For the supply of pellets to the heater Thermobile has developed a supply unit and a storage container. The supply unit is equipped with two screw pumps so two heaters can be operated with one unit. The screw pumps are controlled by the burners of the heaters. The storage bin is refilled automatically from the large stock container by a suction unit / vacuum system with level sensor. If the stock level is too low the suction system will be stocking pellets with a pulsating movement. The suction system also drives the intake unit in the container, so the container is evenly and entirely emptied with a minimal amount of pellet dust.