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From January 1st, 2025, the following will apply: 1.25 grams of CO / m3 0.04 grams of fine dust / m3 Efficiency varies: Flat-firing stoves 73% Coal-fired stoves with long-lasting burners 75% Tiled stoves 80% Pellet stoves 85% Exceptions: Open fireplaces that are used no more than eight days a month for no longer than five hours each. Fireplaces and stoves built before January 1st, 1950. Stoves that are used for craft purposes. Stoves and ovens that are fired with wood and have a heat output of less than 15 kilowatts. Stoves and fireplaces that are used as the only heat source for a residential unit. Stoves built between March 22nd, 2010 and December 31st, 2014. may have: 2 grams of CO 0.075 grams of fine dust 73% efficiency, as a transition period still applied at that time. You can find out more on the HKI database: https://www.cert.hki-online.de/de/ger... If you are affected, we recommend what is currently the most sensible thing to do and that is to invest directly in a good pellet stove: https://www.pelletofenstudio-roehrl.de/