Abstract Biomass energy refers to those forms of energy derived from plant or animal material, such as wood, straw, grass, and manure. The main partition of wood biomass material is the cellulose. Cellulose is defined as a polymer, or chain, of 6-carbon sugars; lignin is the substance, or “glue,” that holds the cellulose chain together. Biomass energy can be converted to fuel, serve as a feedstock for electricity and a building block for chemicals. The use of biomass energy has the potential to greatly reduce our greenhouse gas emissions. Biomass generates about the same amount of carbon dioxide as fossil fuels, but every time a new plant grows, carbon dioxide is actually removed from the atmosphere. The net emission of carbon dioxide will be zero as long as plants continue to be replenished for biomass energy purposes. Wood is a common and traditional biomass fuel used in areas with a sufficient wood supply like East Slovakia. Automated biomass systems can efficiently burn small-diameter wood that has no other potential use. They also provide a convenient way to use low-grade wood to heat buildings which are depend on not renewable energy heating systems especially with old installation equipment and low efficiency level. Biomass heating systems consist of a number of elements, including a heating plant, which typically includes an automated biomass combustion system and a peak load and back-up oil-fired heating system, heat distribution system, and a wood fuel supply operation. The appropriate choice usually depends on the heating load, the money available to invest in a biomass plant, and the financial viability of the specific option. Result of Delius pavilion heating system conversion is to economize of power costs and to contribute in energy sources conversion in renewable energies trend.