The lithium bromide absorption heat pump is a heat pump not driven by the conventional electricity, but by various heat sources such as natural gas, steam, flue gas, superheated hot water, based on the vacuum absorption technology. The absorption heat pump could produce high-grade heat (intermediate temperature and high temperature hot water) by recovering the heat from low-grade heat sources (such as cooling water, geothermal water, water from flue gas condensation, waste water from industrial process, etc.). The produced hot water could be used for various industrial processes and comfort heating, district heating. Generally, the lithium bromide absorption heat pumps could be classified into two categories. The 1st category absorption heat pump is able to recover the heat from low temperature heat source, and to produce hot water outlet temperature from 40~ 100°C. The 2nd category absorption heat pump is able to recover the heat from intermediate temperature heat source, and to produce superheated hot water outlet temperature from 100~ 170°C.