A HEAT EXCHANGER FOR INSTANT ELECTRIC BOILER

A heat exchanger for an electric instantaneous boiler is provided to reduce temperature fluctuation and to stabilize flow of water by absorbing expanded amount of water with an expansion reducing unit, and keeping water heated by a heater within a hot water regulating unit before the water flows out through a heating water drain pipe. A heat exchanger(100) for an electric instantaneous boiler which allows heating water entered a heating water supply pipe(111) installed on a predetermined position of a lower side of a case(110) to be heated by a heater(120) vertically standing within the case and drained through a heating water drain pipe(112) installed on a predetermined position of an upper side of the case, the heat exchanger comprises an expansion reducing unit(130), a hot water regulating unit(140), a heating pipe unit(150), and a storage unit(160). The expansion reducing unit sealed within upper side of the case to absorb and reduce expanded amount of water when the water is expanded as its temperature increases. The hot water regulating unit is installed on the upper side of the casing to reduce fluctuation of water temperature by keeping the water heated by the heater before the water is drained through the heating water drain pipe. The heating pipe unit communicated with an upper side of the hot water regulating unit, partially surrounds the heater so as to heat up water flowing therethrough. The storage unit installed on a lower side of the expansion reducing unit having communication therebetween, stores water entered the case to be heated and stabilizes the flow of water.