According to the Federal Association of Chimney Sweeps - Central Guild Association (ZIV), there are over 11 million single room heating appliances in Germany (sources: ZIV survey, HKI estimates), which - increasingly with modern combustion technology - also support or relieve the central heating system on cold evenings.

Since the majority of emissions are produced during the combustion process, the focus with regard to emission reduction was particularly on primary measures (design measures), such as the use of modern materials, flow-systematised combustion air and flue gas routing. With success: for example, an optimised air supply and innovative combustion chamber linings can reduce emissions by up to 85 % compared to old appliances.

Modern control and sensor technology that regulates the combustion itself without any intervention by the operator once again confirms the high degree of innovation in the industry. The risk of faulty operation can thereby be reduced. The appliance can thereby achieve a high degree of efficiency under suitable operating conditions, and fuel consumption can be reduced. Together with suitable emission reduction technology (so-called secondary measures), particulate matter and other emissions can be further reduced.