The present invention relates to an atmospheric semi-blocking boiler, and the conventional boiler is an open air boiler to open the heating water and the atmosphere to use the atmospheric pressure, when the heating pipe is above the boiler position, it is difficult to circulate the heating water, the heating is made Therefore, when the water tank is built, the water tank should always be at a higher position than the heat exchanger position. Therefore, in the compact boiler, the area of the water tank occupies more than 의 of the boiler area.;In order to solve this problem, the present invention comprises a burner, a combustion chamber, a heat exchanger, and a back chassis having a blower fan at one side of the boiler body, and a gas pipe is connected to the burner so that fuel is supplied through a lower governor; One side of the governor is provided with a water flow sensor, an automatic make-up water valve, and a three-way valve, and a hot water heat exchanger is installed at the rear of the governor, wherein the three-way valve includes an automatic make-up water valve and a separate water-energy separator; In another flow passage is connected to each other and the boiler is a boiler including a water tank to the top of the separator to replenish the water in the heating pipe and to receive the volume expansion of the heating water,;The radiator separator is provided with a float installed in the upper part of the inlet pipe inside the body, and the valve seat is installed on the upper portion of the valve seat so as to be elastically supported by a spring. It is to provide an atmospheric semi-cutting boiler characterized in that.
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