The following certification scheme covers micro-combined heat and power units producing heat and electricity from fuel cell, internal combustion engine or external combustion engine (Stirling engine) technologies. The scope of the program is limited to devices fueled with gas and delivering an electrical power up to 50 kW. These units may contain, as the case may be, an integrated auxiliary gas heat generator and/or a heat accumulator.
The NF brand certifies energy performances, sound power, pollutant emissions and the safety of these products in accordance with applicable European standards. In addition, it guarantees the conformity with the regulatory thresholds of seasonal energy efficiency and emissions of nitrogen oxides. The performances of the certified ranges can be compared on a common and reliable base and valued through the French Thermal Building Regulation, the Eco-design and labelling regulations, the feed-in tariffs for electricity. Controls include independent laboratory testing and factory audits.