Abstract: An energy saving heat transfer unit providing an efficient means to transfer energy from steam to water in a central heating system. The steam enters a mixing chamber and creates a negative pressure environment. Water in a backwater pipe, which is at a lower temperature and pressure, is than is absorbed into the mixing chamber where energy is passed from the steam to the water. The heated water then exits the heat transfer unit and goes back into the heating system. After being cooled in the heating system, the water then reenters the heat transfer unit at the backwater pipe and continues the cycle over again.