For preventing global warming, reduction of environmental impact is becoming important in imaging equipments. In MFD (Multi-Function Devices), reduction of the Typical Electricity Consumption rate (TEC rate), which represents amount of power consumptions, is required. It is important to improve energy efficiency in a fuser that consumes about 70% of whole energy in a MFD, for which electrophotographic printing process is employed.The authors and his team developed a highly efficient fuser, for which new induction heating (IH) system is employed, by improving a conventional IH fusing technology.For optimizing magnetic energy generation and temperature field in the fuser, simulations for magnetic field and heat transfer are carried out. As a result, the new highly efficient IH fuser is developed. In this report, its capability and performance for energy saving with high productivity of the new IH fuser are also introduced.