Steel pellet boiler, with automatic burner cleaning, fuel ignition and hydraulic kit, with 91.1% efficiency and power of 11, 15, 22, 31 and 41 kW. The boiler has modulated power and automatic ignition and extinguishing. Its equipment includes a stainless steel burner with automatic cleaning, weather control with touch display, a heat exchanger cleaning system operated by a lever, a fuel-fuel tank in several capacitive versions, a hydraulic kit with thermostatic valve and an energy-saving pump. The boiler can also be equipped with VACUM, namely a pneumatic fuel transport system from a larger container, a lambda probe and automatic heat exchanger cleaning. *ROTOR SAFETY VALVE (Best protection against pellet hopper ignition) *AUTOMATIC HEAT EXCHANGER CLEANING OPTION *AUTOMATIC PELLETS FEEDING *AUTOMATIC FUEL IGNITION *AUTOMATIC ASH COLLECTION OPTION *STAINLESS STEEL BURNER *AUTOMATIC TORCH CLEANING *FUME FAN *SMALL CIRCULATION UNIT WITH THERMOSTATIC MIXING VALVE OPTION