The use of heat pump steam generating units (HPSGU) for the utilization of low potential heat of marine internal combustion engines (ICE) is a promising direction for reducing pollution of the World Ocean. Studies have shown that HPSGU can effectively use the heat of water cooling the cylinders of low-speed marine engines and convert it into valuable energy, which increases the overall energy efficiency of ships and reduces pollutant emissions. Calculations have shown the feasibility of using heat pump units to generate water steam under a 0.3–0.5 MPa pressure. This is important for tankers operating in cold climate zones, as it allows the utilized heat to be used for various needs on board the vessel. In warm climate zones, HPSGU can be used to increase the efficiency of heat exchange systems that cool the air supplied to the ICE. The use of HPSGU can reduce emissions of toxic substances (SOx, NOx, CO2) by 1.8–2.5%. In cold zones, where heat pump systems can replace auxiliary boilers for heat generation, the reduction in emissions is 1.7–2.3%.