District Heating System(DH) is one of the most excellent system in terms of energy saving and environmental protection. In order to comply with the global energy crisis and environment problem , it is necessary to research and develop the energy utilization technology with the reduction of the primary energy usage. Although the incresing rate of energy consumption started to attenuate , the entire growth in Korea. The energy demand in Korea increses by annual 3.7% during the period from 2000 to 2006. And it is expected that we should take a charge of the greenhouse gas reduction obligation by the Climatic Charge Convention(Kyoto Protocol) during the 2nd pledge period(2013~2017). This thesis reports something about comparisons between Braze & Gasket heat exchanger.