The present invention relates to a small inverter electric boiler, and more preferably attached to the hot water discharge pipe simply using for supplying hot water to the heating and hot water pipes installed in existing, as well as feed water to supply the hot water in accordance with the instant temperature setting the temperature of the hot water in the water passing through a plurality of mounted hot water connection tube pipe between the water supply pipe and the hot water discharge pipe to be supplied at the same time as the body through the hot water outlet pipe and the heater is heated, the inverter mounted in the supply line, a circulation pump by controlling the flow of water while controlling the speed through the hot water pipe connection tubes it will always be supplied to the hot water produced by a set temperature.
It is arranged so that the inverter 30 for controlling the speed of the circulation pump 20, the circulation pump is connected to the 20 circulating pump (20) for mounted on the water supply pipe 10 for supplying water to circulate the water and, the water supply pipe 10 of the rear end side 11 and the hot water discharge pipe 40 of the leading end 41 to the plurality of connections attached but the heater insertion can be so formed hot water connection tube pipe 50 and the is inserted into one end of the hot water connected to the tube pipe 50 and the heater 60 for heating the water that is passed through to the hot water connection tube pipe 50, is attached to the hot water outlet pipe (40) to sense the temperature of the hot water is discharged including an outlet temperature sensor 70 for characterized in that the configured.