The RS 310-410-510-610/M BLU burners series covers a firing range from 1200 to 6250 kW, and it has been designed for use in low or medium temperature hot water boilers, hot air or steam boilers, diathermic oil boilers. Operation can be “two stage progressive” or, alternatively, “modulating” with the installation of a PID logic regulator or by external 4-20 mA/0-10 V signal. The mechanical cam device of regulation allows to catch up a high modulation ratio on all firing rates range. The burners can, therefore, supply with precision the demanded power, guaranteeing a high efficiency system level and the stability setting, obtaining fuel consumption and operating costs reduction. The combustion head, engineered with advanced simulation devices, guarantees reduced polluting emissions (NOx < 60 mg/ kWh). FS1 and FS2 versions are available for intermittent and continuous operation applications. The exclusive design ensures reduced dimensions, simple use and maintenance. A wide range of accessories guarantees elevated working flexibility.