During the operation of a solid fuel boiler, ash accumulates in the ash pan, furnace, as well as the convective part of the heat exchanger. Delayed cleaning of these parts of the boiler leads to power and efficiency reduction. To ensure efficient operation and continuity of service of the boiler, we propose to use automatic (unattended) ash removal of the boiler, thus enabling the smooth operation of the boiler and reducing the impact of the human factor on boiler maintenance. The ash removal system is a construction design based on the principle of joint work of the movable floor and the screw conveyor, engineered for centralized removal of ash, poured from the furnace of the boiler to the bottom of the ash pit and then entering the ash tank. This design substantially simplifies and mechanizes the process of unloading ash from the boiler, which allows to increase the service life of the boiler. The frequency of cleaning such a tank from ash depends on the quality of fuel and boiler settings. Accumulation tanks are designed for uninterrupted operation for 4-5 days.