ABSTRACT: Afyon Ömer-Gecek is one of the important geothermal areas in Turkey, with lots of boreholes drilled by MTA and other organizations, These boreholes yield 4-100 l/s hot waterat 48-98 °C. AFJET` Corporation established by Afyon Private City Directory utilizes this hot water which has been obtaining from deep boreholes for the heating of the Afyon city.The short distance between the boreholes causes interference between the wells and thetempérature reduction. The hot water aquifer composed of Afyon metamorphics of Paleozoic age. The hoi water,is located in the cracks of this low permeable (k—W12 rmt) formation.. Within the scope of this study, it is aimed to conceptualize the hot water circulationsystem, to indicate the effects of the current exploitation activities on the aquifer systemby modeling the temperature and pressure distribution with the HST3D numerical model.,According the results derived from the model, the temperature and pressure around theboreholes decrease gradually in time. Due to the low permeability, the turnover of thesystem requires a long time., Therefore, new wells should be located far away from, theexisting wells and exploited with low rates in order to prevent temperature interferences..