Painted steel structure with stainless steel door. Flame control photocel. Delayer total stop with leakage control. Automatic by pass valve. Safety valve. Temperature adjustment thermostat (flow switch and pressure switch). High efficent stainless steel vertical boiler. Ventilation by independent electric motor. Water level control float and machine stop in case of lack of water. Double flange motor. Motor and pump connection with elastic coupling. High pressure chemical sunction. 24V low tension electrical controls. Magnetothermic overload switch. Internal acustic and thermic lagging (anti frost protection). Loackable eletrical controls.