Gas consumption too high?

  • Erstellt am 2014-02-21 07:45:20

haus22

2014-02-21 07:45:20
  • #1
Hello, we have built a KfW 70 house with 140 sqm of living space. Now we have been living here for half a year. It seems to me that our gas consumption is too high. We have two solar collectors on the roof. So far we have used about 1400 cubic meters. The whole house has underfloor heating. Upstairs it is mostly off. The heating is set to one. The flow temperature is 35 degrees. Is that normal?
 

Mycraft

2014-02-21 08:09:07
  • #2
Now turning off the underfloor heating on the upper floor is already a mistake... unless it is thermally separated from the ground floor... which it probably isn't...

Your solar collectors only bring something in the summer...

Also, the heating-up phase for the 1400 cubic meters is probably included as well...

Has a hydraulic balancing been done?
 

Der Da

2014-02-21 11:24:19
  • #3
We have a KFW 55 house and have consumed almost 750 m³ since March 2013 without the heating-up phase. We have 5m² solar collectors on the roof (west side), live in the sunny Südpfalz, and cook with gas.
The heating-up phase (radiators) alone was already 790 m³.

If you now convert this to the calorific value, we have:
750 * 11.1106 = 8332 kWh consumed.

What is your calorific value?
It makes a difference whether you have burned
1400 * 11 = 15400 or 1400 * 8.5 = 11900 kWh.

But if it really is your heating demand without the heating-up phase, you will probably end up with 2000 m³ per year, which is way too much.
At least in a new building.

Are the heating circuits separated on the upper and ground floors? Do you have an unheated bathroom upstairs?
When I read: heating off upstairs, then I have to ask: only one inhabited bedroom upstairs? Or unheated children's rooms?

We have set our heating so that all rooms are at 21 degrees. And all radiators are permanently fully turned up.
In the evening at 8:30 pm the heating switches off. In the morning, our bedroom is just over 18 degrees due to the operation of the ventilation system, which blows cold air into the bedroom. At 6:30 the heating switches on again.

Which heating curve do you have set? And in which region do you live?

Information is missing to estimate your consumption.
 

€uro

2014-02-22 08:22:30
  • #4
That can be significantly too much, but also too little. In other words, it cannot be assessed at all. Because the actual demand for heating and hot water is most likely unknown. => no basic assessment. Thus, any comparison benchmark is missing, and an evaluation is purely subjective! It is also unfortunate to consider short periods because these must be corrected.

Regards
 

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