This paper represents the effects of liquid/suction line heat exchanger in Steam Generation Heat Pump(SGHP) cycle. Because high DSH is necessary at basic SGHP cycle due to high compression ratio and characteristic of R245fa, basic SGHP cycle go through decrease of evaporator pressure, which result in performance degradation. This problems can be covered by applying internal heat exchanger at SGHP cycle, increasing the evaporator pressure and quality of refrigerant at evaporator inlet. By experiements with main variables of refrigerant charge, waste heat source temperature and DSH, heating capacity and COP are calculated and compared to basic SGHP cycle.