Natural gas is the most environmentally-friendly of all fossil fuels. It is mainly water steam and to a very small amount carbon dioxide that are generated during its combustion. Especially the so-called condensing boiler technology makes use of the fuel value of natural gas to up to more than 100%.

Natural gas is particularly environmentally-friendly, as the smallest quantity of CO2 and almost no respirable dust are generated during the combustion process; it is particularly traffic-reducing, as natural gas is transported in underground lines which avoids any annoyance by traffic emissions; it is particularly convenient, as any energy amount which is precisely needed is available without the need of domestic stock-holding; it is particularly cost-efficient, as no additional investments or increased operating expenses have to be calculated for environmental protection and comfort.