How much gas does the old building use? Values, calculation tips

How much gas does the heating in an old building actually use?? Many homeowners and tenants only find out about this at the beginning of the new year and are amazed at the amount of the bill. There are guidelines, how high the consumption should be about.

Calculate gas consumption

Generally, gas heaters are not bad, especially in unshamped old buildings, the heating costs are often very high. Of course, the heating behavior of the house dwellers. While some people with lower temperatures around 18 ° C, others need significantly more than 20 ° C. The gas consumption increases


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The gas consumption is given at the annual bill in kilowatt hours. Every kilowatt hour has its price, the bill is therefore understandable. But if you want to check the gas consumption under the year, you need a few numbers more:

  • The cubic meter, which can be found on the gas meter
  • The condition number which indicates the ratio of the gas volume in the normal condition and in the operating condition
  • The calorific value of the gas

The amount of kilowatt hours results from the formula kilowatt hours = number of cubic meters x condition number x calorific value

Normal gas consumption

As for normal gas consumption, there are relatively clear figures. According to this, a single-family house with an area of 160 m2 and built until 1977 (which also includes old buildings) should be around 32.Consume 000 kilowatt hours per year. In new buildings from 2002 onwards, consumption is only half as high.

In most houses, hot water is included in the gas bill. If this is not the case, you can deduct around 1000 kWh per person annually.

Excessive gas consumption? Heat properly!

What can you do if the gas consumption is much higher or you generally find it to be high? On the one hand, as the owner of an old building, you should consider whether you can insulate the facade and replace the windows. This not only saves energy, you also feel much more comfortable when there is not always a draft in the rooms in winter.

On the other hand, the heating behavior can be changed. Even a slightly lower temperature has a positive effect on the heating bill. There are also other tricks you can use to save heating costs, for example by never turning off the heating completely when you leave the house.