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They primarily serve operators of stationary combustion sources who need to find a professionally trained technician to check the condition of their combustion source - mostly solid fuel boilers. 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It records professionally qualified persons authorized to check the technical condition and operation of stationary solid-fuel combustion sources with a rated thermal input between 10 and 300 kW used as heat sources for central hot-water heating systems, under Act No. 201/2012 Coll. on Air Protection. The register is intended mainly for operators of such combustion sources, typically solid-fuel boilers, who need to locate a qualified technician for inspection. 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