Silly waste of energy

Since 3 years that I'm leaving in this apartment I was convinced that the regulation system of my heating system would prevent waste of energy during summer time when heating is not required. How wrong I was! See bellow...

Average consumption of gas last year per month (flat over the year, no winter/summer difference) : 209.24 m3 per month

Average consumption of gas since I turned off the heating system : 138 m3 per month

Average consumption of gas since I turned off the water circulation in the radiators: 40 m3 per month.

Hell! I'm pissed-off by myself for having wasted that much energy (and money)!

So think about it if you have a similar heating system...