Several years ago, three basic emission classes of boilers were distinguished – from 1 to 3 (best/highest), which was defined in the EN 303-5 standard from 2002. However, within 10 years, new regulations were prepared, which were included in the updated standard in 2012. They presented three new classes with more stringent emission conditions: from 3 to 5, where 5 is the most restrictive and therefore the best class.
It is worth noting that many older models of boilers still do not have any class on the rating plate, because it was not required before. Only people trying to obtain a subsidy for the purchase of a boiler tried to obtain it. However, the new standard already enforces the marking of a class on each boiler, according to their degree of harmfulness to the environment.
What conditions must be met?
In order to receive a rating plate with class 5, the boiler must meet very restrictive conditions, which are specified in the EN 303-5:2002 standard. These include, among others: