blower door test was passed with flying colors, so the house is airtight. We have underfloor heating, and the heating system is connected to a district heating network (heated area 230 square meters (2475 square feet)). But now we have the following problem:
1. Within the first three days after handover, the calibrated meter recorded 470 kilowatt-hours of district heating consumption. Keep in mind that at the moment only the underfloor heating is running at 21 degrees (70°F), bathrooms and showers are not in use yet (we are moving in next month). So this consumption is exclusively from the underfloor heating.
2. When I extrapolate this to 30 days in November, this results in about 4700 kilowatt-hours of heating energy. Historically, November accounts for about 11.4% of the annual heating energy (source: Munich utility company averaged over all their district heating customers). Based on this, the annual consumption would be nearly 43,000 kilowatt-hours, or 185 kilowatt-hours per heated square meter per year.
3. According to the 2018 heating cost index for district heating, the average value is 133 kilowatt-hours per heated square meter per year, and this includes tens of thousands of buildings from the 1970s, 80s, and 90s with poor insulation. We are therefore nearly 40% above the average, which probably means 70–80% above the value expected for KfW 55 houses if compared.
Does this sound strange to you as well?
A technician for the heating system will visit tomorrow, but if they don’t find anything to explain the discrepancy, I will have to file a complaint immediately.
What do you think?
Many thanks in advance for your replies!
Best regards,
Thomas
D
DanielHamburg21 Nov 2019 18:14And are you sure the unit kWh was read and converted correctly?