Biomass boilers are generally fired on wood products to produce heat, rather than gas, coal or oil. The biomass will be burnt to produce hot water which will be used to heat the J B Priestley library and Communal Building. As biomass varies in quality it is not easy to predict how much biomass we will need each year, but a rough estimate is 500 tonnes. 

http://www.bradford.ac.uk/ecoversity/resources/Ecoversity%20biomass%20boiler%20briefing%20note.pdf