Requirements for emissions

Emissions of nitrogen oxides (NO_x) from liquid and gaseous fuel local space heaters
shall not exceed the following values:

Product	Max. value of emissions of NO_x mg/kWh_input based on GCV
Product	Old regulation (EU) 2015/1188	New regulation (EU) 2024/1103
Open fronted , open to chimney LSH, balanced flue and flueless LSH	130*	120
Commercial LSH	200	180

* Note that (EU) 2015/1188 only refers to open and closed fronted LSH; please refer to the regulation for the definition of products.

For both regulations, NO_x is the sum of NO and NO₂, expressed in nitrogen dioxide. For 2024/1103, there is an additional requirement that space heating efficiency and NO_x have to be measured at once.