The cold days have started in Germany. That means we need the heater at home to stay warm. The improper function of the heater may lead to high energy costs which you pay as Nebenkosten. In order to save money and also ensure the proper working of the heater, it’s important to vent the heater. It is a quite simple process that takes approximately 2 minutes to complete. Improper function You can easily identify the improper function by touching the…