The topic of the environment has always accompanied Mr. Heissenbüttel, from the first to the last day .. All new changes in legislation in the past required and still require the development of environmentally friendly burners. At first it was a technical instruction on the control of the air basin, and after 13 and 17 federal laws on protection against emissions. These documents have constantly tightened the requirements for air emissions. Quote from Mr. Heissenbüttel:

“I still have fresh memories of how I showed my son the pine forests in the Harz without needles. The reason for this was the sulfur in the fuel and hence the acid rain as a result. Sulfur-containing fuel in 80- e years was banned in Germany in other neighboring countries. "