Many German home owners are likely to have lost in recent years, the interest in a well-functioning and efficient heating system. For four years, the Gas and Oil prices declined. But times are changing. Heating oil has gone up so much already. According to the calculations of the comparison portal Check24 2000 litre cost on average in August 1421 Euro. So expensive it was last updated in August 2014. Gas is also likely to be soon more expensive. Reason enough to check the burner, cables and thermostats to their efficiency. After the heating function is in operation, and after a few minutes, no bad leaks in the pipe system have occurred, you should wait 24 hours.