The anaerobic digester should at 38 C. Thus to satisfy cemperature needs, installation contains a boiler fuelled by the methane generated during the biomethanation. To calculate the heat required to maintain anaerobic digester at 38 C was the heat necessary to raise the temperature of wastes from 15 to 38 C was determined and then an addiyional 62% was added to factor in heat losses in the digester as well as an additional 5% to ensure adequate operating configuration. Finally to determine the thermal energy needed to generate the required heat , the calorific value of methane was determined to be 31 MJ/Nm3 although such value has been somewhere else reported to reach 35 MJ/Nm3 and the efficiency of the biogas boiler was estimated as 80%