Duplex heat exchangers provide efficient heat transfer with a small footprint. They are maintenance free, provide a long service lifetime and can withstand high temperatures and extremely high design pressures. They are used in a range of duties including cooling, heating, and evaporation and condensing. The duplex heat exchanger consumption volume was 10167 k units in 2016 and is expected to reach 10623 k units in 2017 and 12760 k units in 2021, growing at an annual growth rate of 5.54% from 2017 to 2021. Europe`s sales volume accounted for the highest market share (29.59%) in 2016, followed by the United States and China. At present, the manufactures of duplex heat exchanger are concentrated in China, Europe, and United States. Europe is the largest production area in the world, which occupied about 28.57% in 2016. The following areas are United States and China. Despite the presence of competition problems, due to the increasing demand of leading-edge, effective, and comfortable dental treatments, the growing adoption of evidence-based dentistry, investors are still optimistic about this area, investors are still optimistic about this area, the future will still have more new investment enter the field. In the next five years, the consumption volume will keep increasing, as well as the consumption value.