The Vitoflex 300-UF boiler is quality-constructed to handle the toughest of loads. The combustion chamber is lined with compressed firebricks with a high alumina content for added durability. All grate elements are made of durable cast chrome steel to withstand even the highest temperatures. The Vitoflex 300-UF boiler features a classic triple-pass heat exchanger design for maximum heat transfer and efficiency. It uses a burner trough with an attached external grate and a moving annealing grate to achieve optimal combustion results. Contact Viessmann for your next Biomass project at firstname.lastname@example.org.