The hydrothermal carbonization process is an effective thermal conversion of wet biomass to solid and liquid biofuels that avoids the drying of raw feedstock. The process takes place under heat and pressure in the presence of water which initiates a series of hydrolysis, condensation, decarboxylation, and dehydration reactions. A solid hydrothermal product known as hydrochar can be easily filtered from the hydrothermal slurry and usually exhibits an increased carbon content and a higher calorific value in comparison to feedstock. From the other hand, a separated process water might be successfully used as a feedstock for anaerobic digestion and expresses biomethane potential. In the present study, five types of biomass, agriculture digestate, corn and tomato silage, brewer's spent grain and sewage sludge, were investigated under a similar hydrothermal conditions: temperature 210 oC, pressure < 2,0 MPa and residence time 2 h. The process was conducted in a stainless steel, Zipperclave Stirred Reactor, 1000 ml of volume, equipped with a MagneDrive Agitator. The distribution of hydrothermal products was examined. The mass and energy yields of hydrochar was determined. To assess the combustion properties of hydrochar the following analyses were performed: the ultimate and proximate, higher heating values and thermal analysis. Moreover, on the basis of the thermal analysis, the key combustion temperature and indexes were determined. Moreover, the biomethane potential tests of process waters were conducted. The results confirmed that the hydrothermal carbonization process effectively converted wet biomass into biofuels.